AZ31镁合金在平面应变压缩过程中的孪生行为研究

发布时间：2018-06-08 21:23

本文选题：AZ镁合金 + 平面应变　；参考：《金属学报》2015年12期

【摘要】：采用EBSD技术研究了AZ31镁合金在平面应变压缩过程中的孪生行为.结果表明,当压缩方向为TD,约束方向为RD时,孪生类型主要以{1012}拉伸孪晶为主,孪生变体的选择主要由沿TD的孪生Schmid因子(m)决定,并受RD的影响.可用孪生应变张量来解释不同类型孪生晶粒的差异.对于晶粒内部只发生1个{1012}孪生变体的情况,孪生变体在约束方向上的平均孪生应变张量会使得样品伸长;对于晶粒内部含有2个及以上变体的情况,孪生m较大的变体在约束方向上的平均孪生应变张量使得样品伸长,而m较小的变体使得样品在约束方向缩短,在平面应变压缩变形过程中,不同类型的孪生变体相互协调变形.
[Abstract]:The twinning behavior of AZ31 magnesium alloy during plane strain compression was studied by EBSD technique. The results show that when the compression direction is TD and the constraint direction is Rd, the type of twinning is mainly {1012} tensile twins, and the choice of twinning variants is mainly determined by the twinning Schmid factor (m) along TD, which is influenced by Rd. The twinning strain Zhang Liang can be used to explain the difference of different types of twinning grains. In the case of only one {1012} twin variant occurring in the grain interior, the average twinning strain Zhang Liang of the twin variant in the bound direction will result in the elongation of the sample, and for the case where there are two or more variants in the grain, The average twinning strain (Zhang Liang) of the larger twinning strain in the constraint direction makes the sample elongate, while the smaller variation m makes the sample shorten in the confined direction, and in the process of plane strain compression, Different types of twin variants coordinate with each other.
【作者单位】：福州大学材料科学与工程学院;重庆大学材料科学与工程学院;西南大学材料与能源学部材料工程系;
【基金】：国家自然科学基金资助项目51301040~~
【分类号】：TG146.22

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