巻号一覧
47 巻, 6 号
選択された号の論文の14件中1～14を表示しています
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福富 洋志, 堀内 良1983 年 47 巻 6 号 p. 457-461
発行日: 1983年
公開日: 2008/04/04
ジャーナル フリーGrain boundary sliding parallel or normal to the ⟨111⟩ tilt axis was investigated for symmetric tilt boundaries in aluminum.
The rate of grain boundary sliding parallel to ⟨111⟩ was smaller than that normal to ⟨111⟩. This difference in the rate of grain boundary sliding coincided with the model proposed by McLean. The orientation dependence of the grain boundary sliding rate, however, could not be explained by his model.
Unusual decrease in the sliding rate was found on the Σ7 coincidence boundary.抄録全体を表示PDF形式でダウンロード (786K) -
長村 光造, 奥田 浩司1983 年 47 巻 6 号 p. 462-470
発行日: 1983年
公開日: 2008/04/04
ジャーナル フリーSmall-angle X-ray scattering intensity was measured for several Al-Zn alloys aged for 60 ks at various temperatures between 293 and 393 K. Scattering intensities were found to obey a scaling rule, when the alloys with the same chemical composition were aged at different temperatures. Under the present ageing conditions, GP zones had the average radius between 1 and 2 nm, and their average nearest neighbour distance among zones lay in the range between 10 and 25 nm. Both of the size and the distance among zones were minimized at the ageing temperature around 350 K in the binary Al-Zn alloys, and they became smaller and shorter with decreasing temperature in the alloys containing by 0.1 at%Mg. The dependence of the imhomogeneous structure containing GP zones on the alloy composition and ageing temperature could be qualitatively explained in terms of diffusivity of solute atoms and coherency strain around zones. The present study established a universal method for the small-angle scattering intensity analysis to obtain the knowledge on the spatial distribution as well as the volume fraction and the size distribution of GP zones.抄録全体を表示PDF形式でダウンロード (1269K) -
村上 勇一郎, 可知 祐次, 中西 典彦1983 年 47 巻 6 号 p. 470-475
発行日: 1983年
公開日: 2008/04/04
ジャーナル フリーThe microstructures of β AgxCu55−xZn45 alloys were studied by X-ray diffraction and electron microscopy. In the alloys with x=15, 20 and 25 at% compositions quenched from 823 K, the modulated structures and the existence of fine precipitates with fcc structure (α phase) were observed; the modulation occurred along the ⟨100⟩bcc directions. The averaged diameter of fine precipitates was determined from the half breadth of the 111fcc X-ray diffraction line and found to be about 6 nm in a quenched specimen. During the aging at temperatures, 533, 513 and 493 K, the averaged diameter of α precipitates (fcc) was found to be increased, i.e. the coarsening of precipitates was observed. The apparent activation energy for the coarsening of α precipitates was found to be 142, 126 and 98 kJ/mol in alloys with x=15, 20 and 25 at% compositions, respectively. The formation of α precipitates and modulated structures even in a quenched specimen was expected to have a close relation to the phase separation of β phase at high temperature.抄録全体を表示PDF形式でダウンロード (1031K) -
杉山 昌章, 大嶋 隆一郎, 藤田 英一1983 年 47 巻 6 号 p. 476-483
発行日: 1983年
公開日: 2008/04/04
ジャーナル フリーThe microstructure and growth characteristics of an amorphous Co70Fe5Si12.5B12.5 alloy in the crystallization process were studied by transmission electron microscopy and X-ray diffraction. Ribbon samples made by the single roller liquid quenching were annealed for various periods at temperatures ranging from 500 to 900°C. They were called the bulk specimens. An in-situ annealing experiment in a transmission electron microscope was also carried out by using the specimens thinned by electropolishing, which were called the thin film specimens. The crystallization processes in both types of specimens were the same, but in the thin film specimens crystallization started at a temperature 150 degrees lower than that in the bulk ones.
