Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 61, Issue 1
Displaying 1-7 of 7 articles from this issue
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RESEARCH REPORT
  • Rolling wear characteristic of composite material fabricated from aluminum alloy powder and aluminum sludge by spark plasma sintering
    Yasuyuki Kanda, Isao Fukumoto
    Article type: Research Report
    2011 Volume 61 Issue 1 Pages 2-8
    Published: January 30, 2011
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.2464/jilm.61.2
    JOURNAL FREE ACCESS
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    We have investigated the rolling wear characteristic of composite material fabricated from aluminum alloy powder and α alumina (Al2O3) sludge by spark plasma sintering. The experimental results were verified by the analysis of shear stress distribution under Hertz contact pressure using Finite Element Method (FEM). These results were obtained as following: (1) The rolling wear stage was classified with three stages. The rolling wear volumes of composite materials were improved by adding the sludge to aluminum alloy powder. (2) The occurrence of crack from bottom of pit was propagated along avoiding sludge. (3) From calculating the shear stress distribution under Hertz contact pressure using FEM, maximum shear stress value of composite material including sludge showed same value of aluminum alloy powder only. (4) From the analysis of the crack occurrence and propagation from bottom of pit of composite material included sludge, maximum shear stress was decreased due to the interference effect of stress concentration. Therefore, sludge of composite material has the inhibitive effect of crack occurrence and propagation from bottom of pit.
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  • Effect of magnesium addition on age hardening in Al–Si system alloy castings
    Mitsuaki Furui, Tatsuya Ishikawa, Susumu Ikeno, Masaki Miura, Seiji Sa ...
    Article type: Research Report
    2011 Volume 61 Issue 1 Pages 9-13
    Published: January 30, 2011
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.2464/jilm.61.9
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    Al–Si eutectic alloys have excellent castability and sufficient strength when combined with other alloying elements. Especially, Al–Si alloy containing Mg, used for high-quality die-casting, is well-known as a high strength alloy created by appropriate heat treatment and consequential precipitation hardening of Mg2Si intermediate phase. To understand the age hardening behavior of Al–10 mass%Si–0.5 mass%Mg and Al–10mass%Si–0.8mass%Mg alloys in detail, microstructure observation and hardness measurement were performed. These alloys quenched in iced water, naturally aged at room temperature and artificially aged at 423–523 K, showed conspicuous age hardening behavior. The age hardening curve from the theoretical hardness by the composite rule almost agreed completely with the age hardening curve from the measurement. Consequently, it's thought that the age hardening of these alloys is composed with the change of hardness in alpha Al and the eutectic phases of Al+Si.
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  • Mechanical properties of friction stir welded 2024 aluminum alloy joint
    Masashi Takahashi, Kazuyoshi Katoh, Hiroshi Tokisue
    Article type: Research Report
    2011 Volume 61 Issue 1 Pages 14-19
    Published: January 30, 2011
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.2464/jilm.61.14
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    2024-T351 aluminum alloy plate with 5 mm thickness was friction stir welded using two kinds of probe shape which are a left screw (LS) and cone with the curvature (CR). The microstructures and mechanical properties of the welded joint were investigated. Regardless of both welding conditions and probe shapes, the microstructures of stirred zone showed finer than that of the base metal. Hardness of weld zone of both joints showed lower than that of the base metal. The hardness of stir zone was restored 80%~100% of base metal. Tensile strength of LS joint showed about 90% of the base metal, and its CR joint showed about 70% of the base metal. The fatigue limit of LS joint showed about 90% of the base metal, and its CR joint showed about 80% of the base metal.
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  • Simulation of collision behavior on magnetic pressure seam welding of aluminum sheets
    Makoto Miyazaki, Kuniaki Sasaki, Masaki Okada
    Article type: Research Report
    2011 Volume 61 Issue 1 Pages 20-23
    Published: January 30, 2011
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.2464/jilm.61.20
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    This paper deals with dynamic deformation process on magnetic pressure seam welding of aluminum sheets. Numerical analysis of the dynamic deformation process of the aluminum sheets is made by a finite element method. In this analysis, the metal sheets (100 mm width, 1 mm thickness) are modeled with plane-strain quadrilateral elements. A collision point velocity between the aluminum sheet surfaces was very high at an initial collision point, but it decreased continuously during the welding. A collision angle between the aluminum sheet surfaces was 0 degree at an initial collision point, but it increased continuously during the welding. The collision angle in a double-sided magnetic pressure seam welding process increased more quickly than that in a single-sided magnetic pressure seam welding process.
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  • Fabrication of hydroxyapatite film on Ti–29%Nb–13%Ta–4.6%Zr using a MOCVD technique
    Harumi Tsutsumi, Mitsuo Niinomi, Masaaki Nakai, Tatsuya Gozawa, Toshik ...
    Article type: Research Report
    2011 Volume 61 Issue 1 Pages 24-29
    Published: January 30, 2011
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.2464/jilm.61.24
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    A hydroxyapatite (HAp) film was fabricated on the surface of Ti–29Nb–13Ta–4.6Zr (TNTZ) using a metal-organic chemical vapor deposition (MOCVD) technique, and the mechanical biocompatibility and HAp formability of HAp-coated TNTZ were evaluated and discussed in this study. HAp film is fabricated on the surface of TNTZ by controlling the heating temperature of the source bis-dipivaloylmethanatocalcium ((Ca(dpm)2) and (C6H5O)3PO). An α-phase precipitates in the TNTZ matrix after heating the substrate, and the mechanical properties and Young's modulus of HAp-coated TNTZ are improved. HAp-coated TNTZ maintains excellent mechanical biocompatibility. The formability of HAp on HAp-coated TNTZ in Hank's balanced salt solution is better than that of HAp on non-coated TNTZ.
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