巻号一覧
17 巻, 2 号
選択された号の論文の15件中1～15を表示しています
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Takuiti Morinaga, Shigeo Muromachi, Masao Yamada1953 年 17 巻 2 号 p. 53-55
発行日: 1953年
公開日: 2008/04/04
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Shoichi Annaka, Minoru Yasumura1953 年 17 巻 2 号 p. 56-59
発行日: 1953年
公開日: 2008/04/04
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川上 進1953 年 17 巻 2 号 p. 59-63
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーIn the previous paper, the thermal diffusion phenomenon was applied to dilute solutions of molten tin alloys. This experiment was extended to the general case including concentrated solutions in the present paper. The experimental apparatus and method were the same as the previous ones. The temperature gradient regarded approximately as a straight line was applied in the horizontal direction.
The results obtained were as follows: (1) The concentration gradient was distributed regularly along the temperature interval. It was found that the heavy molecule increased at the part of low temperature. (2) The thermal diffusion was very vigorous at the primary stage, especially in dilute solutions. The relation between the concentration difference Δn and the concentration of the solutes in the alloy was shown in Fig. 3. It was observed as the curve having the maximum point at the nearly middle part of the abscissa representing the latter. (3) The Soret coefficients at different ranges of concentration were determined from the experimental data by using the following equation derived theoretically,
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\ oindentwhere nl and nh are the concentrations of heavy molecules in the cold and hot parts respectively, and τ is the temperature difference. This equation can be applied not only to dilute solutions but also to concentrated ones. The magnitude of the Soret coefficients were proved to be 10−3∼10−4 in concentrated solutions of the tin alloys when the temperature difference was 250° (Th=650°, Tl=400°).抄録全体を表示PDF形式でダウンロード (597K) -
千早 正, 鹽田 信雄, 小野崎 長英1953 年 17 巻 2 号 p. 63-65
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーIn the report, the present writers investigated the crystal growth of selenium by using on X-ray high temperature camera. Two kinds of diffraction lines are observed. One of them changes the position in accordance with temperature and the other does not, and the intensity of the former increases and of the latter decreases with temperature. The crystal of selenium appears to undergo a two-phase transformation and so the former type is called B and the latter A. Vitreous selenium begins to crystallize into B-form in the course of heating as shown in the former report. B-form grows at 140° and is stable down to the temperature of 70°, but as the state at high temperatures cannot be brought down unchanged to room temperature, it is clear that the B-form is transformed into A-form as the temperature falls.抄録全体を表示PDF形式でダウンロード (359K) -
千早 正, 鹽田 信雄, 有賀 久1953 年 17 巻 2 号 p. 65-68
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーIn order to investigate the process of the crystal growth of selenium with an electron-microscope, the powdered specimens are directly exposed to electron-bombardment in the electron-microscope and various changing processes as shown in Photo. A, B and C are observed in accordance with the condition of each specimen (vitreous and crystallized Se). So indirectly with the replica method, each crystallizing process is observed by using both the optical microscope and the electron-microscope, and the results show that surface structures are different from the inner structure revealed through various etching reagents (NaOH, HNO3, CS2) as shown in Photo. E, F, and G.抄録全体を表示PDF形式でダウンロード (923K) -
山本 美喜雄, 渡邊 慈1953 年 17 巻 2 号 p. 68-73
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーLight figures of single crystals of white tin etched with various reagents may be classified into two groups. One group consists of light figures of tetragonal symmetry, of two kinds of digonal symmetry, of two kinds of digonal symmetry of rotatory reflection, and of non-symmetry, six kinds in all. This group of light figures is produced by etching with hydrochloric acid or like reagents. The other group, which is produced by etching with aqua regia or aqueous solutions of various salts, consists of light figures of tetragonal symmetry, of digonal symmetry, and of digonal symmetry of rotatory reflection, three kinds in all. It is shown that the light figures of the first group correspond to {001}, {100}, {110}, {101}, {301} and {211} planes, and those of the second group correspond to {001}, {100} and {101} planes. These findings indicate decidedly that generally light figures do not correspond to crystal directions but to crystal planes.抄録全体を表示PDF形式でダウンロード (918K) -