In the early stages of crystallization, the electron microscope observation revealed that small spherical crystals appeared dispersedly. In the isothermal annealing of the bulk specimen at 500°C and of the thin film specimen at 400°C, their growth rate gradually slowed down and no further nucleation occurred. Though these characteristics exactly corresponded to those of the so-called metastable phase I (MSI), their structure was not a single phase but of a eutectoid. Each crystal consisted of fine crystallites of ε-Co and Co2Si connected together. No remarkable composition change of the amorphous matrix suggested that the slow down of the growth rate of the crystals was caused by the accumulation of unnecessary atoms, boron and iron, near the boundaries.
In the later stages of crystallization, the primary crystals rapidly grew, and the residual amorphous matrix became thoroughly covered with the crystallites. A new phase, Co2B, also appeared in this stage, which was follwed by the emergence of fcc Co-5 at%Fe solid solution as a result of the diffusion of iron atoms and the ε→α transformation in ε-Co. The final stable phases were Co-Fe solid solution, Co2Si and CoB2.抄録全体を表示PDF形式でダウンロード (3004K) -
阿部 秀夫, 鈴木 竹四, 飛松 憲太郎1983 年 47 巻 6 号 p. 484-490
発行日: 1983年
公開日: 2008/04/04
ジャーナル フリーFor a low-carbon aluminium-killed steel quenched from the solution temperature (973 K) and preliminarily aged at 308 K for 73200 s or 106 s, the reversion and subsequent age-hardening at 348 K, 373 K, 423 K and 448 K are traced by displacement of the data-points on the thermoelectric power vs. electrical conductivity plots. The reversion is represented by reverse displacement of the data-point to the as-quenched state. This indicates that the coherency strain generated by the preageing at 308 K is maintained during the reversion. It is further speculated that the coherency strain induced by the succeeding precipitation of epsilon carbide is nearly the same in magnitude as that in the case of direct ageing at the same temperature. During the growth of epsilon carbide particles, the coherency strain declines gradually.抄録全体を表示PDF形式でダウンロード (1493K) -
中村 博昭, 郡司 好喜1983 年 47 巻 6 号 p. 490-494
発行日: 1983年
公開日: 2008/04/04
ジャーナル フリーYttrium sulfide disks have been carefully prepared by means of a newly developed sintering method to avoid any contamination. The electrical conductivity has been measured at temperatures from 973 K to 1223 K and in the PH2S/PH2 range from 10−4 to 102 with the aid of an alternating current (1 kHz) bridge. It has been concluded that yttrium sulfide is a pure electronic conductor under the above-mentioned conditions. The specific conductivity is expressed as follows:
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The observed sulfur pressure dependence is attributed to the predominance of fully ionized yttrium interstitials and fully ionized yttrium vacancies.抄録全体を表示PDF形式でダウンロード (538K) -
木内 清, 近藤 達男1983 年 47 巻 6 号 p. 494-501
発行日: 1983年
公開日: 2008/04/04
ジャーナル フリーMolybdenum has a high reactivity with oxygen and forms the volatile oxide species i.e. (MoO3)n even under lower oxidizing conditions. It is an important problem as a synergistic effect of the chemical sputtering and the sublimation reaction. The present paper characterizes the effect of the oxidation on the sputtering of unalloyed molybdenum bombarded with A+ primary ions. SIMS was used to study the sputtering behaviors for thermally grown molybdenum oxide films bombarded with 2 keV A+.
Mo and MoO2 showed the essential behavior assumed by the physical sputtering. However, MoO3 showed the apparently chemical sputtering with two types of the secondary ion yield which depend on the density of the primary ion and sputtering time. One corresponds to the secondary ion yield originated from the covering layer of [(MoO3)n]ad.. The other corresponds to the secondary ion yield from the MoO3 solid surface. The secondary ion yield from [(MoO3)n]ad. is approximately twenty times as large as that from the bulk of MoO3. These dependence on the secondary ion yield are controlled by the primary ion density and sputtering time as a function of the thermodynamical reaction rate of n MoO3(Solid)\ ightleftharpoons[(MoO3)n]ad.\ ightleftharpoons(MoO3)n(Gas).抄録全体を表示PDF形式でダウンロード (1069K) -
金児 紘征, 泰松 斉1983 年 47 巻 6 号 p. 501-506
発行日: 1983年
公開日: 2008/04/04
ジャーナル フリーAn apparatus for measuring the potential distribution on a flat specimen immersed in an electrolyte was designed and connected with a micro-computer to systematize the measuring method: A potential sensor controlled by the micro-computer scans a plane close to and parallel with the specimen surface, and the sensor positions and measured potentials are set on-line to the input of the micro-computer to display potential maps on a CRT display.
