巻号一覧
29 巻, 3 号
選択された号の論文の24件中1～24を表示しています
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牧野 昇, 木村 康夫, 鈴木 正樹1965 年 29 巻 3 号 p. 205-210
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーThe effect of the simultaneous addition of Ag, Sn and Bi, totaing 4 wt%, on thermoelectric properties of a ZnSb alloy containing 47 to 54 at%Zn has been studied. ZnSb containing 53 to 54 at%Zn gives a good result. The highest value of the figure of merit Z, 1.34×10−3°K−1, was obtained with the specimen containing 54 at%Zn in the base alloy and with additional elements, 2 wt%Ag, 1 wt%Sn and 1 wt%Bi. Also the specimen, 53 at%Zn in the base alloy and 2 wt%Ag and 2 wt%Sn added, has a Z value of almost the same as that of the above mentioned specimen. An approximate relation, σ=4000×exp(−0.016α), is found between α and σ of the alloys, but several specimens show a more favorable combination of α and σ. From this relation, it is expected that alloys having α of about 125 μV/°C will have a higher Z value, and in fact, this has been confirmed. However, the specimen having the α value of 174 μV/°C has also a very high Z value, in agreement with Ioffe’s theoretical prediction. According to our experimental data, the KL of ZnSb compound is estimated to be about 0.012 W °C−1 cm−1, but KL seems to be reduced to about one half by the (Ag, Sn, Bi)-addition. Within the temperature range from room temperature up to 350°C, α increases with increasing temperature, while σ decreases. Combining these measured temperature variations of α and σ with presumed that of K, Z is expected to rise slowly with temperature and to exhibit the highest value between 200° and 300°C.
The process for preparing the ZnSb specimen by sintering has also been studied. Sintering is most satisfactorily carried out at the temperature of 25° to 30°C below the melting point of the alloy. The specimens thus prepared process the Z values equal to or even higher than those of specimens of the same composition and prepared by melting, quenching and annealing.抄録全体を表示PDF形式でダウンロード (1082K) -
吉岡 正三, 中山 豊, 武田 正明1965 年 29 巻 3 号 p. 211-216
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーThe distribution and behaviour of dislocations in polycrystalline molybdenum after tensile deformation at −78°C were studied by means of transmission electron microscopy. In the early stage of plastic deformation, grain boundaries play an important role as a dislocation source. It seems that the sharp yield drop in polycrystalline molybdenum is a result of the rapid dislocation multiplication by the double cross slip mechanism . No piled-up groups of dislocations against the grain boundaries were observed at the lower yield point. The average dislocation density increases with the amount of strain. At −78°C from the lower yield point to about 5.5% strain, the tendency for the formation of dislocation tangles lessens and the distribution of dislocations seems to be uniform, and beyond about 5.5% strain the formation of dislocation tangles seems to become somewhat clearer. The distribution of dislocation loops appears to be uniform.
In the case of polycrystalline molybdenum having an average grain size 30 μ and strained by a initial strain rate 1.7×10−4 sec−1 at −78°C, the behaviour of work-hardening is divided into two stages: one is the linear hardening stage and the other is the parabolic hardening one.抄録全体を表示PDF形式でダウンロード (2024K) -
増本 量, 小林 猛郎, 渡辺 清1965 年 29 巻 3 号 p. 217-222
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーThree years ago, the present investigators found a new magnet alloy “Malcolloy” having a high coercive force and determined the influence of the addition of nickel on their properties, the highest coercive force obtained being 1500 Oe. Further, they have investigated the influence of the addition of molybdenum on the properties of Co-Al alloys and discovered that the coercive force of Co-Al alloys is increased generally by the addition of molybdenum. An alloy containing 80.51%Co, 13.96%Al and 5.53%Mo shows the coercive force of 1600 Oe, the residual magnetic flux density of 2750 G and the maximum energy product of 1.34×106 G·Oe, when tempered at 600°C for 20 hours after water-quenching from 1380°C. These alloys consist of many ferromagnetic elongated particles of about 400 Å in mean diameter which are dispersed in the matrix of almost non-magnetic β phase. Consequently, it may be concluded that the high coercivity of these alloys is mainly caused by the existence of the small particles, each of them being composed of a single magnetic domain.抄録全体を表示PDF形式でダウンロード (1318K) -
増本 量, 小林 猛郎, 渡辺 清1965 年 29 巻 3 号 p. 222-227
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーThe present investigators previously found a new magnet alloy “Malcolloy” having a high coercive force in the system of cobalt and aluminum and then conducted studies on the influence of the addition of nickel and molybdenum on their magnetic properties, the highest coercive force obtained being 1600 Oe.
