Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 31, Issue 10
Displaying 1-10 of 10 articles from this issue
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  • Scientific Approach
    Tsuyoshi HIRAMATSU
    1981 Volume 31 Issue 10 Pages 635-636
    Published: October 30, 1981
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.31.635
    JOURNAL FREE ACCESS
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  • Prevention of shrinkage porosity in aluminium alloy castings using solidification state diagram
    Tohru YODA, Yoshio SUGIYAMA, Motoyuki NAKAMURA
    1981 Volume 31 Issue 10 Pages 637-643
    Published: October 30, 1981
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.31.637
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    Solidification state diagrams showing the movement of solidification fronts were constructed from multipoints temperature measurements in a casting to predict the anticipated locations of shrinkage together with the specific gravity distribution diagram. The prediction well agrees with the location of shrinkage porosities in practical castings. The solidification state diagrams of AC2B plate castings at solid fractions 0.75 and 1.0 are different from those at 0.25 and 0.5. The area in which coarse shrinkage porosities are formed corresponds to the area surrounded by a closesloop isochronic line in the solidification state diagram at the solid fraction 0.5. Enlargement of the riser neck is succesfully applicable to open the closed-loop line and to prevent the shrinkage porosities without changing the riser weight.
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  • Energy dispersion spectroscopy of pre-existing hydrogen embrittled zone ahead of stress corrosion cracks
    Kenji HIGASHI, Tadakazu OHNISHI, Yoshizo NAKATANI
    1981 Volume 31 Issue 10 Pages 644-648
    Published: October 30, 1981
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.31.644
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    Scanning electron microscopy and energy dispersion spectroscopy were made on the fracture of Al-8%Mg alloy failed under tensile loading after stress corrosion testing. When the alloy is faillured imediately after stress corrosion testing, a wide range of intergranular cracking area is observed which consists of two zones with and without the corrosion trace of chloride. The latter disappears when the alloy is aged at room temperature after stress corrosion testing, because the permeated hydrogen is diffused out. The former region corresponds to the SCC zone and the latter does to the hydrogen embrittled zone. The propagation of stress corrosion cracks is attended with forming the pre-existing hydrogen embrittled zone.
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  • Effects of small addition of Si on the precipitation of Al-Hf alloys
    Shigenori HORI, Norio FURUSHIRO, Wataru FUJITANI
    1981 Volume 31 Issue 10 Pages 649-654
    Published: October 30, 1981
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.31.649
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    Hardness measurements and electron microscopies were made on the cill cast Al-2 to 3% Hf alloys containing 0.1 to 0.5% Si isothermally aged at 350° to 500°C. Si in the alloys accelerates precipitation considerably. The acceleration of age hardening is attributed to the acceleration of nucleation of spherical metastable particles by Si atoms within a grain. Si in the alloys also suppresses entirely the grain boundry reaction. A new kind of intermediate (H) phase is found in the precipitating course from a metastable phase having L12 structure to equilibrium one.
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  • Fracture toughness of Al-5%Si-1.3%Cu-0.5%Mg alloy castings
    Michihiro TAGAMI
    1981 Volume 31 Issue 10 Pages 655-659
    Published: October 30, 1981
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.31.655
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    Effects of aging treatment, Si contents and Ti addition on the fracture toughness of Al-5%Si-1.3%Cu-0.5%Mg alloy castings were studied by a double torsion-bend test. The fracture toughness is appreciably affected by the aging treatment. The casting aged for 10h at 142°C has the highest fracture toughness over the range of test temperatures. Increasing Si contents from 5% to 9% results in decrease of fracture toughness by 28%. Addition of 0.1% Ti has little effect fracture toughness. The fracture toughness varies according to the variation of parameter n√σy derived from the tensile test when aged under different conditions.
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  • Some Considerations on the Carbide Tool Wear in Wet Cutting of Aluminum Alloys
    Shigeo ZAIMA, Yuzo TAKATSUJI, Hiroki OKUSHIMA, Shigeru YAMADA
    1981 Volume 31 Issue 10 Pages 660-667
    Published: October 30, 1981
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.31.660
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    Wet cutting tests of wrought and cast aluminum alloys 7075-T6 and AC3A were carried out using P10 and K10 carbide tools. Eelctron probe microanalyses were made on the tool face worn at different stages of cutting. The face of P10 and K10 tools near the tool edge worn by cutting 7075-T6 and the face of a P10 tool grooving worn by cutting AC3A lie wast and reduce the Co concentration. When the built-up edge-like deposits on the tool edge fall off in cutting 7075-T6, the pressure welding wear acting to carry away the sintered particles and Co results in dilution of Co on the worn tool face. The crater on both tools which have cut 7075 and the grooving wear face on the K10 tool which has cut AC3A are smoothened and rich in Co, probably because of the scratching wear acting. The K10 tool is stronger than P10 in cutting aluminum alloys.
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  • Acoustic emission generated during tensile and cyclic stress testing of 5052 aluminum alloys
    Hajime KATOH, Tatsumi TOZAWA
    1981 Volume 31 Issue 10 Pages 668-674
    Published: October 30, 1981
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.31.668
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    Acoustic emission behaviors during plastic and cyclic deformation were investigated for the commercial 5052 alloys heated at 400°C for 4h and furnace cooled, air cooled and water quenched. A high acoustic emission activity is observed during the deformation near the yield point. It reduces with the increment in plastic strain. The acoustic activity in plastic deformation intensifies as the cooling rate slowers. The same tendency is also found in fatigue tests. The difference of the activity between the specimens during fatigue crack growth is attributed to a microscopic mechanism in the stage where a plastic zone forms at crack tip.
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  • Hgh purity aluminum foil for electrolytic capacitor
    Kozo ARAI, Takao SUZUKI
    1981 Volume 31 Issue 10 Pages 675-682
    Published: October 30, 1981
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.31.675
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  • Corrosion of Aluminum
    Goro ITOH
    1981 Volume 31 Issue 10 Pages 683-696
    Published: October 30, 1981
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.31.683
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  • Erratum
    1981 Volume 31 Issue 10 Pages e2
    Published: 1981
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.31.10_e2
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