Three kinds of displays of the potential distribution on copper-zinc galvanic corrosion systems were presented. The three-dimensional display and the shading display are suitable for monitoring the potential distribution. An equipotential contour map obtained by the computer analysis is suitable for analysing quantitatively the potential distribution. The measuring system was also applied to the investigation of the corrosion of an aluminum. Potential maps varied with time, corresponding well to the initiation and growth of pits.
Therefore, the measuring system developed in this study is very useful for the survey of the electrochemical inhomogenuity on a specimen and can be widely applicable to corrosion studies.抄録全体を表示PDF形式でダウンロード (2293K) -
広川 吉之助, 高田 九二雄1983 年 47 巻 6 号 p. 507-509
発行日: 1983年
公開日: 2008/04/04
ジャーナル フリーA low voltage spark discharge has been investigated as an aerosol generator of metal samples for ICP emission spectrometry. Fine particles of aluminum alloys could be produced by low voltage spark discharge in argon atmosphere, and more intense specral lines could be observed by introduction of the aerosol into the ICP plasma, compared with low voltage spark excitaition. A calibration curve of high silicon concentration, which was difficult to dissolve into solution, was obtained when a series of reference samples were available.抄録全体を表示PDF形式でダウンロード (703K) -
増本 量, 菊地 紀雄, 中山 孝文1983 年 47 巻 6 号 p. 510-515
発行日: 1983年
公開日: 2008/04/04
ジャーナル フリーYoung’s modulus, thermal expansion and magnetization at 120-700 K and crystal structure at room temperature were investigated for annealed Mn-Ge-Fe alloys with various crystal structures such as β+γ, γ+ε and ε phases. Young’s modulus vs temperature curves of the ternary alloys consisting of β+γ and of γ phase show a reversible change at a heating and cooling rate of about 27.8×10−3 K/s, and have distinct minimum and maximum corresponding to the Néel point of γ phase TN(γ) and β\ ightleftarrowsγ reversible transformation point Tt below about 10 at%Fe, and the alloys containing Fe above the same amount show only TN(γ). The Elinvar characteristics appears around the temperatures which correspond to a minimum or a maximum of Young’s modulus vs temperature curves. However, Young’s modulus of ternary alloys consisting of γ+ε and of ε phases shows minimum point at TN(ε) or TN(γ), and the Elinvar characteristics around these temperatures is weakened rapidly with increasing Fe content.
The composition range with about zero or −20×10−5 of the temperature coefficient of Young’s modulus is relatively narrow and extends to the composition of Fe-70 at%Mn. This composition area has no relation to that of Fe-Mn-Ge ternary alloys reported previously.抄録全体を表示PDF形式でダウンロード (779K) -
瀬川 赳夫, 佐藤 鉄男, 木村 康夫1983 年 47 巻 6 号 p. 515-520
発行日: 1983年
公開日: 2008/04/04
ジャーナル フリーZinc alloys containing the hard phase are expected to have a high wear resistance. In this study, the effects of Al and Si of zinc alloys on the bearing performance under conditions of boundary lubrication have been investigated. A thrust type wear testing machine was used in the test.
The best wear resistance of Zn alloys was observed in a Zn alloy containing 10%Al and 1%Si by measuring the load carrying capacity. After wear testing of the Zn alloy containing Al and Si, the worn surface was covered by a thin layer around 1 μm in thickness. This thin layer was rich in silicon and poor in aluminum as compared with the inner part of the specimen. It is concluded that the stable thin layer has a good wear resistance for the zinc bearing alloy.抄録全体を表示PDF形式でダウンロード (1893K) -
大森 正信, 伊藤 操, 藤田 昌大1983 年 47 巻 6 号 p. 521-526
発行日: 1983年
公開日: 2008/04/04
ジャーナル フリーRing specimens prepared from a low carbon steel sheet were expanded in water by the use of a kind of detonator, and tensile specimens taken from the ring specimens were tested after the latter had been exposed in water to the explosive pressure. Results obtained are summarized as follows.
