日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 82, No. 07 (2018),
pp. 249-255

Effects of Calcium Concentration on Room Temperature Formability and Damping Properties of Rolled Mg-Ca Alloys

Tomoyuki Noguchi 1, Kazutaka Suzuki 2, Xinsheng Huang 2, Naobumi Saito 2, Yuhki Tsukada 1, Toshiyuki Koyama 1 and Yasumasa Chino 2

1 Department of Materials Design Innovation Engineering, Graduate School of Engineering, Nagoya University
2 Structural Materials Research Institute, National Institute of Advanced Industrial Science and Technology

Abstract:

In this study, rolled Mg-Ca alloys were processed by high-temperature pre-annealing at 500℃ and subsequent warm rolling at 200℃. The rolled alloys processed by repetition of the above rolling procedure were finally annealed at 350℃. This process was effective rolling procedure for suppression of basal texture formation of Mg-Mn and Mg-Ce alloys. The rolled Mg-0.1Ca alloy exhibited a significantly increased Erichsen value of 7.1, which was much larger value compared with commercial Mg alloys. On the other hand, excessive calcium addition more than 0.3 mass% deteriorated room temperature formability. Basal texture intensity of Mg-Ca alloys had much smaller value, when calcium concentration was set more than 0.1 mass%, indicating that the suppression of basal texture formation mainly contributed to the enhanced stretch formability of Mg-0.1Ca alloy. The deteriorated formability of Mg-0.3Ca alloy was attributed to the formation of coarse precipitates in the alloy. Retardation of dynamic recrystallization during warm rolling was suggested to be one of the reason for suppression of strong basal texture formation for Mg-Ca alloy, when calcium concentration was set to more than 0.1 mass%. The internal friction of the Mg-0.1Ca alloy was found to be almost the same as that of pure magnesium at certain strain amplitude.

[doi:10.2320/jinstmet.J2018007]


(Received 2018/01/30)

Keywords:

magnesium alloys, texture, stretch formability, mechanical properties, basal texture, damping


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