日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 84, No. 03 (2020),
pp. 109-114

Influences of Carbon Addition on Mechanical Properties and Hydrogen Evolution of Thixomolded AM60B and AZ91D Magnesium Alloys

Yoshiaki Hashimoto1, Makoto Hino2, Takehiko Yanagiya3, Takeshi Yamaguchi3, Yutaka Mitooka4 and Teruto Kanadani5

1STU Co., Ltd. (Present: STU R&D Center, JAPAN MATERIAL Co., Ltd.), Soja 719-1102
2Department of Mechanical Systems Engineering, Faculty of Engineering, Hiroshima Institute of Technology, Hiroshima 731-5193
3The Japan Steel Works, Ltd., Hiroshima 736-8602
4Industrial Technology Center of Okayama Prefecture, Okayama 701-1296
5Okayama University of Science, Okayama 700-0005

Abstract:

In this study, the effects of carbon nanoparticles fixed to the surfaces of AM60B and AZ91D magnesium alloy chips on the mechanical properties were examined. The manufacture of magnesium-carbon alloy is not easy because carbon does not possess the property of wettability for magnesium. However, magnesium alloy chips fixed to carbon nanoparticles enable magnesium-carbon alloys to be produced by the thixomolding process. Mechanical properties such as the tensile and fatigue strengths were improved by only 0.1 mass% of the carbon addition because of the decrease in the void and the refinement of crystal grains. In addition, the AZ91D magnesium alloy was proven to be more effective than the AM60B magnesium alloy for the decrease in the void and the refinement of crystal grains by the carbon addition. The aluminum content of the AZ91D magnesium alloy is higher than that of the AM60B alloy. It seems that the void formation is based on the hydrogen by the reaction between aluminum in the magnesium alloy and water. Therefore, the effect of carbon addition on the mechanical properties was dependent on the aluminum content in the magnesium alloys.

[doi:10.2320/jinstmet.JB201905]


(Received 2019/08/19)

Keywords:

AM60B magnesium alloy, AZ91D magnesium alloy, carbon addition, thixomold forming, mechanical property


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