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Volume 39, Issue 1
Displaying 1-12 of 12 articles from this issue
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Hideo OGASHI1989 Volume 39 Issue 1 Pages 1-2
Published: January 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (315K) -
Takashi INABA, Eiki USUI, Noboru SHINANO1989 Volume 39 Issue 1 Pages 3-7
Published: January 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe age-hardening behavior of cold rolled (H19) and solution-treated Al-1% Mn-1% Mg alloy sheets were investigated. Commercial Al-Mn-Mg alloy (3004) contains Si, Fe and Cu as impurities. 3004 alloy shows age-hardening when Cu exists in the solid solution. The tensile strength of cold rolled sheet increases by aging at 200°C for 20min. The peak strength of solution-treated sheet is obtained by aging at 150°C for 6, 000min. The age-hardening of this alloy is caused by GPB zones and S' phases as like in Al-Cu-Mg alloy. The baking after coating and printing in 3004 alloy is useful for can body stock to get high strength.View full abstractDownload PDF (1145K) -
Hidetoshi KOBAYASHI, Hiroshi OKUBO, Masashi DAIMARUYA1989 Volume 39 Issue 1 Pages 8-14
Published: January 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSIn order to clarify the relationship of characteristic values obtained by the tensile tests and lateral compression tests, the both tests for cylindrical tubes of aluminum alloy were carried out at a quasi-static rate. The relatively hard alloys were selected as the fracture occurs at one or both sides of tubes in the lateral compression test. A theoretical study concerning the lateral compression of thin-walled tubes was also performed. A new model introducing strain hardening into an ordinary plastic hinge theory was proposed. Load/deflection curves predicted by using the new model agreed well with experimental curves for all materials tested. The proof stress and ultimate strength were also obtained from the lateral compression test data by using our new plastic deformation model. These values showed good agreement with those obtained from tensile test data.View full abstractDownload PDF (824K) -
Tadakazu OHNISHI, Taichiro ITO1989 Volume 39 Issue 1 Pages 15-20
Published: January 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSWork-hardening, annealing characteristic, tensile properties and corrosion resistance of Mg-Li binary alloys, containing 8, 12 and 20 wt% lithium, were investigated. The 8Li alloy, which has (α+β) eutectic structure, shows relatively high initial strength and high ability to work-hardening, while β single phase alloys of 12Li and 20Li have lower strength and limited ability to work-hardening. However, plastic formability of these β phase alloys is extremely superior to the alloy containing α phase. Hardened states of these alloys are stable at room temperature, but at elevated temperatures recovery and recrystallization occur quickly. The density of alloy decreases with increasing the lithium content and that of 20Li is only 1.19g/cm3. The corrosion resistance of 8Li in 100% humidity is similar to other commercial magnesium alloys, but these of 12Li and 20Li are considerably inferior. The resistances in dry air are fairly good.View full abstractDownload PDF (977K) -
Yoshiaki YAMAMOTO, Yasushi IWATA, Motoyuki NAKAMURA1989 Volume 39 Issue 1 Pages 21-24
Published: January 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSCasting defects which occur at the finally filled portion in practical board-shaped ADC12 die castings were studied by examining the change of gas pressure in the die cavity. When the gas pressure in the die cavity at the finally filling stage of molten metal reduces from 1.8 to 0.2kgf/cm2 by altering the casting condition and by placing vents, the molten metal flow accelerates from 2.0 to 5.0m/s, resulting in the occurence of a few casting defects at this portion. These die castings have few blisters on their surfaces even after heat treating at 495°C for 4h.View full abstractDownload PDF (522K) -
Shigeru YONETANI, Hisakimi NOTOYA, Kosei SHIBATA, Yuzo TAKATSUJI1989 Volume 39 Issue 1 Pages 25-31
Published: January 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSEutectic Al-Si alloy castings AC3A annealed for stress relief were wet ground by the use of a quick stop grinding tester equipping a SiC-type grinder. Effects of grinding parameters and plastic deformation on the residual stress in the castings were evaluated from working conditions and residual stress by the X-ray method. Plastic strains in the ground subsurface were measured by the grid method. The maximum residual stress in the ground layer and the depth of tensile stress layer increase according to the depth of cut and work speed. The plastic strain in the grinding path changes at different working conditions.View full abstractDownload PDF (858K) -
Hajime YAMADA, Takio TANAKA1989 Volume 39 Issue 1 Pages 32-37
Published: January 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSAl-4.5 mass%Zn-1.5 mass%Mg alloy sheets containing such a transition element as 0.1 to 0.2 mass%Cr, 0.2 to 0.7 mass%Mn or 0.1 to 0.2 mass%Zr were studied. Cr, Mn and Zr have a significant effect of retarding grain growth in Al-Zn-Mg wrought alloys. Grain coarsening at elevated temperatures is effectively prevented by additions of 0.2 mass%Cr, 0.2 mass%Zr and 0.7 mass%Mn. Cr effectively works independently of the homogenizing condition for ingots. The effect of Mn and Zr additions moderates at elevated homogenizing temperatures. The effect of Zr addition also diminishes in the sheets rolled from unhomogenized ingots.View full abstractDownload PDF (1498K) -
Genjiro MOTOYASU, Atsumi OHNO1989 Volume 39 Issue 1 Pages 38-44
Published: January 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSAl-1 to 50 mass%Cu alloy billets were cast by the horizontal heated mold continuous casting method (OCC) developed by the authors. The surface condition, macrostructures and mechanical properties of the billets were examined and compared with those of the billets produced by a conventional method. The OCC billet has a flat mirror-like surface having the surface roughness value 1/10 of that of the usual billets. It is constituted macroscopically of an unidirectionally solidified single crystal seemingly and microscopically of aligned primary and eutectic phases. Mechanical properties of the OCC billet such as tensile strength, hardness and bending fatigue life are superior to those of conventional billets. Wrought products rolled, drawn and bent from the OCC billet are free from such defects as edge cracking, peeling and surface cracking.View full abstractDownload PDF (2597K) -
Kazuo MATSUZAWA, Toshio KOSHIHARA, Yo KOJIMA1989 Volume 39 Issue 1 Pages 45-51
Published: January 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSRolling workability, age-hardening and mechanical properties of Mg-5 to 16 mass%Li-1 mass%Al alloys were studied. The limit of reduction for cold rolling of the alloys containing 16 mass%Li exceeds 99.9%. The α+β phase alloys at 8, 10 and 11 mass%Li and the β phase alloy at 16 mass%Li are age-hardenable. A remarkable decrease in elongation is encountered for the β phase alloy having the maximum hardness. Fine platelet precipitates are observed by transmission electron microscopy in the age-hardened 8 mass%Li alloy.View full abstractDownload PDF (1937K) -
Japan Magnesium Association, Committee Of MWT1989 Volume 39 Issue 1 Pages 52-57
Published: January 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (737K) -
Toshio ENJO1989 Volume 39 Issue 1 Pages 58-66
Published: January 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (1908K) -
Yo KOJIMA1989 Volume 39 Issue 1 Pages 67-80
Published: January 30, 1989
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (2483K)
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