山本 美喜雄, 渡邊 慈1953 年 17 巻 2 号 p. 73-76
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーLight figures produced by single crystals of tetragonal tin etched with variously concentrated aqueous solutions of acids, alkalis and salts for various time-intervals were observed and their suitability for the orientation determination by the light-figure method was examined. The experimental results obtained are summarized in Table 1 in the text. For the orientation determination, light figures of the second group produced by a short-time etching with aqua regia or with saturated aqueous solution of ferric chloride or of ferric sulphate are most suitable.抄録全体を表示PDF形式でダウンロード (644K) -
柳橋 哲夫1953 年 17 巻 2 号 p. 77-80
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーThe equilibrium relation between partial pressure of the vapour in atmosphere, oxygen and hydrogen in molten copper, of which the theoretical formulae was shown in previous report, is numerically compared with the observed data in a reveberatory furnace refining of copper. The brief conclusions are as follows: (1) The concentration of hydrogen is determined theoretically from 1×10−5% to 3×10−5% in molten copper, when the oxygen content of copper is 0.03∼0.07% and the partial pressure of H2O is 3.8 mm∼121 mm at 1150°, in which these values are measured in a furnace atmosphere. In these cases, practically, the blowhole due to hydrogen gas evolution during solidification does not appear. Hence the appearance of the cast copper is sound. (2) On the contrary it is shown numerically that the hydrogen content of copper increases rapidly from 4×10−5 to 15×10−5%, when the oxygen content is diminished below 0.03%. This phenomenon is so called overpolin in copper refining. Therefore, in casting, many large blowholes are formed by the solubility change of hydrogen gas between solid and liquid phases during solidification. These conclusions obtained theoretically show very good agreement with the observed results of copper refining.抄録全体を表示PDF形式でダウンロード (682K) -
矢島 悦次郎1953 年 17 巻 2 号 p. 80-84
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーFor the Al diffused steels, many applications are considered, so that their mechanical properties as metallic materials have become important. Author, at the present, investigated the tensile strength, yielding strength, elongation, hardness of diffused layers and resistance against for abrasion of these Al diffused steels. Because the specimen was small, C and N2 greatly affected the strength and elongation. For example, the yielding point disappeared when the diffusion temperature was higher. This is caused by the fact that the N2 dissolved in steel become fixed as nitride of Al. The hardness of diffused layers depended upon the conditions of diffusion and the hardness of surface of samples diffused in atmosphere reached about Vickers 250∼350, but, of samples diffused in vacuum it was very low (Vickers 50∼60). Also when the diffusing condition was such as illastrated in Fig. 7b, surface diffusion occured and its hardness curve was different from others. In the resistance against of abrasion, steels did not give good results, but improved results were obtained by gray cast iron.抄録全体を表示PDF形式でダウンロード (810K) -
堀籠 健男1953 年 17 巻 2 号 p. 84-88
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーThe solidification process of Fe-C alloys, and the effects of Mg and Si have been reported in the previous papers. In this paper the experiments on the effects of Al and Mn on the solidification process of hypo-eutectic Fe-C system carried out by the same method as before are reported. The results of the thermal analysis and the microscopic examination lead to the following conclusions; The effect of Al on the solidification process of Fe-C alloys is quite similer to that of Si, but Mn acts reversely and results in a characteristic structure as the Mn content increases.抄録全体を表示PDF形式でダウンロード (1470K) -
西 成基1953 年 17 巻 2 号 p. 89-93
