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Volume 34, Issue 5
Displaying 1-8 of 8 articles from this issue
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Tsutomu YANAGASE1984Volume 34Issue 5 Pages 263-264
Published: May 31, 1984
Released on J-STAGE: July 23, 2008
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Effects of metal flow on fatigue strength and mechanical properties of ZK60A magnesium alloy forgingMasayuki HARADA, Toshio SUZUKI, Izumi FUKUI1984Volume 34Issue 5 Pages 265-272
Published: May 31, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSEffects of metal flow on mechanical properties particularly on fatigue strength of ZK60A forgings were studied. The forgings are the most strong in yield, tensile and fatigue strength in the longitudinal direction and weaken as the loading direction turns to the transverse direction. They have particularly the yield strength so weak as 13 to 15 kgf/mm2 that corresponds to only a half of the strength in the longitudinal direction. The maximum elongation is achieved at angles 45° to 60° to the metal flow direction. The fatigue strength σW is expressed as a function of tensile strength σB, σW/σB 0.87-0.07 logN. where N is cycles: ZK60A magnesium forgings have a greater effect of metal flow on strength than aluminum alloy and AZ80A magnesium alloy forgings.View full abstractDownload PDF (1914K) -
Motoaki IWATA, Yasuhiko ITOI, Eiichi SATO1984Volume 34Issue 5 Pages 273-277
Published: May 31, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSFiliform corrosion of A-1070 and pitting corrosion of A-1050 were investigated. Dipping tests and electrochemical measurements in 3wt%NaCl solution were carried out. A saturated calomel electrode as a reference electrode was used. Scanning electron microscopy on the sample surface was made. Filiform corrosion terminates after immersion for 120min. It is caused by slight dissolution of oxygen. A-1070 shows a lower corrosion rate than A-1050. Effective cathodic areas of A-1070 and A-1050 are caused by Fe and Cu of an impurity, respectively.View full abstractDownload PDF (1251K) -
Hisanori TANIYAMA, Kohei TOMITA1984Volume 34Issue 5 Pages 278-282
Published: May 31, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSA new degassing method practically applicable for molten aluminum is proposed, in which a mullite exhaust tube connected to a vacuum pump is inserted in molten aluminum. The gas in the melt diffuses through the tube wall to attain the equilibrium of partial pressures in the melt and in the tube. The gas volume in molten aluminum at 750°C remelted after solidification in a furnace effectively reduces down to about 0.1cc/100g at S. T. P. This method has nearly the same degassing efficiency as that of vacuum degassing method.View full abstractDownload PDF (779K) -
Kozo ARAI, Takao SUZUKI, Masashi SAKAGUCHI1984Volume 34Issue 5 Pages 283-288
Published: May 31, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSEffects of Si content 0.002 to 0.006% and of intermediate annealing temperature after hot rolling on grain coarsening of high purity aluminum plates cold rolled and armealed at 380°C were studied. Two types of recrystallized grain coarsening are observed. One occurs in aluminum secondary recrystallized by intermediate annealing at temperatures above 500°C and cold rolled at rolling reduction 80%. The other occurs in aluminum intermediately annealed at temperatures below 400°C particularly 200° to 300°C and cold rolled at rolling reductions 80% or more. This type of grain coarsening can bc prevented effectively by 0.006%Si in aluminum. Al-Si precipitates 0.1μm in size are found in aluminum intermediately annealed at 300°C. The grain coarsening is attributed to precipitation of Fe and Si by annealing at 200° to 300°C and to decreases of Fe and Si in solid solution.View full abstractDownload PDF (1810K) -
Tetsuo INOUE, Takeo SHINODA, Takeo OKI1984Volume 34Issue 5 Pages 289-293
Published: May 31, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSHardness, tensile strength and electrochemical polarization characteristics of Al-4%Zn-2%Mg alloys containing Zr 0 to 0.3% were investigated. The alloys aged at 180°C into which about 0.2%Zr has been added have tensile strength remarkably improved. The pitting potential of the alloys in 0.5N NaCl solution increases with aging time. A change in pitting potential is explained on the basis of a change in solute quantity of Zr and/or Mg on the alloy surface. Passive current of the alloys in 0.5N NaCl solution is reduced by increasing Zr content.View full abstractDownload PDF (992K) -
Takuji OKUGAWA, Yoshiyuki KAMIMOTO1984Volume 34Issue 5 Pages 294-300
Published: May 31, 1984
Released on J-STAGE: July 23, 2008
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Hiroyasu TEZUKA, Akihiko KAMIO1984Volume 34Issue 5 Pages 301-314
Published: May 31, 1984
Released on J-STAGE: July 23, 2008
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