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 65, Issue 7
Displaying 1-5 of 5 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
RESEARCH ARTICLE
  • Recrystallization process and texture change of Mg–Y alloy rolled sheet
    Tetsu Suzuki, Daisuke Ando, Yuji Sutou, Junichi Koike
    Article type: RESEARCH ARTICLE
    2015 Volume 65 Issue 7 Pages 259-262
    Published: July 30, 2015
    Released on J-STAGE: August 30, 2015
    DOIhttps://doi.org/10.2464/jilm.65.259
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    This paper reports the texture weakening associated with the characteristic recrystallization processes of cold-rolled and hot-rolled Mg–Y alloy during annealing at 400°C. After rolling, severely strained regions were formed along grain boundaries for the cold-rolled samples and across neighboring grains for the hot-rolled samples. In the severely strained regions, the cold-rolled sample showed the presence of the ⟨c+a⟩ dislocations, while the hot-rolled sample showed the formation of multiple twins. The results suggested that the texture weakening after annealing was due to the formation of nucleation site for recrystallization near boundaries by the high activity of the ⟨c+a⟩ dislocations in the cold-rolled sample. Meanwhile, in the hot-rolled sample, it was due to the formation of multiple twins which acted as the nuclei of recrystallized grains.
    View full abstract
    Download PDF (6319K)
  • Effect of intermediate annealing condition on tensile properties and recrystallization behavior on continuous cast Al–Mn series alloy fin stocks
    Kenta Suzuki, Tomohiro Sasaki, Yasushi Oowada, Toshiya Anami
    Article type: RESEARCH ARTICLE
    2015 Volume 65 Issue 7 Pages 263-268
    Published: July 30, 2015
    Released on J-STAGE: August 30, 2015
    DOIhttps://doi.org/10.2464/jilm.65.263
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The influence of an intermediate annealing condition on the tensile properties and recrystallization behavior of continuous cast Al–Mn series alloy fin stock specimens for automotive heat exchangers was studied. After brazing, when compared with a batch-type furnace, the intermediate annealing of the specimens in a salt bath furnace attractively resulted in high tensile strength and large recrystallized grain structure. Before brazing, the amount of large dispersed particles below 1 µm was similar in specimens annealed in both the batch-type and salt bath furnaces. These particles' states were associated with an impact that was similar to those of particle-stimulated nucleation. While brazing below 723 K, complete recrystallization was not obtained for both salt bath and batch-type annealed specimens. The salt bath annealed specimens had more amounts of Mn solid solution and showed more precipitation of fine dispersed particles while brazing up to 723 K. The recrystallized grain structure in the salt bath annealed specimens was larger than that of batch-type ones because the Mn solid solution and fine precipitates were localized on grain boundaries, thereby hindering recrystallization. After brazing, the amount of fine dispersed particles in the salt bath annealed specimens was lesser than that in the batch-type annealed specimens. This state of dispersed particles enhanced specimen strength, which is attractive for continuous cast fin stocks for heat exchangers.
    View full abstract
    Download PDF (4207K)
  • Microstructure and strength of sintered magnesium containing low-melting-point metal powders
    Taku Iwaoka, Masayuki Aonuma, Mitsuru Nakamura
    Article type: RESEARCH ARTICLE
    2015 Volume 65 Issue 7 Pages 269-274
    Published: July 30, 2015
    Released on J-STAGE: August 30, 2015
    DOIhttps://doi.org/10.2464/jilm.65.269
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Generally, magnesium powder is sintered by a large plastic deformation and surface oxide destruction is caused during the hot extrusion process. However, in this study, the binary mixtures of a low-melting-point metal powder (Sn, Bi, Sb) and the pure magnesium powder with surface oxide were sintered by transient liquid phase (TLP) under vacuum of about 3 Pa after they were degassed during heating. The size of the intermetallic compound formed at the old powder particle boundary and grain boundary influenced the strength characteristics of the sintered mixtures. As a result, the transverse rupture strength and bending strain of Mg–Sn type sintered compacts were superior to those of as-cast AZ91. This sintering technique without extrusion, the traditional liquid phase sintering, leaves room for improving strength characteristics by controlling the size of an intermetallic compound.
    View full abstract
    Download PDF (4562K)
REVIEW
LECTURE
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top