They have now investigated the influence of the addition of titanium on magnetic properties of Co-Al alloys and have found that the coercive force is increased generally by the addition of titanium. Thus, an alloy with the composition of 80.53%Co, 14.84%Al and 4.63%Ti showing a coercive force of 1550 Oe, a residual magnetic flux density of 2850 G, and a maximum energy product of 1.40×106 G·Oe, when tempered at 550°C for 20 hours after water-quenching from 1365°C.
These alloys consist of many elongated-small particles of a ferromagnetic phase dispersed in the matrix of non-magnetic one. Consequently it may be concluded that the in high coercivity is mainly caused by the existence of small particles, each of which is composed of a single magnetic domain.抄録全体を表示PDF形式でダウンロード (1810K) -
増本 量, 小林 猛郎, 村上 雄悦1965 年 29 巻 3 号 p. 228-231
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーThe magnetic properties of ferromagnetic Ni-Mn alloys containing less than 35.56% manganese have been measured at room temperature, after cooling at various rates from 900°C, with ring-form specimens punched from thin plates, and the relation between the magnetic permeability and order-disorder transformation of Ni3Mn (23.78 wt%Mn) has been investigated. It has been found that the initial and maximum permeabilities become larger as the cooling rate becomes smaller; the former shows only one maximum against the composition, and the latter two. An alloy containing 21.80% manganese has the best properties when cooled at the rate of 5°C/hr from 900°C; the initial permeability is 5090, the maximum permeability 12490, the magnetic hysteresis loss 18.5 erg/cm3/cycle (Bmax=2000 G), the coercive force 0.027 Oe (Bmax=2000 G), and the specific electric resistance 60.5 μΩ cm at 20°C. This alloy can be forged and rolled more easily than permalloys and has been named “Nimalloy” which is an abbreviation of Ni-Mn alloys.抄録全体を表示PDF形式でダウンロード (1032K) -
佐々木 悦男, 小野田 博, 矢野 幸三1965 年 29 巻 3 号 p. 232-236
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーThe fundamental values of casting shrinkages of ZAC#1, ZAC#2 and pure zinc on die casting were measured with a specially devised die which was made of Invar (Fig. 1). The results are as follows: (1) When there was nothing to prevent a thermal shrinkage of casting like insert cores, the casting shrinkages of ZAC#1, ZAC#2 and pure zinc were 1.03∼1.15%, 1.05∼1.12% and 1.15∼1.19%, respectively. (2) The casting pressure, casting temperature and die temperature have complicated effects on the fundamental values of casting shrinkages. (3) The casting flash has an effect of decreasing the casting shrinkages.抄録全体を表示PDF形式でダウンロード (1309K) -
戸田 忠俊1965 年 29 巻 3 号 p. 237-242
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーIt is shown that certain high strength and high electrical conductivity copper alloys, Cu-Cr and Cu-Be, do not undergo sufficient age-hardening by slow quenching. This problem has been recently highlighted by the increasing demand for high strength alloys in the form of a large section. In order to find out the effect of the cooling rate on the formation of a supersaturated solid solution for Cu-Cr and Cu-Be alloys, the Jominy end quench tests and the isothermal treatment and ageing tests were performed. A 25φ×100 mm test bar similar to the standard bar for steel was used for the Jominy tests and the 1.0 mmφ wire for the isothermal treatment and ageing tests to determine the C curve.
