| 间断变形工艺提高AZ31镁合金超塑性的研究 |
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| 引用本文： | 张诗昌,陶志强,胡衍生,朱明.间断变形工艺提高AZ31镁合金超塑性的研究[J].武汉冶金科技大学学报,2009(2):123-126. |
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| 作者姓名： | 张诗昌 陶志强 胡衍生 朱明 |
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| 作者单位： | 武汉科技大学钢铁冶金与资源利用省部共建教育部重点实验室,湖北武汉430081 |
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| 基金项目： | 湖北省教育厅重点资助项目（Z200511007）. |
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| 摘 要： | 研究间断变形工艺对AZ31镁合金超塑性的影响。结果表明，当温度为400-440℃、应变速率小于5×10^-4s^-1时，间断变形工艺可以显著提高AZ31镁合金的超塑性。计算了空洞体积分数与空洞数量的关系。结果表明，空洞体积分数与空洞数量呈正比。对拉伸试样断口形貌的分析表明，间断变形减少了空洞数量，因而减小了空洞体积分数，提高了超塑性伸长率。
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| 关 键 词： | 间断变形 超塑性 空洞 AZ31镁合金 |
Raising the superplasticity of AZ31 magnesium alloy via discontinuous deformation process |
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| Authors: | Zhang Shichang Tao Zhiqiang Hu Yansheng Zhu Ming |
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| Affiliation: | (Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China) |
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| Abstract: | The effect of discontinuous deformation process （DDP） on the superplasticity of AZ31 magnesium alloy was investigated. The results show that the superplasticity is significantly improved under DDP at temperatures ranging from 400 to 440 ℃ and strain rate less than 5×10^-4s^-1. An equation is built to calculate the volume friction of cavities, and it appears that the volume friction is proportional to the numbers of cavities. The ruptured morphology of the tensile specimens is analyzed showing that DDP reduces the numbers of cavities so that it reduces the volume friction of cavities and improves superplastic elongation of AZ31 magnesium alloy. |
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| Keywords: | DDP superplasticity cavity AZ31 magnesium alloy |
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