Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 38, Issue 9
Displaying 1-9 of 9 articles from this issue
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  • Fabrication of potassium titanate whisker/aluminum composites and some their properties
    Yoshinori NISHIDA, Tsunemichi IMAI, Mamoru YAMADA, Hiromi MATSUBARA, I ...
    1988Volume 38Issue 9 Pages 515-521
    Published: September 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.515
    JOURNAL FREE ACCESS
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    Tensile and wear tests and measurements of specific heat and thermal conductivity were carried out on potassium titanate whisker reinforced aluminum composites fabricated by squeeze casting. The reaction of whiskers to molten metals can be prevented by rapid solidification. No degradation of whiskers and their planar random array in the composites are revealed by electron probe microanalyses. One of the most significant feature of the composites is excellent machinability by the use of ordinary tools.
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  • Structure of chill crystals in Al-4.5%Cu alloy ingots
    Izumi MURASHIMA, Hiromasa TAKEUCHI, Yasuo KIMURA
    1988Volume 38Issue 9 Pages 522-527
    Published: September 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.522
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    Optical micrography was performed on the structure of chill crystals in Al-4.5%Cu alloy ingots unidirectionally solidified. Electron probe microanalysis was also carried out on the solute concentration in chill crystals in order to make clear the growth of discs and predendrites. The formation of discs from the melt is governed by heat transfer coefficient at the melt-chill block interface. The morphological change from disc to predendrite depends on the growth rate and thermal gradient at the interface. Dendrites in a chill crystal grow in the direction opposite to the heat flow.
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  • Design and assembling of single roll apparatus for rapid solidification and characteristics of wide Al-Si eutectic alloy foils solidified
    Mitsugu MOTOMURA, Toshio HAGA, Yoshito SAKURAI
    1988Volume 38Issue 9 Pages 528-533
    Published: September 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.528
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    A single roll unit for rapid solidification of wide aluminum foils was designed and assembled. A nozzle having 0.5×160mm slit is attached to the bottom of crucible. The nozzle is dividable into two blocks at the slit. A water cooled copper roll 300mm in diameter and 200mm in width can be rotated at 0 to 4000rpm. The nozzle has 6 positional freedoms for the roll to investigate influences of the nozzle position on the foil formation. Al-12 wt%Si alloy 1kg melted in air in a crucible was poured onto the roll through the slit. Foils uniform in width at 160mm of the nozzle width and in thickness are successfully prepared. Diagrams to estimate dependences of such fundamental factors as rotating speed of the roll and ejection pressure on the thickness and quality of foils are drawn. The foil has tensile strength higher in the longitudinal direction than that in the transverse direction.
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  • Rerative position of nozzle to roll as a forming factor in single roll rapid solidification of eutectic Al-Si alloy foils
    Mitsugu MOTOMURA, Toshio HAGA, Yoshito SAKURAI
    1988Volume 38Issue 9 Pages 534-539
    Published: September 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.534
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    Producing eutectic Al-Si alloy foils 160mm in width was at temptedby the use of a single roll splat cooling apparatus, in which relative nozzle-roll positions, ie. injection angle from 55°to 110°, nozzle-distance 0.5 to 50mm, nozzle-roll shaft skew angle 0°to 5°and degree of parallel between nozzle and roll surface 0°to 5°were controlled. When the injection angle is 90°, sound foils can be made within an extended range of thickness. The foil thickens at acute injection angles. The uniformity of thickness in the cross section is achieved by decreasing the nozzle-roll distance and nozzle-roll shaft skew angle and by increasing degree of parallel to nozzle-roll surface. The optimum nozzle-roll position includes 90° of injection angle, minimum nozzle-roll distance, 0° of nozzle-roll skew angle, and parallel setting of nozzle to roll.
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  • Effects of copper and magnesium additions on tensile deformation behaviour at elevated temperatures of aluminum PM-alloys containing Fe and Zr
    Anders P. SODERGREN, Jun SHIMIZU, Osamu IWAO
    1988Volume 38Issue 9 Pages 540-545
    Published: September 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.540
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    Tensile tests at temperatures from 25°C to 490°C and initial strain rates from 10-4 to 10-1•s-1 were carried out on Al-3%Fe-1.5%Zr alloys to which Cu and Mg had been added by 1.5%, respectively. The strength increases at low temperatures below 200°C and decreases at high temperatures above 370°C, and the ductility is improved over a range of elevated temperatures. These effects are attributed to differences in work hardening rate, recovery rate and necking behavior among the alloys. The tensile elongation at high temperatures and low strain rates is governed by the formation and growth of voids.
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  • Orthogonal hot machining for hypereutectic Al-Si alloys
    Yoshio HASEGAWA, Shinsaku HANASAKI, Mutsumi TOUGE
    1988Volume 38Issue 9 Pages 546-551
    Published: September 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.546
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    Orthogonal cutting tests of hypereutectic Al-Si alloys were carried out at elevated temperatures up to 770K. Al-16 to 26%Si alloys recrystallize at about 600K. The average diameter, number and area percentage of primary Si particles increase linearly with an increase in Si content in the alloys. These particles are finely crushed by cutting at 300K. Crushed and/or fine grained particles gradually decrease at elevated machining temperatures. The cutting force moderates at elevated machining temperatures by the reduction of flow stress in the matrix. The friction angle increases gradually and the shear angle decreases at elevated temperatures. These facts are attributed to increases in τc/τs and contact length of chips with the tool face.
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  • Aluminum foils for electrolytic capacitors from the stand point of capacitor manufacturers
    Izaya NAGATA
    1988Volume 38Issue 9 Pages 552-557
    Published: September 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.552
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  • Al-Cu alloys
    Tatsuo SATO, Sanji KITAOKA, Akihiko KAMIO
    1988Volume 38Issue 9 Pages 558-578
    Published: September 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.558
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  • Change of environment
    Isao MIKI
    1988Volume 38Issue 9 Pages 579-580
    Published: September 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.579
    JOURNAL FREE ACCESS
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