The results obtained are as follows. (1) Cu-0.68%Cr alloy. It was found by the Jominy tests that the supersaturated solid solution of this alloy was obtained at room temperature, when the cooling rates (at 1050°∼800°C) were faster than 10°C/sec at 1000°C and 17°C/sec at 900°C. The nose of the C curve was observed at 900°∼950°C. It may be concluded that the critical cooling rate of this alloy on solution treatment is 17°∼20°C/sec at 900°∼950°C. (2) Cu-2.46%Be-0.23%Co alloy. It was found by the Jominy tests that the Cu-Be alloy could be age-hardened satisfactorily, when the cooling rates from 800°C were faster than 55°C/sec (at 800°∼500°C). The upper C curve was obtained at about 700°C, higher than the β-phase eutectoid temperature, and the critical cooling rate at which the cooling curve did not intersect with the upper C curve was relatively low (about 3°C/sec). The lower C curve was obtained at about 500°C lower than the eutectoid temperature, and the critical cooling rate was as high as 60°C/sec. The ageing characteristics were particularly influenced by the cooling rate in the temperature range near the nose of the lower C curve. It is concluded that the critical cooling rate on solution treatment of this alloy is 55°∼60°C/sec at about 500°C.抄録全体を表示PDF形式でダウンロード (1726K) -
財満 鎮雄, 加茂 進, 佐藤 宇昭1965 年 29 巻 3 号 p. 243-248
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーFollowing the previous report on the electric discharge drilling of berylium bronze, the electric discharge cutting of berylium bronze has been experimented. The results show that the electric discharge cutting machinability of berylium bronze makes no great difference from that of brass and is better than the mild steel notwithstanding its high hardness and tensile strength. The cutting efficiency increases in a saturation-curve with the revolution speed of the electrode disk plate, and the optimum cutting condition depends on the machining electric current or the machining solution (in this experiment, the machining electric current; 3 A and the solution; machine oil). The cutting machinability of berylium bronze is affected slightly by the change in the structure or mechanical properties by a treatment. The narrow slit can easily be cut by using the thin electrode disk plate. Therefore, the electric discharge cutting seems to be a most useful method for the cutting of berylium bronze.抄録全体を表示PDF形式でダウンロード (931K) -
前川 立夫, 中島 宣雄, 香川 優1965 年 29 巻 3 号 p. 248-252
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーAnodic polarization behaviors of AISI Type 304 and 304L stainless steels in deaerated sulfuric acid solution were studied as the function of the cold-working degree, ferrite content and surface finish by means of a potentiostat. The results may be summarized as follows: (1) When the ferrite phase was produced by cold working, a significant effect of the ferrite phase on the current density was observed in the active region, and the critical current density increased approximately in proportion to the ferrite content. However, in passive and transpassive regions, no effect of the ferrite phase was observed. (2) When no ferrite was produced, the anodic behaviors seemed unaffected by cold-working. (3) Anodic behaviors of the annealed stainless steel which has the property to produce the ferrite phase by cold-working were significantly affected by abrading of the surface.抄録全体を表示PDF形式でダウンロード (763K) -
前川 立夫, 永田 定義, 中島 宣雄, 香川 優1965 年 29 巻 3 号 p. 252-257
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーThe potentiostatic etching technique for austenitic stainless steels was studied to observe the variation of the structure by cold-rolling. The etching potentials of each phase (ferrite, austenite and grain boundary) were determined from the etching figures of an annealed AISI 321L stainless steel. 1 N H2SO4 (containing 0.01 g/L NH4SCN) and conc HNO3 solutions were selected as etching solutions. The ferrite phase caused by cold-working was etched at a potential of −0.35 V (vs S.C.E.) in H2SO4, and the distribution of ferrite phase was observed by an electron microscope. The slipping band was etched at −0.2 V, the etching potential of austenite phase. The grain boundary was etched at 1.2 V in conc HNO3, and the deformation of the grain by rolling was observed.抄録全体を表示PDF形式でダウンロード (1254K) -
前川 立夫, 中島 宣雄, 香川 優1965 年 29 巻 3 号 p. 257-262
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーThe effect of cold-working, heat treatment and solution temperature on anodic behaviors of austenitic stainless steels of AISI Type 304 and 304L were studied in 1 N H2SO4 solutions containing various concentrations of chloride. With the increasing concentration of chloride ion, the critical current peak of both steels increased, and one more peak appeared in the potential range of −0.18∼−0.14 V (vs S.C.E.) in the Type 304 stainless steel. This peak increased by sensitization heat treatment and decreased by cold-working. The cold-working and ferrite precipitation by cold-working did not affect the critical potential of pitting formation, but the sensitization treatment at 675°C for 1 hr decreased the pitting potential of the Type 304 stainless steel. The breakaway rate of the passive film by pitting formation increased by cold-working.抄録全体を表示PDF形式でダウンロード (1507K) -
竹内 栄, 渡辺 治1965 年 29 巻 3 号 p. 263-266
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーThe crude titanium which was produced by both electrolytic reduction and carbon arc reduction of titanium oxide was purified in a fused salt bath of alkali halide by the electro-refinning method, and the mechanical properties of titanium was measured. It was found that the contents of carbon and oxygen were less than 0.03% for the electro-refined titanium obtained by the electrolytic reduction method, and the contents of Fe, Si, Al and Mn decreased compared with those in the raw crude titanium. The titanium electro-refined by the carbon arc method was higher in purity than that of the special grade sponge titanium, and its mechanical properties were superior to those of the sponge titanium by the Kroll method, with the same excellent qualities as the Iodide titanium.抄録全体を表示PDF形式でダウンロード (1127K) -
黒沢 利夫, 長谷川 良祐, 柳橋 哲夫1965 年 29 巻 3 号 p. 267-271
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーThe heat capacity of SiI4 used as a source material in the iodide process of silicon was measured by means of an adiabatic calorimeter available for continuous measurement. The heat capacities of solid and liquid SiI4 obtained were Cp=19.64+0.0208T cal/mol·deg and Cp=34.62+0.0112T cal/mol·deg, respectively.
