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Volume 32, Issue 6
Displaying 1-8 of 8 articles from this issue
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Shizuo TADA1982 Volume 32 Issue 6 Pages 275-276
Published: June 30, 1982
Released on J-STAGE: July 23, 2008
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Shunsuke FUJIKI, Makoto TSUKUDA, Susumu KOIKE, Izumi FUKUI1982 Volume 32 Issue 6 Pages 277-283
Published: June 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSAl-7%Si-0.3 or 0.75%Mg casting alloys were solution treated at 535°C for 5hr, quenched in water, stored or preaged at -75° to 25°C for 3 to 95hr, and artificially aged. If the alloys are stored at -20° to 25°C, the hardness, tensile and yeild strength lowers, but the elongation and impact strength improve. If stored at -75° to -55°C, the alloys have mechanical properties identical to those of the alloys quenched and imediately aged. These facts are discussed on the basis of the change in supersaturation caused by clusters formed during storage and remained unchanged at 140°C.View full abstractDownload PDF (1130K) -
Hajime KATO, Tatsumi TOZAWA1982 Volume 32 Issue 6 Pages 284-289
Published: June 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe fatigue crack propagation behavior under tension-tension cyclic stress in air and 3% NaCl aqueous solution was investigated for 5052-H34 notched specimens. The aqueous solution has an effect on the fatigue life under low stresses. The crack in the solution propagates at a rate distinctly faster in the lower stress intensity factor range than in air, but does at a rate slower in the higher stress intensity factor range. The rate of increase of the crack propagation in the solution moderates at a certain value in the stress intensity factor range. This tendency is remarkable under lower stresses. This crack propagation behavior in the solution is attributed to pitting at a crack tip.View full abstractDownload PDF (1522K) -
Hisashi SUZUKI, Motohiro KANNO, Goroh ITOH1982 Volume 32 Issue 6 Pages 290-293
Published: June 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSTEM studies were made on the Al-1.2%Mg2Si-0.3%Mg alloy solution-treated at 833 K, quenched in several ways, and subsequently aged at 573 K mainly to clarify the heat-treatment condition for the precipitation of cuboidal phase and the phase change from β' to cuboidal phase. The cuboidal phase appears in no relation to quenching bath temperatures (_??_473 K), when the quenching rate of specimens is fast enough. Cuboidal precipitates coarsen by pre-aging at room temperature. The in situ observations show that the cuboidal phase forms through β'-phase. Based on these results, excess vacancies confined in clusters, β" or β' will facilitate the phase change from β' to cuboidal phase. The cuboidal phase, regarded as an intermediate phase, plays an important role in precipitation of the equilibrium β-phase.View full abstractDownload PDF (915K) -
Ken TOHMA, Akimi SUGIYAMA, Yo TAKEUCHI1982 Volume 32 Issue 6 Pages 294-302
Published: June 30, 1982
Released on J-STAGE: November 05, 2008
JOURNAL FREE ACCESSImmersion corrosion tests and electrochemical measurements were carried out to clarify the effect of Cu--SO4--, HCO3-and Cu++ions on the corrosion and pitting corrosion resistance of aluminum and Al-Mg-Zn alloy in NaCl solution. Though SO4--ion has a remarkable corrosion suppressing effect, it promotes pitting corrosion of aluminum in the solution containing Cu++ion. Little apparant pitting corrosion, on the other hand, can be observed on the Al-Mg-Zn alloy in all the solutions examined. These facts can be well understood in terms of anodic and cathodic polarization characteristics in the solutions containing these ions. The probability of pitting corrosion in the solution containing Cu++ion can be estimated in terms of the critical current for pitting initiation in the anodic polarization curve, but not of the pitting potential. The anodic dissolution test at a constant current density will be useful for estimation of pitting corrosion resistance of aluminum alloys.View full abstractDownload PDF (1919K) -
Osami SERI, Noboru MASUKO1982 Volume 32 Issue 6 Pages 303-310
Published: June 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSAnodic polarization curves were measured to investigate the effect of Fe element on initiation process of pitting corrosion on Al-Fe alloys in deaerated 0.1 M NaCl solution. The anodic polarization curves for Al-Fe alloys are interpreted as superposition of the anodic polarization curves for intermetallic compounds (FeAlx) on that for pure aluminum. An intermetallic compound does not always provide an insoluble cathode to aluminum matrix, but it dissolves out to initiate pitting. Ferrous ions eluted by the dissolution of intermetallic compounds are unstable and capable of depositing around pits to form an effective cathodic area.View full abstractDownload PDF (2241K) -
Akihiko KAMIO1982 Volume 32 Issue 6 Pages 311-324
Published: June 30, 1982
Released on J-STAGE: July 23, 2008
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Yasuo KOBAYASHI1982 Volume 32 Issue 6 Pages 325-334
Published: June 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (2169K)
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