Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 28, Issue 5
Displaying 1-8 of 8 articles from this issue
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  • Energy saving in automotive industry
    Itaru NIIMI
    1978 Volume 28 Issue 5 Pages 211-212
    Published: May 30, 1978
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.28.211
    JOURNAL FREE ACCESS
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  • Influence of fluid flow on the effect of grain-refining agents in aluminum
    Tadashi MOMONO, Katsuya IKAWA
    1978 Volume 28 Issue 5 Pages 213-219
    Published: May 30, 1978
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.28.213
    JOURNAL FREE ACCESS
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    Aluminum and Al-4.5%Cu alloys into which such hardeners having peritectic constituents as Al-Ti, free from or containing TiC, Al-Zr, Al-V and Al-Cr had been introduced were unidirectionally solidified. The melts were electromagnetically flowing during solidification. The Al-Ti hardener particularly containing TiC has a considerable refining effect. The refining effect is emphasized by fluid flow. Effective grain-refinement with fluid flow requires the formation of an intermetallic compound solidified with wide freezing range and with a large k0 value compared to one at the peritectic reaction. Fluid flow contributes to impeding the showering of grain-refining particles.
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  • Cast structures and mechanical properties of AC7A castings unidirectionally solidified
    Tsuneo SAGA, Shigeru IKEDA
    1978 Volume 28 Issue 5 Pages 220-225
    Published: May 30, 1978
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.28.220
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    Thermal expansion, tensile and fatigue tests were carried out on the castings having different structures. The coefficient of thermal expansion changes with temperature in a similar manner regardless of cast structures and of cooling rates. The castings having a columnar structure show a considerable anisotropic effect on tensile and fatigue properties regardless of cooling rates. This is attributed to the crystallographic orientation and geometry of grain boundaries. The castings having equi-axial crystals are free from anisotropy.
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  • The effect of thermomechanical treatments on the fatigue strength of Al-4%Cu alloy
    Hisashi SUZUKI, Koji HAYASHI, Motoji TSUBOTA
    1978 Volume 28 Issue 5 Pages 226-232
    Published: May 30, 1978
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.28.226
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    The fatigue strength of Al-4%Cu alloy thermomechanically treated was studied mainly from the viewpoints of crack initiation and propagation. The TMT processes included solution treatment at 520°C for 2hr, aging at 15°200°C for 330min, 20% cold rolling, and aging under the same condition as above. Cold rolling and aging were repeated if necessary. The fatigue strength is independent of the grain size of 0.2 to 2.0mm, because the aging structures and the mode of fatigue crack propagation unchange with respect to the grain size. The fatigue strength is increased by TMT only when aged at 150°C. Increase in the strength is attributed to the fact that wavy slip bands instead of usual planar ones, result from finely dispersed (θ"+θ') structure, leading to decrease in the rate of propagation of stage II crack.
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  • Effects of excess magnesium or silicon contents on the aging behavior of Al-1.2%Mg2Si alloy
    Hisashi SUZUKI, Motohiro KANNO, Yasuhisa SHIRAISHI
    1978 Volume 28 Issue 5 Pages 233-240
    Published: May 30, 1978
    Released on J-STAGE: November 05, 2008
    DOIhttps://doi.org/10.2464/jilm.28.233
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    The aging behavior of the alloys containing excess of magnesium or silicon up to about 0.3% was investigated by means of hardness, electrical resistivity and specific heat measurements and high-resolution transmission electron microscopy. The compositions of the alloys were varied so as to be equal in the amount of Mg2Si which would precipitate at aging temperatures. Specimens were solution-treated at 560°C to achieve complete homogeneity. Even the alloys containing excess magnesium are higher in the age-hardenability than the balanced alloy. The fact well corresponds to the structure with finer and denser distribution of needle-shaped G.P. zones in the same way as in the alloys with excess silicon. The alloys containing excess magnesium have a resistance to over aging in contrast to the silicon excess alloys. The cube-shaped precipitates are newly found in the magnesium excess alloys. They appears to be effective for resistance to over aging. Formation of certain G.P. zones is confirmed prior to that of needle-shaped G.P. zones in each alloy.
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  • The effect of annealing temperatures on the compositions of R-orientation in Al-0.04%Fe alloy
    Kunio ITO, Kurt LUCKE
    1978 Volume 28 Issue 5 Pages 241-246
    Published: May 30, 1978
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.28.241
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    Textures of Al-0.04%Fe alloy sheets cold rolled to 95% were measured before and after annealing at exactly the same positions in the sheets. Amounts of retained rolling orientations and orientations formed by <111> 40° related growth in the R-orientation of recrystallization textures were estimated by comparing the annealing textures with their corresponding rolling textures. More growth components are found in the sheets annealed at 520°C than retained ones, but vice versa in the sheets annealed at 400°C. Nearly the same quantities of both components are found in the sheets annealed at 320°C. The results are interpreted by (i) selective retardation of cell boundary migration of cube-orientated nuclei by dynamically segregating iron to moving boundaries at higher temperatures, (ii) inhibitation of grain boundary migration resulting in recrystallization in situ by stable iron precipitates at intermediate temperatures, and (iii) decrease in solute iron in cold rolled matrix due to increasing precipitation and transition of a precipitating phase from stable to metastable one at lower temperatures, which lower the effects of (i) and (ii), respectively.
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  • A consideration on thermal stresses in a composite cylinder made of aluminum alloy and steel with temperature dependency of material constants
    Yoichiro TAKEUTI, Hiroshi NYUKO, Naotake NODA, Shigeo ZAIMA
    1978 Volume 28 Issue 5 Pages 247-252
    Published: May 30, 1978
    Released on J-STAGE: November 05, 2008
    DOIhttps://doi.org/10.2464/jilm.28.247
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    Problems on the thermal stress in hollow circular cylinders of an aluminum alloy/steel composite have been solved using empirical formulae of Young's modulus and thermal expansion coefficient. The thermal stresses in the composite cylinders considerably increase in an elevated temperature range, even if the same temperature difference is maintained between inside and outside surfaces of the cylinders.
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  • Supply and demand of aluminum industry during 1977 in Japan
    Japan Light Metal Association, Economical Research
    1978 Volume 28 Issue 5 Pages 253-259
    Published: May 30, 1978
    Released on J-STAGE: November 05, 2008
    DOIhttps://doi.org/10.2464/jilm.28.253
    JOURNAL FREE ACCESS
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