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Volume 42, Issue 6
Displaying 1-11 of 11 articles from this issue
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Koichi TADA, Atsumi OHNO1992 Volume 42 Issue 6 Pages 321-326
Published: June 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSA continuous casting technique for producing thin strips of aluminum has been developed. An open type, horizontal, heated mold is used instead of a conventional cooling mold. It is essential for successful production of strips that the mold temperature is maintained higher than the melting point of aluminum, and that the solid-liquid interface is located within the mold. Cooling water was applied only to the top surface of the solidified strip. The strips obtained exhibited a unidirectionally solidified structure. The surface of the strip was extremely smooth and flat.View full abstractDownload PDF (1001K) -
Wataru FUJITANI, Kazuo SAKAMOTO, Shigenori HORI, Hideo TAI, Toshiya SH ...1992 Volume 42 Issue 6 Pages 327-332
Published: June 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSEffect of cold working on erosion behavior in connection with recrystallization of Al-Mn alloy core brazing sheets was investigated. Cold rolled brazing sheets were heated up to predetermined temperatures. The microstructure was observed on the longitudinal section of the core and cladding alloys. The recrystallization temperature of highly cold worked specimens decreases with increasing cold working. On the contrary, the specimens cold rolled to 10-20% retain unrecrystallized structure having a high density of dislocation even at brazing temperature. The relation between the dislocation structure and erosion behavior during heating is also described. The completely recrystallized coarse grain of core alloy has shown an excellent erosion resistance.View full abstractDownload PDF (1629K) -
Minoru ICHIMURA, Yasushi SASAJIMA, Mamoru IMABAYASHI1992 Volume 42 Issue 6 Pages 333-338
Published: June 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSHydrogen diffusivity in Al-(2-18 mass%)Si alloys melted in air were measured by a desorption technique which was an outgassing study from cylindrical samples. The diffusivity of D1 for as-cast samples were decreased to D2 for hydrogen-charged samples. The differences between D1 and D2 were enlarged for lower temperatures and for the more eutectic at higher silicon concentration. The decreasing of diffusivity from D1 to Dv2 by heating was due to a morphogy change of eutectic silicon, from two reasons, one of which is a loss of long-range enhanced diffusion path along surfaces on plate-like particles of eutectic silicon for as-cast samples and the other reason is a grow-up of hydrogentrapping at coagulated and isolated particles of silicon. A downward aberration of diffusivity at around 400°C was related to a hydrogen trapping by small silicon particles precipitated from a supersaturated alpha-aluminum solid solution.View full abstractDownload PDF (1335K) -
Tetsuya TAKAAI, Kazuki KATOH, Yoshihiro NAKAYAMA1992 Volume 42 Issue 6 Pages 339-344
Published: June 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSChanges in m-values during tensile deformation of Zn-22%Al notched specimens were investigated. Elongation to fracture in the notched specimens showed m-value dependences as in the case of smooth specimens. Calculated elongation to fracture and load-elongation curves by superplastic deformation model were reasonably corresponding to the experimental values. Elongation to fracture in the notched specimens was variable by changing cross head speed during the tensile deformation.View full abstractDownload PDF (1045K) -
Toshiyuki SATO, Junichi KANEKO, Makoto SUGAMATA1992 Volume 42 Issue 6 Pages 345-351
Published: June 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSRapidly solidified flakes of AZ91 magnesium based alloys with or without addition of Si, Ni, Ce were produced by atomizing the alloy melt and subsequent splat quenching onto a water-cooled copper roll. Consolidation of the flakes was carried out by cold pressing and hot extrusion at a reduction ratio of 25:1. Higher tensile strength at room temperature was obtained for as-extruded materials than for T6-treated ones due to softening observed during solutionizing heat treatment. The as-extruded material of Si-bearing alloy showed the highest tensile strength of 371MPa. However, as-extruded materials showed lower strength and higher elongation at higher testing temperatures because of their fine grained structures. At 573K, superplastic elongation as high as 415% was observed. It is postulated that the P/M materials with high specific strength at room temperature combined with very high ductility at elevated temperatures can be obtained by applying rapid solidification to magnesium based alloys.View full abstractDownload PDF (1498K) -
Yoshinari OKI, Yoshihiro YOSHIDA1992 Volume 42 Issue 6 Pages 352-353
Published: June 30, 1992
Released on J-STAGE: October 30, 2008
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Haruo NAKATA1992 Volume 42 Issue 6 Pages 354-357
Published: June 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (487K) -
Hirofumi INOUE1992 Volume 42 Issue 6 Pages 358-367
Published: June 30, 1992
Released on J-STAGE: October 30, 2008
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Takeo MATSUTANI1992 Volume 42 Issue 6 Pages 368-370
Published: June 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (291K) -
1992 Volume 42 Issue 6 Pages 371-373
Published: June 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (335K) -
1992 Volume 42 Issue 6 Pages 374-376
Published: June 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (602K)
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