Influence of initial texture on formability of AZ31B magnesium alloy sheets at different temperatures
Influence of initial texture on formability of AZ31B magnesium alloy sheets at different temperatures
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DOI：
10.1016/j.jmatprotec.2011.04.009
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发表时间：
2011-10
影响因子：
6.3
通讯作者：
Hua Zhang;Guangsheng Huang;D. Kong;Gao Sang;B. Song
中科院分区：
文献类型：
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作者：
Hua Zhang;Guangsheng Huang;D. Kong;Gao Sang;B. Song
为改善AZ31B镁合金板材的织构，采用重复单向弯曲工艺。研究了不同温度下初始织构对AZ31B镁合金板材成形性能的影响。与未经摩擦处理的板材相比，摩擦处理后的板材的极限拉伸倍数在室温、50℃和100℃时分别提高到1.3、1.5和1.7。在较低温度下冲压成形性能的改善可以归因于织构的改变，这导致了较小的朗克福德值和较大的应变硬化指数。然而，基面织构减弱的板材在较高温度下的冲压成形性没有优势。这是由于较小的误差值导致在冲压过程中厚度方向严重变薄，这不利于成形。无论如何，在较低的温度下，织构控制对冲压成形性能的影响可能更大。
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 smallerr-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.