Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
Search
Advanced search
OR
Browse
Search
Volume 38, Issue 8
Displaying 1-10 of 10 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • Effects of solidification variables on microstructures of Mg-2.4%Ag-1.5%RE-0.65%Zr alloy unidirectionally solidified
    Shigeharu KAMADO, Makoto TSUKUDA, Ichirou TOKUTOMI, Kikou HIROSE
    1988 Volume 38 Issue 8 Pages 449-454
    Published: August 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.449
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Such solidification variables as liquid cooling rate (VLC), average cooling rate in the solidification range (VSC), temperature gradient (G) and moving velocity of solid-liquid interface (R) were measured in Mg-2.4%Ag-1.5%RE-0.65%Zr alloy. The solidified alloy has equiaxed structures caused by a grain refining effect of Zr. The equiaxed grain size is affected so strongly by VLC that the size exponentially decreases with a rise in VLC. The amount of Mg-RE-Ag eutectic compound increases at accelerated R. The interface assumes a shape elongated from a triple junction of grain boundaries with increase of VLC or with decrease in G and increase in R. The amount of eutectic compound in the alloy decreases by T6 treatment and remains at the triple junction, though the equiaxed grain size unchanges. The compound transforms from rodlike to granular as VLC accelerates.
    View full abstract
    Download PDF (1513K)
  • Effects of solidification varoina bmleecsh anical properties of Mg-2.4%Ag-1.5%RE-0.65%Zr alloyu nidirectionalsloyl idified
    Shigeharu KAMADO, Makoto TSUKUDA, Ichirou TOKUTOMI, Kikou HIROSE
    1988 Volume 38 Issue 8 Pages 455-461
    Published: August 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.455
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Effects of such solidification variables as liquid cooling rate (VLC), average cooling rate in the solidification range (VSC) temperature gradient (G) and moving velocity of solid-liquid interface (R) on mechanical properties of cast and T6-treated Mg-2.4%Ag-1.5%RE-0.65%Zr alloys were studied. Crack propagation energy and total absorbed energy of the cast alloy are strongly affected by VSC, and the other mechanical properties by R. These mehanical properties are improved by lowering these solidification variables. Mechanical properties of the T6-treated alloy other than crack initiation energy are significantly affected by VLC or VSC and are improved by promoting these solidification variables.
    View full abstract
    Download PDF (918K)
  • Structure of aluminum oxide films and their gas desorption properties
    Yutaka KATO, Eizo ISOYAMA, Minoru HASEGAWA
    1988 Volume 38 Issue 8 Pages 462-467
    Published: August 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.462
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Relation between structure of aluminum oxide films on 6063 alloy and their gas desorption property was studied. 6063 alloy etched in alkali solution shows outgassing rates 4.2×10-9torr•l/s•cm2 at 10h after initial evacuation at room temperature and 1.0×10-12torr•l/s•cm2 at 10h after baking at 100°C for 24h. The alloy etched in alkali solution, dried in vacuum and heated in Ar+O2 mixture gas shows outgassing rates 3.2×10-10torr•l/s•cm2 at 10h after initial evacuation at room temperature and 3.9×10-12torr•l/s•cm2 at 10h after baking at 100°C for 24h. The alloy extruded in Ar+O2 mixture gas shows the same outgassing rates. Porous hydrated oxide films are formed on the alloy etched in alkali solution and stored in air. The formation of hydrated oxide films during storage in air is controlled by heating in vacuum and in the Ar+O2 mixture gas after alkali etching. Hydrated oxide films affect outgassing rates.
    View full abstract
    Download PDF (1309K)
  • CO2 laser light absorptivities of cast aluminum alloys
    Jun KUROBE, Hiroshi SAKUTA, Toshio SUZUKI, Yasunori MIYATA, Yukio ICHI ...
    1988 Volume 38 Issue 8 Pages 468-472
    Published: August 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.468
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Absorptivities of cast aluminum alloys for CO2 laser light were determined in two different methods, by measuring the power reflected from the surface of the alloys and by measuring temperature rise of the alloys during irradiation. When the surface of an alloy is so fine, absorptivities determined by the two methods are nearly equal to each other. The absorptivity of the alloys depends on the surface roughness and the contents of alloying elements. Roughening of the surface and the increase of alloying elements cause an increase in absorptivity.
    View full abstract
    Download PDF (596K)
  • Effect of aging treatment on serrated yield of Al-10%Mg alloys
    Susumu IKENO, Hiroyuki URANO, Yasuhiro UETANI, Shizuo TADA
    1988 Volume 38 Issue 8 Pages 473-478
    Published: August 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.473
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Tensile test, scanning and transmission electron microscopies and electrical resistivity measurement of Al-10%Mg alloy were performed. Mg concentration within the matrix of the alloys decreases from 9.5 to 6.4% by aging at 250°C. Total elongation at 0°C once decreases and then increases with progressing of aging time. The serrated yield is observed on the load-elongation curves for the under and over-aged alloys. The serrated yield disappears for the peak-aged alloys which have nearly the minimum elongation.
    View full abstract
    Download PDF (1245K)
  • Effects of casting conditions on microstructure and mechanical properties of Al-7%Si-0.3%Mg-0.1% Sb casting alloys
    Mitsuru ADACHI, Akira OISHI, Atsushi MORIBE, Ryoji TANAKA
    1988 Volume 38 Issue 8 Pages 479-484
    Published: August 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.479
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Molten Al-7%Si-0.3%Mg-0.1%Sb alloys were held for different times, cast at different temperatures and cooled during solidification at different rates. As the alloys are cast at lower temperatures and cooled at accelerated rates, a greater proportion of acicular and rod type Mg-Sb compounds crystallizes. And as the alloys are cast at lower temperatures and cooled at moderated rates, the tensile strength, impact strength and elongation of the cast alloys lower.
    View full abstract
    Download PDF (1764K)
  • Trends of surface modification of aluminum
    Takao MURAKAWA
    1988 Volume 38 Issue 8 Pages 485-495
    Published: August 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.485
    JOURNAL FREE ACCESS
    Download PDF (1500K)
  • Al-Mg alloys
    Hideo YOSHIDA, Toshiyasu FUKUI
    1988 Volume 38 Issue 8 Pages 496-512
    Published: August 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.496
    JOURNAL FREE ACCESS
    Download PDF (3453K)
  • Research works in university and cooperation with industry
    Toshiro KOBAYASHI
    1988 Volume 38 Issue 8 Pages 513-514
    Published: August 30, 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.513
    JOURNAL FREE ACCESS
    Download PDF (261K)
  • Erratum to : Aluminum and cans
    1988 Volume 38 Issue 8 Pages ivb
    Published: 1988
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.38.8_ivb
    JOURNAL FREE ACCESS
    Download PDF (104K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top