巻号一覧
28 巻, 9 号
選択された号の論文の8件中1～8を表示しています
- |<
- <
- 1
- >
- >|
-
大平 五郎1978 年 28 巻 9 号 p. 431-432
発行日: 1978/09/30
公開日: 2008/07/23
ジャーナル フリーPDF形式でダウンロード (305K) -
柴田 政勝, 西 成基1978 年 28 巻 9 号 p. 433-437
発行日: 1978/09/30
公開日: 2008/07/23
ジャーナル フリーAl-Mg alloys were unidirectionally solidified. Changes of dendrite arm spacing and size, density, interparticle distance and volume fraction of nonequilibrium second phase were examined. Primary dendrite arm spacing Z1 and secondary one Z2 decrease with increase of cooling rate and are expressed as:
Z1 = 4.8×10-2√C0/V Z2 = 3.7×10-3V-0.31
where Z1 and Z2 are in cm, C0 is Mg%, and V is the average cooling rate in °C;/sec in the solid-liquid zone. Volume fraction of nonequilibrium second phase g0decreases with increase of cooling rate:
g0 = kV-3
Proof stress slightly increases and U. T. S., elongation, absorbed energy greatly increase with increase in cooling rate. Elongation and absorbed energy decrease with increase of g0.抄録全体を表示PDF形式でダウンロード (960K) -
柴田 政勝, 西 成基1978 年 28 巻 9 号 p. 438-442
発行日: 1978/09/30
公開日: 2008/07/23
ジャーナル フリーThe change of nonequilibrium second phase by solution treatment was obserbed particularly concerning with dendrite arm spacing. The effect of solution treatment time on the brittleness of the solution treated Al-8%Mg alloy by aging was studied. If the volume fractions of nonequilibrium second phase at times 0 and t are g0 and g respectively, g/g0 is expressed as:
g/g0 = exp (kt/l02)
where l0 is one-half of secondary arm spacing, and k is a constant concerning with a diffusion constant of second phase. As g0 and l0 are functions of cooling rate, depletion time of nonequilibrium second phase is graphically shown as a function of cooling rate. The proof stress slightly decreases, but elongation and absorbed energy greatly increase with solution treatment. The changes in elongation and absorbed energy correspond to the change of volume fraction of second phase. The longer the solution treatment time is taken, the later the time in which frac tures change from ductile to brittle becomes.抄録全体を表示PDF形式でダウンロード (843K) -
江島 辰彦, 嶋影 和宣, 星 政義1978 年 28 巻 9 号 p. 443-449
発行日: 1978/09/30
公開日: 2008/07/23
ジャーナル フリーRed mud was treated with ammonium bisulfate at 400° to 450°C to form a double salt of ammonium aluminum sulfate soluble in water. Aluminum and iron were leached in sulfuric acid after sulfatizing roasting. Ammonium alum was crystallized out of the leaching solution containing iron. The optimum conditions for yielding ammonium alum in the leaching solution are: pH 1.7, the concentration degree 3/4 and the addition of ammonium sulfate 4.8 equivalent. The high purity ammonium alum is predominantly crystallized if the reducing agent is added into the leaching solution. The final recovery of aluminum from red mud can exceed about 77%. A flow sheet is also proposed for treating red mud by the use of ammonium sulfate as a solvent.抄録全体を表示PDF形式でダウンロード (940K) -
時末 光, 加藤 数良1978 年 28 巻 9 号 p. 450-454
発行日: 1978/09/30
公開日: 2008/07/23
ジャーナル フリー2017-T4 alloy was friction welded using a brake type welding machine. The fibrous structures are pressed forward the outside by the axial pressure on the heat affected zone and disappear at the welded layer. The welded joints have the tensile strength the same as that of the base metal and have less elongation and reduction of area. All the friction welded bars are fractured at the base metal in the cup and cone types. The impact specimens in which the notch is put into the weld interface show impact strength lower than that of the base metal. If the notch is placed at 5mm or more from the weld interface, nearly the same impact strength is achieved. Micro Vickers hardness is nearly equal on the weld interface to that of the base metal, but is lowered at the heat affected zone.抄録全体を表示PDF形式でダウンロード (1590K) -
津村 善重, 榊原 秋策, 豊田 勝三郎, 渡辺 重信1978 年 28 巻 9 号 p. 455-460
発行日: 1978/09/30
公開日: 2008/07/23
ジャーナル フリーSeveral anode materials for electrolizing an aluminum chloride bath were tried to use as a substitute for carbon or graphite. A tungsten plate is found to be most suitable. It brings no weight loss during electrolysis. Dendritic aluminum electrodeposited on an aluminum cathode plate is splitted, filtered from the electrolytic bath, and recovered in the form of globules after melting in the flux. Current-potential curves for AlCl3-NaCl-KCl, AlCl3-NaCl, and AlCl3-LiCl baths were measured. The effect of bath temperature or current density on the recovery efficiency was also examined. The recovery efficiency of the ternary eutectic bath is about 90 to 92% at bath temperature 180°C. The current density has no effect on the recovery efficiency within 2.5 A/cm2.抄録全体を表示PDF形式でダウンロード (997K) -
鈴木 寿, 菅野 幹宏, 坂野 茂治1978 年 28 巻 9 号 p. 461-468
発行日: 1978/09/30
公開日: 2008/07/23
ジャーナル フリーThe Al-4%Cu-Sn alloys having Sn up to 0.065% were solution-treated at 520560°C, quenched into iced water, up-quenched at 100400°C for 3min at maximum, quenched and finally aged at 50100°C. The aging rate of ternary alloys becomes greater in contrast to the usual understanding than that of binary alloy with increasing Sn contents, only when the specimen is up-quenched at temperatures from about 150 to 300°C. The fact is proved on the basis of the aged structures, in which, under the condition, G. P. zone size in ternary alloy is always larger than that in binary alloy. The special aging behavior of ternary alloy would be understood considering that the nature of clusters in ternary alloy should be different from that in binary alloy.抄録全体を表示PDF形式でダウンロード (2819K) -
阪口 章1978 年 28 巻 9 号 p. 469-480
発行日: 1978/09/30
公開日: 2008/07/23
ジャーナル フリーPDF形式でダウンロード (2138K)
- |<
- <
- 1
- >
- >|