Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 63, Issue 9
Displaying 1-4 of 4 articles from this issue
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RESEARCH ARTICLE
  • Effect of tool insert speed and preheating time on mechanical properties of friction stir welded 5052 aluminum alloy joint
    Hideki Furuichi, Jyunichi Arafuka, Kazuyoshi Katoh
    Article type: RESEARCH ARTICLE
    2013 Volume 63 Issue 9 Pages 303-309
    Published: September 30, 2013
    Released on J-STAGE: October 30, 2013
    DOIhttps://doi.org/10.2464/jilm.63.303
    JOURNAL FREE ACCESS
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    5052-H34 aluminum alloy plate with 5 mm in thickness was friction stir welded using a numerically controlled friction stir welder. The effects of tool insert speed and preheating time on the microstructures and mechanical properties of friction stir welded joint were investigated. Regardless of welding conditions, the microstructures of stir zone showed finer than that of the base metal. In case of tool insert speed 90 mm/s and preheating time 0.1 s, the kissing bond was observed in the bottom of weld interface of joint. However, preheating time more than 5 s, kissing bond was not observed in bottom of weld interface of joint. The hardness of heat affected zone was softer than that of the base metal. The heat affected zone became narrow in conditions of tool insert speed 90 mm/s and preheating time 0.1 s. Maximum tensile strength of start position of joint was 205 MPa, and it was 83% of base metal. The conditions were tool insert speed 90 mm/s and preheating time 5 s.
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  • Development of elasto-viscoplastic constitutive equation for Al–Mg alloy with tensile test in partial solidification
    Ryosuke Takai, Akira Matsushita, Shogo Yanagida, Koichiro Nakamur, Mak ...
    Article type: RESEARCH ARTICLE
    2013 Volume 63 Issue 9 Pages 310-317
    Published: September 30, 2013
    Released on J-STAGE: October 30, 2013
    DOIhttps://doi.org/10.2464/jilm.63.310
    JOURNAL FREE ACCESS
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    In order to predict the hot tearing during DC casting by using thermal stress analysis, constitutive equations in both solid–liquid coexisting and below solidus of alloy are inevitable. However, previous constitutive equations used in hot tearing predictions have no less than one problem as follows. (1) Testing methods of obtaining material constants weren't appropriate. Firstly, elastic strain reversibility was unconfirmed. Secondary, flat distribution of temperature in gauge length of specimen wasn't guaranteed. Thirdly, strain was measured from not local strain but cross head displacement. Fourth, the melt-back phenomenon was unavoidable in partial melting method which was caused by homogenization of segregation structure. (2) Temperature dependence of strain rate sensitivity of stress wasn't considered. (3) Some material constants were not obtained experimentally but guessed. In this study, elasto-viscoplastic constitutive equations (Hooke's and Norton's laws) for both partial solidification and below solidus were developed. In order to obtain material constants experimentally, two tensile tests which the problem (1) was solved were conducted using Al–5mass%Mg alloy. They were partial solidification tensile tests (above solidus) and high temperature tensile test with high frequency induction (below solidus). Then, temperature dependence of elastic, viscoplastic properties were investigated and material constants were obtained. Furthermore, they were compared with other previous testing methods.
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