Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 46, Issue 4
Displaying 1-7 of 7 articles from this issue
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RESEARCH REPORT
  • Application of temperature-resistivity diagram calculated from binary solubility curves to commercial Al–Zr–Fe–Si alloy
    Takeshi IKEDA, Takashi TACHIKAWA, Masahiko IKEDA, Shin-ya KOMATSU
    1996 Volume 46 Issue 4 Pages 165-170
    Published: 1996
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.46.165
    JOURNAL FREE ACCESS
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    The measured resistivity changes of Al–0.35 mass%Zr–0.15 mass%Fe–0.05∼0.15 mass%Si commercial alloys by long period accumulative heat treatment were compared with the Temperature-Resistivity diagrams (T–ρ diagrams), calculated from solubility curves of binary alloy systems (Al–x, x=Zr, Fe, Si), to estimate the effect of Si content on the solubility of Zr in Al. In the accumulative treatment of the wires above 723 K after heat treatment at 723 K for 180 ks and cold drawing, resistivity increases by the re-dissolution of Fe and Zr. In this re-dissolution stage, resistivity reaches nearly a constant for each annealing temperatures by prolonged heating. The tendency of the changes of these constant resistivities ρ77 with annealing temperature T coincides with that of the calculated resistivities in T–ρ diagrams. Because the T–ρ diagrams are calculated under assumption of no interaction between solute atoms of different species, this coincidence suggests that the effect of Si addition up to 0.15 mass% on the solubility of Zr is negligibly small.
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  • Production of Al–4.5 mass%Cu alloy by transient liquid phase sintering
    Masayoshi OZAWA, Hiroshi KIMURA, Tadashi MOMONO, Hiroshi G. KATAYAMA
    1996 Volume 46 Issue 4 Pages 171-176
    Published: 1996
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.46.171
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    The transient liquid phase (TLP) sintering of Al–4.5 mass%Cu alloy using pure Al powder and Cu powders has been made. In the present investigation, hot pressing was used for the TLP from above the eutectic temperature (821 K) to under it (solid state (SS) sintering) to reveal the effect of liquid phase on sintering characteristics. As a result, the microstructures were composed of α–Al solid solution and CuAl2 (θ–phase) in any conditions. We confirmed that the characteristic structures which consisted of Cu-poor phase in the vicinity of grain boundaries of α–Al solid solution. The θ–phase formed at the grain boundary by the SS sintered alloy was more continuous than that of the TLP sintered alloy. On the other hand, the Vickers hardness of the SS sintered alloy was slightly larger than that of the TLP sintered alloy. However, the tensile strength, the elongation and the reduction of area of the TLP sintered alloy were higher than on the SS sintered alloy. These results indicate that the liquid phase formed during sintering accelerates effectively the sintering process.
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  • Measurement of strain rate near cutting edge by image processing on micro-cutting commercially pure aluminum in SEM
    Shinsaku HANASAKI, Jyunsuke FUJIWARA, Takeshi MIYAMOTO
    1996 Volume 46 Issue 4 Pages 177-182
    Published: 1996
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.46.177
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    This paper visualizes the cutting mechanism of A1100–H18 and A1100–O of commercially pure aluminum for the measurement of the strain rate distribution near a cutting edge in orthogonal cutting. The distribution is measured using various methods in order. The methods are in-situ observation of cutting process in SEM, inputting image data, a computer image processing, calculating displacements by SSDA (Sequential Similarity Detection Algorithm) and calculating strain rates by FEM. The main results obtained are as follows: (1) It enables to measure a microscopic displacement near a cutting edge. (2) Cutting mechanism was made clear by measuring a strain rate distribution. (3) In cutting A1100–O, small fluctuations of the strain rate distribution were observed.
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  • The recovery of aluminum from aluminum matrix composites by a molten salt process
    Tetsuo INOUE, Hiroshi INAYOSHI, Hideyuki KANEMATSU, Yoshihiko KUNIEDA, ...
    1996 Volume 46 Issue 4 Pages 183-188
    Published: 1996
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.46.183
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    In order to develop the recycling process of aluminum, the recovery of aluminum and the removal behaviors of reinforced materials from aluminum matrix composites have been investigated experimentally by using molten salt process, and its mechanism have been discussed. Si3N4/2024 and SiC/6061 aluminum composites SiC/Al–Si alloy composite containing K2TiO3 and Al2O3 were used samples. These aluminum matrix composites were treated in equimolar KCl–NaCl molten salts involving NaF, KF and LiF at 1033 K and the extent of the separation of various components was measured by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electron probe microanalysis (EPMA) respectively. The results indicated that various components of the composite specimens were eliminated from these composites by being transferred into molten salts. The extent of elimination of carbide and nitride components was different from oxide components, such as Al2O3.
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  • Effect of Fe and Ni addition on microstructure and mechanical properties of PM 2024 aluminum alloys
    Kenji MATSUKI, Tsutomu KIMOTO, Shang XIANG, Mitsugu TOKIZAWA, Takamasa ...
    1996 Volume 46 Issue 4 Pages 189-194
    Published: 1996
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.46.189
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    2024Al–3Fe–Ni alloy powders with nominal Ni contents of 0, 3, 5 and 10 mass% were produced by an air atomization technique, and consolidated to a full density by the cold isostatic pressing and hot extrusion at 723 K. The effect of Ni content on the improvement of mechanical properties of the extrudates has been investigated at temperatures from ambient temperature to 573 K, related with microstructure changes of the alloy powders and extrudates. By means of the X-ray diffraction for the powders, constituent phases of Al9FeNi and Al3Ni were identified in the specimens containing Ni higher than 3 mass% and 5 mass% respectively, while both phases of Al3Fe and Al7Cu2Fe were also identified for all alloys. The Al9FeNi phase was found to be solidified as a very fine eutectic compound with the α–Al. The amount of the eutectic microstructure was maximum in the powders with 5 mass%Ni. After extrusion at 723 K, the four alloys exhibited almost round shape intermetallic particles with diameters less than about 0.3 μm. The average particle size was minimum at 5 mass%Ni content at 573 K. The tensile strength of the extrudats increased linearly with Ni content at each testing temperature, although the extrudate with 10 mass%Ni addition showed extremely poor ductility at temperatures lower than 373 K. The tensile strength at high temperatures was discussed based on the attractive interaction between dislocations and dispersed particles.
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