Grian growth in a nanostructured AZ31 Mg alloy containing second phase particles studied by phase field simulations
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- 作者：Yan Wu 吴艳 ; Yaping Zong 宗亚平 ; Jianfeng Jin 金剑锋
- 刊名：Science China Materials
- 出版年：2016
- 出版时间：May 2016
- 年：2016
- 卷：59
- 期：5
- 页码：355-362
- 全文大小：1,498 KB
- 刊物类别：Materials Science, general; Chemistry/Food Science, general;
- 刊物主题：Materials Science, general; Chemistry/Food Science, general;
- 出版者：Science China Press
- ISSN：2199-4501
- 卷排序：59
文摘
Phase field models were established to simulate the grain growth of a nanostructured AZ31 magnesium alloy, which contain spherical particles of differing sizes and volume fractions, under realistic spatial and temporal scales. The effect of the second phase particles on the nanostructure evolution was studied. The simulated results were compared with those of the conventional microstructured alloy. The expression of the local free energy density was improved by adding a second phase particle term. The right input parameters were selected for proper physical meaning. It was shown that the rules that govern the pinning effect of the second phase particles during the grain growth were different for the nanostructure and microstructure. There was a critical particle size value that affected the grain growth within the nanostructure. If the particle size was lower than the critical value, the pinning effect on grain growth increased with decreasing particle size. When the particle size was greater than the critical value, the particles had almost no pinning effect. However, in the conventional microstructured material, the larger particle size resulted in an enhanced pinning effect during grain growth for particle sizes smaller than 1 μm. The effect was reversed when the particle size was larger than the critical value. For the nanostructure, the critical value was 200 nm when the particle content was 10 v.%, and the critical value decreased when the content increased. When the particle size was 30 nm, the particle pinning effect on the grain growth increased for increasing particle content.Keywordsphase field modelssecond phase particlesgrain growthmagnesium alloy