Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
Volume 40, Issue 10
Displaying 1-11 of 11 articles from this issue
  • Sachiko ONO, Nobuyoshi BABA
    1990 Volume 40 Issue 10 Pages 729-736
    Published: October 30, 1990
    Released on J-STAGE: October 30, 2008
    JOURNAL FREE ACCESS
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  • Takao MURAKAWA
    1990 Volume 40 Issue 10 Pages 737-745
    Published: October 30, 1990
    Released on J-STAGE: October 30, 2008
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  • Fukuhisa MATSUDA
    1990 Volume 40 Issue 10 Pages 746-752
    Published: October 30, 1990
    Released on J-STAGE: October 30, 2008
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  • Kiyotada YASUHARA
    1990 Volume 40 Issue 10 Pages 753-760
    Published: October 30, 1990
    Released on J-STAGE: October 30, 2008
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  • Shigeki SHIMIZU, Kensuke NAGAI, Fukuhisa MATSUDA, Kazuhiro NAKATA
    1990 Volume 40 Issue 10 Pages 761-767
    Published: October 30, 1990
    Released on J-STAGE: October 30, 2008
    JOURNAL FREE ACCESS
    Effect of carbide addition on the surface characteristics of aluminum alloy 5083 has been investigated with the plasma transferred arc welding process (DCSP) of NbC, TiC or SiC powder. Optimum overlaying conditions under which bead appearance is superior and porosities in overlaid metal are lesser are determined. Moreover some characteristics of overlaid metal containing carbide are evaluated under these optimum conditions. The results are summarized as follows: (1) The maximum area fraction of carbide in overlaid metal is about 40% for NbC and TiC, and about 30% for SiC, (2) Vickers hardness of overlaid metal containing carbide is in the range between 111 and 141hgf/mm2, (3) Abrasive resistance of overlaid metal at higher sliding speed is remarkably improved by the addition of carbide although that at lower sliding speed is not almost improved, (4) In the 180 degree bend test, cracks appear not in the boundary layer between overlaid and base metals but only in overlaid zone, meaning that the boundary layer is sound enough for ductility.
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  • Shigeo OHIRA, Masaya IWAKI
    1990 Volume 40 Issue 10 Pages 768-774
    Published: October 30, 1990
    Released on J-STAGE: October 30, 2008
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    The surface properties such as depth profile, chemical bond, and structure, and electrical properties of oxide and nitride layers in aluminum produced by high dose implantation of oxygen and nitrogen ions were investigated. High dose of oxygen (4×1018ions/cm2) and nitrogen (2×1018ions/cm2) molecule ions were implanted into polycrystalline and single crystal aluminum sheets using low current densities of 150keV at room temperature. The implanted layers were characterized by means of AES, XPS, X-ray and transmission electron diffraction, transmission electron microscopy, and IR spectroscopy. The electrical resistivity and breakdown electric field strength of oxide and nitride layers were measured by current-voltage characteristics. It was found that high dose oxygen ion implantation produces microcrystalline γ-Al2O3, whereas implanted nitrogen leads to polycrystalline or single crystal AlN layers at room temperature without any thermal annealing, and it is possible to form electrically insulating layers in aluminum using this technique.
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  • Fukuji INOKO, Hideyuki KOH, Yoshirou KOJI, Yutaka OGURA, Takuo HARA, Y ...
    1990 Volume 40 Issue 10 Pages 775-779
    Published: October 30, 1990
    Released on J-STAGE: October 30, 2008
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    The plasma spraying coatings of Al2O3, 3%TiO2-Al2O3, 13%TiO2-Al2O3, TiO2 and partially stabilized ZrO2 films on aluminum alloys have been carried out. 13%TiO2-Al2O3 coating shows the best results in the tests of various bendings. The formation of main cracks are clearly detected by the comparison of the bending stress-strain curves of specimens coated with ceramics on tension side and those on compression side. The brittleness of the ceramics coatings is evaluated by the bending test of the specimens without undercoatings.
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  • Sachiko ONO, Hideki ICHINOSE, Tomoko KAWAGUCHI, Noboru MASUKO
    1990 Volume 40 Issue 10 Pages 780-786
    Published: October 30, 1990
    Released on J-STAGE: October 30, 2008
    JOURNAL FREE ACCESS
    The structure of porous anodic films formed on aluminum in chromic acid solution and their crystallization behavior during electron beam irradiation have been investigated by using high resolution electron microscopy. Crystals nucleated preferentially at triplicate cell boundaries but occasionally in the vicinity of pore walls. Subsequent crystal growth proceeded rapidly and smoothly. The crystallization was completed within 10min under the ordinary operating condition of the microscope. The crystals were large in size and small in number. This is explained by the structural uniformity of cell walls which is due to the small amount of incorporated species in the film except on the cell boundaries and in the vicinity of pore walls. The structure of the oxide on triplicate cell boundaries was different from the typical amorphous phase of cell walls. The difference is attributed to both the high electric field and the heat of electric breakdown between pore vases and metal ridges at the triplicate connections of semispherical cell vases. The featherlike pore walls of the film is explained by the drilling and healing effect of breakdown. High resolution lattice images revealed that the crystallized film consisted of three areas, i.e., highly crystallized area, incomplete crystalline area and hardly crystallized area near pore walls.
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  • Hideaki USHIO, Tadayoshi HAYASHI, Kazuo SHIBATA, Masuo EBISAWA
    1990 Volume 40 Issue 10 Pages 787-792
    Published: October 30, 1990
    Released on J-STAGE: October 30, 2008
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    Alumina short fiber and carbon short fiber reinforced aluminum composites were fabricated by squeeze casting. Tensile and sliding tests and metallography of the composites were carried out. It was revealed that hybrid fiber composites of alumina and carbon fibers had good sliding properties, especially under dry conditions. Crystallinity of the carbon fiber showed important effects to the composite properties. It was revealed that composite engine blocks were of light-weight and high performance compared with other mass-produced engine blocks.
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  • Hajime ISHIMARU
    1990 Volume 40 Issue 10 Pages 793-802
    Published: October 30, 1990
    Released on J-STAGE: October 30, 2008
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  • Tatuuya TSURUMI
    1990 Volume 40 Issue 10 Pages 803-804
    Published: October 30, 1990
    Released on J-STAGE: October 30, 2008
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