爆炸冲击加载-Fe中{332}孪晶形成规律的研究
肖 博，隋曼龄*爆炸冲击加载a-Fe中{332}孪晶形成规律的研究
肖 博，隋曼龄*
（北京工业大学固体微结构与性能研究所，北京 100124)
摘 要：｛332｝孪晶作为体心立方晶体的一种反常孪晶，其研究多在亚稳β-Ti合金中进行，而对于a-Fe中的｛332｝孪晶研究较少。由于在a-Fe中｛332｝孪晶仅出现在经历了高压冲击加载的样品中，以往的研究主要探讨｛332｝孪晶能否作为发生α→ε→α可逆相变的标志，但对冲击加载Fe中｛332｝孪晶的形成条件和形成机制等问题尚不清晰。本文在对多晶铁样品的精细微观结构研究中，重点研究了a-Fe在冲击加载下形成｛332｝孪晶的压力位置、晶粒取向、形成条件和形成机制，首次在点阵调整的背景下计算了各孪生体系的施密特因子，揭示了｛332｝孪晶与α→ε相变的关联本质
关键词：冲击加载；体心立方；纯铁（a-Fe）；｛332｝孪晶
中图分类号：O614.81+1；O762；TG1115.21+5.3 文献标识码：A doi:10.3969/j.issn.1000-6281.2015.05.008
Study on the formation of {332} twins in explosive shock-loaded a-Fe
XIAO Bo，SUI Man-ling*
（Institute of Microstructure and Properties of Advanced Materials, Beijing University ofTechnology, Beijing, 100124, China）
Abstract：{332} twin, a kind of abnormal twins in body-centered cubic (bcc) structure, has been investigated widely in metastable β-Ti alloys but seldom in a-Fe systems. As the {332} twins in a-Fe only exist in the samples experienced the high pressure shock loading, it has been the important argument whether the {332} twin can be a symbol for the occurrence of the reversible α→ε→α phase transition or not. However, the occurrence condition and the formation mechanism of {332} twins are still not clear. In this study, the loading direction and the matrix orientation for the occurrence of {332}<113> twins were focused, and the formation mechanism of the {332} twins was revealed by considering the lattice compression. The Schmid factors of each twinning systems were calculated based on the adjustment of the lattice parameter. The {332} twinning was preferred in the compressed lattice of a-Fe. The relationship between {332} twins and α→ε phase transition was discussed.
Keywords：shock loading; bcc structure; a-Fe; {332} twinning
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