The melting point of SiI4 was 120.5°C. The heat of fusion and the entropy of fusion were 4.70 kcal/mol and 11.9 cal/mol·deg, respectively.
Heat contents, the free energy function of SiI4 and the standard entropy of S298=43.7 cal/mol·deg were derived from the experimental values and thermochemical data. Moreover, the heat capacities of pure Cr, fused quartz and high purity Si were also measured, the values of which were in good agreement with the previous literature.抄録全体を表示PDF形式でダウンロード (1131K) -
五弓 勇雄, 木原 諄二1965 年 29 巻 3 号 p. 271-276
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーIt is observed how the deformation resistance and work hardening behavior of tough-pitch copper and 0.02% carbon steel, are influenced by the deformation speed. The order of magnitude of the deformation speed is 10−3/sec (by the Olsen material tester), 102/sec (the counter-blow forging tester) and 104/sec (with the high speed deformer made of “Drive’it rivetting machine”) as the strain rate. In the case of copper strain-rate dependence of deformation resistance is smaller than in that of iron. However, the work hardning behavior of copper depends upon the strain rate, but that of iron does not depend on the strain rate at all except when deformation goes with twin deformation. Therefore, the strain-rate dependence of deformation resistance of copper is due to that of work hardning behavior, but in the case of iron the strain-rate dependence of deformation resistance is due to that of frictional resistance in the crystal itself.抄録全体を表示PDF形式でダウンロード (764K) -
大山 致知, 池田 圭介, 和泉 修1965 年 29 巻 3 号 p. 277-282
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーThe behaviours of extrusion by the high-energy-rate metal forming machine, Dynapak Model 600 (ram velocity: 13 m/s) were investigated, and compared with those by the 500 t hydraulic press of slow extrusion speed (about 0.6 mm/s).
The results obtained are as follows:
(1) The hardness distribution along the rod extruded by Dynapak changes remarkably from the front to the back end, and sometimes partial recrystallization occurs.
(2) Softening due to heat-treatment begins at a lower temperature in the rods extruded by Dynapak than in those by the hydraulic press.
(3) The texture differences are scarcely observable between the inner and the outer zones of the rod extruded by Dynapak, in which, however, the ⟨100⟩ component of the double texture of ⟨111⟩+⟨100⟩ is slightly stronger, compared with that of the slow speed extrusion.抄録全体を表示PDF形式でダウンロード (1343K) -
1965 年 29 巻 3 号 p. 282a
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーPlease see pdf. Wrong:70 kg (apper), 200 kg (lower), t (min) Right:200 kg (upper) 70 kg (lower), [Please see pdf]抄録全体を表示PDF形式でダウンロード (20K) -
1965 年 29 巻 3 号 p. 282b
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーPlease see pdf. Wrong:[Please see pdf], Dynapak 550°, 500°C, Right:[Please see pdf], Dynapak 550°, 400°C,抄録全体を表示PDF形式でダウンロード (20K) -
福家 好太良, 中村 勲1965 年 29 巻 3 号 p. 283-286
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーAn examination was conducted of the conditions needed for the photometric determination by extracting and isolating Ce and Mn contained in metallic nickel by use of TBP (Tri-N-butyl-phosphate).