(1) Both yield stress and yield elongation decreased in the tensile specimen subjected to the explosive pressure, as observed in a specimen pressurized under a high hydrostatic pressure.
(2) Even a ring specimen with a very small critical impact tensile velocity revealed a larger circumferential fracture elongation, compared with a small elongation observed when the tensile specimen having the same critical velocity as the ring specimen was tested in an impact tension. This larger elongation appearing in the ring specimen is attributed to the increase of critical impact tensile velocity resulting from the lowering in yield stress due to the action of the explosive pressure.
(3) The above mentioned results inform us that the ductility properties of a steel plate under an explosive forming operation are appreciably affected by the explosive pressure.抄録全体を表示PDF形式でダウンロード (1036K) -
石原 襄, 生田 勲, 峯村 哲郎, 永井 正一1983 年 47 巻 6 号 p. 527-532
発行日: 1983年
公開日: 2008/04/04
ジャーナル フリーDimensional variation of the thickness across the width in an amorphous ribbon can be minimized in the double roller method by controlling sources of the dimensional non-uniformity. So, it is suitable in applications requiring many layers of metal ribbon. In the double roller method, however, since the surface temperature of roll rises rapidly, it has so far been thought that this method is unsuitable for the mass production. In this study, therefore, the water-cooling effect of rolls in the double roll method was investigated. Further, because a multiple-hole nozzle conventionally used in the double roller method is more expensive than a slit type nozzle, an attempt was made to modify the latter nozzle to apply to the double roller method.
At first, the surface temperature of the rolls was measured during the melt-ejection, and on the basis of this measurement, we tried to estimate the temperature by a numerical calculation using the finite difference method. Then the relations of the temperature rise in the rolls to the roll-materials, the diameter, the rotation speed and the width of ribbon were investigated. Behavior of metal flow from the nozzle was observed with high speed photography. Results obtained are summarized as follows:
(1) Since the melt flow from the slit type nozzle keeps a plane shape over the length up to 15 mm at maximum, this type nozzle can be applied to the double roller method.
(2) The maximum diameter of the rolls for which the slit type nozzle can be used is 200 mm.
(3) A Cu-Be alloy is most suitable for water-cooled rolls because of its high hardness and high thermal conductivity, but a steel roll is unsuitable for water-cooling because of its low thermal conductivity.抄録全体を表示PDF形式でダウンロード (1091K) -
花木 香司, 加藤 健三1983 年 47 巻 6 号 p. 533-538
発行日: 1983年
公開日: 2008/04/04
ジャーナル フリーEight kinds of industral aluminium sheet, i.e., 1050, 1100, 3004 and 5052 of both annealed material (O) and half-hard material (H/2), are used.
According to the tensile test by an instron type machine, r value, which is an important property for the press formability, scarecely varies with the strain rate.
Speed dependence of the flow stress is evaluated by m value. The figure of m value for various aluminium sheets is less than 10−2, and the range of these values is narrow. However, m value of these materials apparently decreases with the amount of alloying elements and with the hardness which results from the tempering. This means the decrease of the fraction of thermally activated component in the dislocation motion, for example, cross slip. Flow stress is higher for the material in which the cross slip is more difficult to occur. As a result, m value is inversely correlated to the flow stress through the thermally activated processes.
These m values influence the drawing load and the fracture load in the Swift’s cupping test. But LDR defined as the forming limit hardly depends on m value, because strain rates of stretching portion and drawing portion are of the same order; the variation of deformation resistance with drawing speed is the same in both the portions. The relative speed of material to the tool surface in each portion changes by a few orders, contrary to the strain rate. Characteristics of the liquid lubricant vary widely with speed. Material in the drawing portion is better lubricated than that in the stretching portion, because the relative speed of the former is higher than that of the later.
Speed effect of LDR is concluded as speed effect of the lubricant.抄録全体を表示PDF形式でダウンロード (851K)
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