All issues
Volume 34, Issue 10
Displaying 1-8 of 8 articles from this issue
- |<
- <
- 1
- >
- >|
-
Kazuo OZAKI1984 Volume 34 Issue 10 Pages 555-556
Published: October 30, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (349K) -
Tetsuya TAKAAI, Akiyoshi DAITOH1984 Volume 34 Issue 10 Pages 557-561
Published: October 30, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSAn instrumented Charpy impact test was made at temperatures from -196° to 200°C on 5083 alloy cold rolled by 20% in the crack propagating direction. The total impact energy absorbed at a moment of impact is decreased by about 20 to 30% in a temperature range from -100° to 0°C paticularly at -100°C by cold roll hardening. A remarkable laminated fracture behavior and an obscure effect of cold roll hardening are found at -196°C. These behaviors are intensified in particular directions in the rolled alloy. The maximum fracture load of the cold rolled alloy remarkably increases at -196°C, but slightly decreases at 0°C or above. The maximum fracture load at a moment of impact has a nearly linear relationship to the test temperature. The abrupt depression of the total energy absorbed at a moment of impact is independent of the maximum load.View full abstractDownload PDF (2320K) -
Yoshizo NAKATANI, Tadakazu OHNISHI, Teruhiro HATANAKA, Masao MAEDA1984 Volume 34 Issue 10 Pages 562-569
Published: October 30, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSMonovariant Al-Mg2Si eutectic alloys having quasibinary eutectic composition were unidirectionally solidified. Al-8.3%Mg-3.8%Si alloy containirig slightly excess Mg shows the most suitable structure for an aligned composite material. Eutectic cell structures form and Mg2Si plates transform into rods at faster solidification rates decreasing their interspacings λ. A relation Rλ2 = 200 μm3/s exists. The non-cell alloy above shown solidified at a low rate has the maximum strength 45.4 kg/mm2 at room temperature and is stable at elevated temperatures. The strength is raised up to 53 kg/mm2 by aging and the elongation is also increased.View full abstractDownload PDF (4201K) -
Toshimasa MOROOKA, Chuji KAWAMURA, Eiji YUASA, Takashi SUZUKI1984 Volume 34 Issue 10 Pages 570-577
Published: October 30, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSAluminum powder compacts in which different sizes and amounts of stainless steel fibers had been dispersed were extruded by the canning method. When the compact contains short fibers less than 10% in volume fraction, the composite rod having good surface quality over which a thin aluminum layer covers is obtained. The compact containing short fibers requires higher extruding load than that free from short fibers and an aluminum rod. Most of short fibers near the center of extruded compact are deformed to a wave shape and those in the surface layer are fractured. The composite consequently has the tensile strength lower than that calculated on the basis of the rule of mixture.View full abstractDownload PDF (2046K) -
Yoshizo NAKATANI, Tadakazu OHNISHI, Teruhiro HATANAKA, Hiroyuki KOZIMA1984 Volume 34 Issue 10 Pages 578-584
Published: October 30, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe in situ composite Al-6%Ni eutectic alloys containing such third elements as Ti, Cu, Mg, Fe, Cr and Mn were unidirectionally solidified at solidification rates R = 15 to 600 μm/s at temperature gradients G = 60 to 70°Ç/cm to strengthen the alloys. Additions of Cr and Mn are effective to improve the properties. The interphase spacing λ of the alloys changes in accordance with Rλ2 = 120 μm3/s. The formation of cellular eutectics depends on G/R ratio, Cr and Mn contents and preexisting impurities. Micro-Vickers hardness in the eutectic region increases with Cr and Mn contents and in proportion to λ -1. An Al-6%Ni-1.0%Cr alloy has the maximum strength 46.4 kg/mm2. Al-6%Ni-1.5 and 2.0%Mn eutectic alloys have strength 40 kg/mm2 or more. The strength at elevated temperatures was also examined.View full abstractDownload PDF (1891K) -
Katsuhisa NAGAYAMA, Katsusaburo TOYODA, Yoshishige TSUMURA1984 Volume 34 Issue 10 Pages 585-590
Published: October 30, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSFeasibility of electrorefining was studied. 6wt% AlCl3 was contained in binary chloride electrolytes chosen from NaCl, KCl, LiCl and MgCl2 with melting points from 398° to 670°C. Electrorefining was made at 700°C. The cathode current efficiency lowers with prolonged electrolyzing time and also with increasing current density. The diaphragm should be 4.5 mm in thickness to assure the current density 0.1 A/cm2 for electrorefining at the voltage 0.5V. Electric power consumption for electrorefining will be under 1, 700 kWh per ton of refined aluminum excluding heating energy for bath temperature, if the cathode current efficiency is 90% or more. The cathode current efficiency is, however, not so high in this work.View full abstractDownload PDF (2400K) -
Mitsugu MOTOMURA1984 Volume 34 Issue 10 Pages 591-606
Published: October 30, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (2726K) -
Takuichi MORINAGA1984 Volume 34 Issue 10 Pages 607-617
Published: October 30, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (1401K)
- |<
- <
- 1
- >
- >|