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーTo study the mechanism of age-hardening of magnesium rich aluminium-alloys, the following experiments were performed. Aluminium-magnesium alloy containing 10.65% Al (by wt.) was solution-treated at 420° for 50 hrs, then quenched in cold water. With these specimens, (1) changes in hardness, electrical resistance, and microscopic structures during aging at 100°, 125°, 150°, 175°, 200° and 250° were studied and also (2) changes in hardness, electrical resistance, specific gravity, thermal expansion and microscopic structures during heating from room temperature to 300° at the heating velocity of 1°C per min, were measured. The results are as follows: (1) The age-hardening of this alloy depends, principally, on strains caused by precipitation of δ-phase (intermetallic compound Al3Mg4) from super-saturated solid solution. Compared with those of magnesium rich zinc alloys, their strains are more remarkable and removal of them is more difficult. A slight hardening prior to precipitation is recognized. (2) According to changes in microscopic structures, precipitation takes place, at first, in the vicinity to grain boundaries and, after this stage has finished, begins at the remaining parts of the grains. This discontinuity decreases as the aging temperature becomes higher, and, at last, disappears. By overheating considerable softening is caused at the central part of grains, but, the softening is less apparent at parts adjacent to grain boundaries. The precipitation of this alloy belongs to the “discontinuous type”. The longer the aging-time, and the higher the aging temperature the coarser becomes the precipitate, that is, the sorbitic structure changes to the pearlitic structure.抄録全体を表示PDF形式でダウンロード (1043K) -
木村 啓造1953 年 17 巻 2 号 p. 93-95
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーTo determine the content of lithium in magnesium-lithium alloys, lithium was precipitated in saturated aqueous lithium chloride solution as Li·Ni·(UO2)3·(C2H3O2)9·nH2O, and determined gravimetrically by the following formula.
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Presence of magnesium, aluminium and zinc, if less than ten milligrams, did not interfere with the determination of lithium within the range of 0.1∼1 milligram. Thus, the quantity of lithium in magnesium-lithium alloys could be determined without the separation of lithium from the mother element.抄録全体を表示PDF形式でダウンロード (481K) -
五弓 勇雄, 高橋 久, 小林 勝1953 年 17 巻 2 号 p. 96-100
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーWire drawing with back tension was carried out on face centered cubic materials, mainly phosphor bronze wire containing 6% Sn. The results are as follows: (1) The effects of back tension on drawing force, die pressure, stress distribution in the wire within die channel, every work consumption and efficiency of deformation have the same tendencies as in the drawing of iron wire and carbon steel wire. (2) At low reduction, as the back tension increases, the tensile strength and the yield strength of the drawn wire decrease to some degree, but the elastic limit and the Young’s modulus rather increase. (3) The elastic limit of the drawn wire with 40% back tension ratio is about 16% higher than that of the ordinarily drawn wire at the same 60% reduction. (4) The difference between the elastic limits of wires drawn by the ordinary method and the back tension method becomes larger as the bak tension ratio increases, but the difference becomes nearly constant when this ratio exceeds 40%. (5) After low temperature annealing of hard drawn wires by both methods, the elastic limit increases owing to the strain aging, but its effect is more marked in ordinarily drawn wire. (6) After annealing with recrystallization, the elastic limit of drawn wire with back tension is about 11% higher than that of ordinarily drawn wire. (7) When the crystallographic anisotropy of the elastic limit of face centered cubic material is calculated in all directions, the elastic limit in [111] direction is 1.5 times as high as that in [100] and [110] directions. (8) Observation of X-ray fibre structure photographs reveals that the fibre degree of the internal part of wires drawn with and without back tension are almost equal but the fibre degree of the external part of the former is higher than that of the latter. (9) The excellence of the elastic property of the phosphor-bronze wire drawn with back tension is illustrated theoretically from the superiority of [111] fibre degree which has the highest elastic limit and the decrease of nonuniform microscopic stress which injures the elastic property.抄録全体を表示PDF形式でダウンロード (800K) -
1953 年 17 巻 2 号 p. 100b
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリー -
1953 年 17 巻 2 号 p. 100a
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーPDFを参照． （誤）(1+{α/μ), =kf=σf, σf=σr=Pr/F0, σc=σy0, =Pf/F1σc=, Wt=Pr.l1, Al Red, back tension), 東京製鋼 （正）(1+α/μ), =kf=σy, σt=σr=Pr/F0, σc=σy0-σr, =Pf/F1, σc=, Wt=Pf·l1, Al Rod, back tension 140 kg), 東京製鋼抄録全体を表示PDF形式でダウンロード (32K)
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