Ce in metallic nickel could be completely extracted and isolated by repeating the process of extraction and isolation twice by using TBP from the 8 N HNO3 solution containing 5 mL, 2 M NaBrO3 solution and 10 mL HClO4.
By back-extracting this extraction phase by the 8 N HNO3 solution containing 3% H2O2, the photometric determination of Ce could be successfully carried out at 320 mμ by the AgNO3-K2S2O8 method, while, similarly, the photometric determination of Mn could be undertaken at 530 mμ from the residual extraction solution by the AgNO3-(NH4)2S2O8 method.
The range of determination of Ce by this method was 0.01∼0.30%, and such coexisting elements as Fe and Si, in metallic nickel were not generally seen to exert any influence.抄録全体を表示PDF形式でダウンロード (488K) -
一ノ瀬 幸雄1965 年 29 巻 3 号 p. 287-293
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーMagnetic properties of Fe-Ni alloys are spoiled by various imperfections, particularly by the presence of non-metallic inclusions. These non-metallic inclusions could not completely be removed out by usual vacuum melting and, therefore, some refining reagents should be added. The properties required for those refining reagents are as follows:—(1) These reagents have a stronger affinity for oxygen than Fe or Ni, (2) The oxides of these reagents have a very high vapor pressure (gaseous oxides), (3) The excess of refining reagents retained in the melt would not form the second phase such as compounds, but would dissolve in matrix as a solid solution and improve magnetic properties. Ge, one of IV B elements of the periodic chart, is thought to form the thermodynamically stable gaseous oxide, and it was therefore theoretically studied on the refining effect of Ge on the vacuum melting of Fe-Ni alloys. The results obtained are as follows:—
(1) Ge forms the stable gaseous GeO over 1000°C and its oxide has a very high vapor pressure of 106∼107 mmHg near 1600°C. Therefore, under the condition of vacuum melting, the following reaction
(This article is not displayable. Please see full text pdf.)
proceeds to the right hand side, and thereby the refining effect becomes remarkably higher.
(2) Theoretically calculating the equilibrium oxygen content of pure Fe, 50%Ni-Fe, 80%Ni-Fe and pure Ni as examples of practical magnetic materials, the addition of a small amounts of Ge in those melts remarkably lowers the oxygen content to a few ppm or below under the condition of 10−3 mmHg and 1600°C.抄録全体を表示PDF形式でダウンロード (1751K) -
一ノ瀬 幸雄1965 年 29 巻 3 号 p. 294-301
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーBy the previous thermodynamical study, it has been shown that Ge might be ideal as the refining reagent for the vacuum melting of Fe, Ni and their alloys, and that Ge might effectively decrease the dissolving gases in the melt without leaving non-metallic inclusions within the ingot. In the present study the effect of Ge additions on the dissolving gases and the distribution of non-metallic inclusions were investigated experimentally , in the wide range of the Fe-Ni binary system vacuum melted in the scale of laboratory and semi-industry, by means of the vacuum fusion gas analysis and the electron microscope. The results obtained are summarized as follows:—
(1) The addition of Ge astonishingly decreases the dissolving gases, such as oxygen and nitrogen. The oxygen content is rapidly decreased from a few hundreds ppm to 10∼20 ppm by the addition of only a few per cent Ge. The refining ability of Ge is more effective in the melting on the industrial scale in a poorer vacuum condition. For example, in the large ingot of 20 kg, the oxygen content of the ingot with Ge is about 10 ppm, that without Ge being 200 ppm.
(2) It is found to have close correlation between the dissolving oxygen content and the amount of non-metallic inclusions, i.e., as the former becomes lower, the latter also decreases. The diameter of the most of the non-metallic inclusions is found to be about 1 μ.抄録全体を表示PDF形式でダウンロード (2574K) -
一ノ瀬 幸雄1965 年 29 巻 3 号 p. 301-306
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーIt is theoretically and experimentally shown that Ge has an excellent refining effect on the vacuum melting of Fe-Ni alloys. Therefore, it is presumed that the grains of Fe-Ni alloys containing a few %Ge are generally easy to grow and the alloys have superior magnetic properties, because of the decrease in the gas content and non-metallic inclusions. From the above standpoint, the author has studied how the grains and the magnetic properties of Fe-Ni alloys containing Ge change during the recrystallization treatment. The results obtained are as follows:
(1) The addition of Ge promotes remarkably the grain growth, which is particularly effective by the initial addition of only a few %Ge. The reason is that the non-metallic inclusions are removed out by the refining action of Ge.
