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Volume 35, Issue 3
Displaying 1-9 of 9 articles from this issue
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Toshio ISOBE1985 Volume 35 Issue 3 Pages 131-132
Published: March 31, 1985
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (331K) -
Akihiko KAMIO, Hiroyasu TEZUKA, Jung-Chul CHOI, Tsuneo TAKAHASHI1985 Volume 35 Issue 3 Pages 133-139
Published: March 31, 1985
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSMicrosegregation and homogenization behaviors in Al-6.5% Cu alloys with and without V and Ti were investigated in terms of the amount of non-equilibrium eutectic phase and the minimum solute concentration in dendrite arms. The amount of non-equilibrium eutectic phase increases and the minimum concentration of Cu decreases with the addition of V and Ti. Solutionizing of non-equilibrium CuAl2 delays in the alloys with V and Ti. Complete homogenization of Cu is hardly achieved even by heat treatment at 530°C for 100h. The addition of V and Ti leads to V and Ti-rich cored structures in α-dendrites. V and Ti concentrations are about 3.5 and 4.5 times of the initial contents respectively. They remain even by 95% heavy rolling and homogenizing at 530°C for 500h.View full abstractDownload PDF (2141K) -
Effect of iron, silicon and zirconium content on stress corrosion cracking resistance of 7050 alloysRyotatsu OTSUKA, Shigeyuki KIKUCHI1985 Volume 35 Issue 3 Pages 140-146
Published: March 31, 1985
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSEffect of iron, silicon and zirconium on stress corrosion cracking resistance of short transverse direction in 7050-T6, T76 extruded bars was investigated in air or salt-dichromate solution. In T76 temper, stress corrosion cracking resistance was inferior at about 1.0% "Fe+Si". Contrarily, it was improved at the same "Fe+Si" content in T6 temper. These results were explained by considering Al-Fe-Cu or Mg-Si compounds. There was no difference of stress corrosion cracking resistance between zirconium containing alloys with fiber structure and non zirconium cotaining alloys with recrystallized structure. Stress corrosion cracking resistance in T76 temper was very much superior to in T6 temper.View full abstractDownload PDF (1655K) -
Kunio ITO, Nobuaki NAKASHIMA1985 Volume 35 Issue 3 Pages 147-153
Published: March 31, 1985
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSEffects of Zr contents, purities of base aluminum metals, hot and cold working on the formation of so-called unrecrystallized grains in alloys based on AA-7050 have been examined with special reference to effect of fine particles on the migration of recrystallization front.
Unrecrystallized grains in solution annealed alloys formed in the regions where fine metstable Al3Zr particles under critical sizes existed. The particles precipitated during annealing of cast ingots as well as of hot worked specimens. With increasing Zr contents, the fraction of fine particle precipitated areas increased and the size of the particles decreased. The critical radii of the particles in hot and cold worked alloys were respectively 0.018μm and 0.014 μm. With Zr contents, the fraction of unrecrystailized grains increased and the size of recrystallized grains decreased also. These results lead to the following general conclusions: The fraction of unrecrystallized grains increases with the fraction of regions where fine particles under the critical size exist. The size of recrystallized grains increases with the size of fine particle free areas. Effects of purity of the base metals as well as cold working were also interpretable with this general trend.View full abstractDownload PDF (1339K) -
Susumu IKENO, Yuichi YAMAMOTO, Yasuhiro UETANI, Shizuo TADA1985 Volume 35 Issue 3 Pages 154-161
Published: March 31, 1985
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSEffects of thermo-mechanical treatment on mechanical properties of the alloy were investigated by tensile tests. When Al-1%Mg2Si-0.4%Si alloy is cold rolled by 30% and aged at 150°C, intergranular fracture becomes predominant with prolonged aging time and the elongation reduces to 2% or less. If the amount of deformation is as high as 90% in this case, both tensile strength and elongation increase with an increase in aging time. The elongation at the maximum strength during aging is remarkably improved from that obtained by aging just after solution treatment. The elongation at the maximum strength during aging lowers at elevated aging temperatures after cold rolling.View full abstractDownload PDF (2563K) -
Hajime YAMADA, Takio TANAKA1985 Volume 35 Issue 3 Pages 162-167
Published: March 31, 1985
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSPrecipitation of silicon during annealing also retards the recrystallization of aluminum, but its effect is smaller than that of precipitation of iron compound in Al-Fe alloy. Precipitated silicon particles due to precipitation treatment prior to annealing have a marked effect for particle stimulated nucleation same as primary inclusions of Al3Fe. The recrystallization of Al-Fe alloys is accelerated by the coexisting silicon, and generation of grain is also intensified. The grain growth at high temperature is prevented remarkably by the primary inclusions in Al-Fe alloys. Its grain growth, however, is rather intensified by the coexisting silicon.View full abstractDownload PDF (813K) -
Ken TOHMA, Yo TAKEUCHI, Sadao NISHIYAMA, Toshihiko KAWASHIMA1985 Volume 35 Issue 3 Pages 168-175
Published: March 31, 1985
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSEffects of Cl ion concentration, pH, temperature and dissolved oxygen on corrosion resistance of 5182 and 3004 alloys for can stocks in citric acid and sodium citrate solutions were investigated. Effects of temperature and dissolved oxygen were dominating. No localized corrosion was observed in the test at temperatures up to 25°C. Corrosion rate was greatly decreased by deaeration, while pitting corrosion occured in acidified oxygen saturated solution at temperatures higher than 40°C. Results of the immersion corrosion test agree with those of test pack and they were well understood in terms of electrochemical polarization characteristics.View full abstractDownload PDF (1300K) -
Eizo ISOYAMA, Toshimitsu UCHIYAMA1985 Volume 35 Issue 3 Pages 176-187
Published: March 31, 1985
Released on J-STAGE: July 23, 2008
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Jiro KITAGAWA1985 Volume 35 Issue 3 Pages 188-194
Published: March 31, 1985
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (1205K)
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