Influence of initial texture on formability of AZ31B magnesium alloy sheets at different temperatures |
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Authors: | Hua Zhang Guangsheng Huang Deqiang Kong Gaofeng Sang Bo Song |
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Affiliation: | a College of Material Science and Engineering, Chongqing University, Chongqing 400045, China b National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China |
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Abstract: | Repeated unidirectional bending (RUB) process was carried out to improve the texture of AZ31B magnesium alloy sheets. Influence of initial texture on formability of AZ31B magnesium alloy sheets at different temperatures was investigated. Compared with the as-received sheets, the limiting drawing ratio of the RUB processed sheets increased to 1.3 at room temperature, 1.5 at 50 °C and 1.7 at 100 °C, respectively. The improvement of the press formability at lower temperatures can be attributed to the texture modification, which led to a smaller Lankford value and a larger strain hardening exponent. However, the press formability of the sheet with a weakened basal texture has no advantage at higher temperature. This is due to much smaller r-value that results in severe thinning in thickness direction during the stamping process which is unfavorable to forming. Anyhow it is likely that the texture control has more effect on the press formability at lower temperature. |
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Keywords: | Magnesium alloy sheet RUB Texture Formability |
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