(2) The addition of Ge induces a substantial decrease in the coercive force, resulting in improvement of the magnetic properties. The effect is also remarkable by the addition of only a few %Ge.
(3) The activation energy for the grain growth is calculated to be about 20000 cal/mol in all of Fe-Ni alloys. This value is relatively small and is close to that of the diffusion of atoms along the grain boundaries. On the other hand, the frqeuency factor in Fe-Ni alloys containing Ge is the largest, the easy grain growth of which is due to their large frequency factor value.抄録全体を表示PDF形式でダウンロード (937K) -
津田 尚克1965 年 29 巻 3 号 p. 307-311
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーLead is known to show a fatigue resistance in air much less than in vacuum, since it recrystallizes at room temperature. The another has made an optical-microscopic study on how the fatigue progresses in pure lead in air and how the structure of the metal changes.
As test samples, 99.998% pure lead was melted, cast, and extruded into 3.5 mm-thick plates. The samples were tested on a cantilever up- and -down-swing fatigue tester with the strain amplitude of 0.075% and at the speed of 600 c.p.m. Before the test, they vere polished chemically and etched for examination of their microstructures. The samples were subjected to 5,000 to 170,000 cycles of swing, and, on the way of the fatigue test, they were frequently inspected microscopically.
The observational results may be summalized as follows: Grain reveals slip band and a grain boundary migration occures. The latter is not a simple parallel migration of the grain boundary before fatigue, but shows a more complicated aspect, appearing as a black belt. This may be considered to be caused from the fact that the fatigue progresses while its grain boundary changes as influenced by oxygen air. This idea has been ascertained from the manner in which a grain boundary is corroded by chemical polishing and etching after fatigue. The depth of corroded furrows increased with the swing cycle. Thus, the fatigue is continued in this way, the strength of the grain boundary is decreased and cracks are developed, finally reaching the failure.抄録全体を表示PDF形式でダウンロード (1395K) -
美馬 源次郎, 山口 正治1965 年 29 巻 3 号 p. 312-317
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーChanges in the microstructure during cold drawing and at various stages of the isothermal softening process of a highly cold drawn aluminium-2 wt% magnesium alloy have been studied by a transmission electron microscopy and X-ray measurements.
Nearly parallel narrow segments, began to occur with the deformation, which appear to be a basic characteristic of the microstructure during cold drawing and are named the “Narrow band”.
The structure of the narrow bands is closely related to the ⟨111⟩ preferred orientation resulting from cold drawing.
In the steps proceeding the primary recrystallization, the density of dislocations decreases slowly and gradually, and the formation of sub-grains begins, and a well-defined substructure is developed chiefly by the coalescence of sub-grains in the narrow bands during isothermal annealing.
The present experiment indicates that the coalescence of sub-grains leads to the formation of recrystallization nuclei in the early stage of primary recrystallization.抄録全体を表示PDF形式でダウンロード (2037K) -
木村 康夫, 阿部 秀夫1965 年 29 巻 3 号 p. 318-320
発行日: 1965年
公開日: 2008/04/04
ジャーナル フリーAn Alnico-8 magnet alloy was prepared by melting in vacuum. The ingots were reduced to 60∼70% in thickness by rolling at temperature between 1200° and 1000°C. The final thickness was approximately 10 mm. The rolling texture was found to contain three components; (100)[011], (112)[1\bar10] and (111)[11\bar2] orientations. This texture is almost the same as that in the cold low carbon steel. This suggests that the slip direction of the Alnico alloy is ⟨111⟩ axis. On heating above 1225°C, recrystallization took place in the rolled Alnico alloy. The recrystallization texture consists of three components; the (100)[011] and (112)[1\bar10] components scattered by rotation around the normal to the rolling plane and the (111)[11\bar2] component. A remarkable grain growth was observed on heating at 1300°C.抄録全体を表示PDF形式でダウンロード (436K)
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