Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 69, Issue 7
Displaying 1-4 of 4 articles from this issue
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RESEARCH ARTICLE
  • Effect of extrusion conditions on recrystallization texture in A6063 alloy
    Masahiro Araki, Kenji Matsuda, Seungwon Lee, Taiki Tsuchiya, Susumu Ik ...
    2019 Volume 69 Issue 7 Pages 327-331
    Published: July 30, 2019
    Released on J-STAGE: August 30, 2019
    DOIhttps://doi.org/10.2464/jilm.69.327
    JOURNAL FREE ACCESS
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    The effect of extrusion conditions on recrystallization texture and preferential orientation formation of A6063 aluminum alloy extruded material was evaluated by electron back scattered diffraction (EBSD) technique and the extrusion simulation. Samples were prepared by different extrusion conditions as follows; extrusion temperature at 773 and at 813 K, the extrusion ram speed to 3 and 10 mm/s, and the extrusion ratio for 28.9, 34.7 and 66.6. The recrystallized texture of the extruded material was mainly composed of Cube orientation and Goss orientation in which 〈100〉 was oriented parallel to the extrusion direction. The Brass, S, {112} 〈110〉 orientation in which the 〈111〉 orientation was oriented in the extrusion transverse line direction was the preferential orientation on the surface. The distribution of texture corresponded to the distribution state of extrusion shear stress found by simulation. The magnitude of the shear stress also changed by changing the extrusion conditions, and the presence ratio of the Brass, S, {112} 〈110〉 orientation of the surface was changed, but the major orientation did not change.

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  • Influence of grain size on tensile properties of magnesium alloys
    Yuya Sakaoka, Shigeru Kuramoto, Hiroyuki Kawabata, Akira Kurumada
    2019 Volume 69 Issue 7 Pages 332-338
    Published: July 30, 2019
    Released on J-STAGE: August 30, 2019
    DOIhttps://doi.org/10.2464/jilm.69.332
    JOURNAL FREE ACCESS
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    Magnesium has the lowest density among the engineering metallic materials and significant weight reduction can be achieved if magnesium alloys are used in automobiles, trains, airplanes, etc. However, they have some practical limitations in mechanical properties and corrosion resistance compared with other metallic materials. Generally, grain refinement is an effective way for enhancing the strength of metallic materials, and it has been reported that the grain refinement is very effective to strengthen the magnesium alloys. In this study, the influence of grain size on the tensile properties of three magnesium alloys has been investigated using specimens having grain sizes ranging from 100 nm to 100 µm. The grain size was changed by heat treatment after HPT processing, and the tensile tests have been made at an initial strain rate of 1.0×10−4 s−1. The grain refinement is effective for strengthening in the coarse-grained samples in which grain size is larger than 3 µm, but its effect decreases significantly in the fine-grained samples in which grain size is below 3 µm. This difference in effect of grain refinement has been discussed in relation to deformation mechanism.

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