Nonbasal deformation modes of HCP metals and alloys: Role of dislocation source and mobility
Nonbasal deformation modes of HCP metals and alloys: Role of dislocation source and mobility
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DOI：
10.1007/s11661-002-0150-1
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
M. Yoo;J. R. Morris;K. Ho;S. Agnew
中科院分区：
文献类型：
--
作者：
M. Yoo;J. R. Morris;K. Ho;S. Agnew
本文综述了位错核和平面断层在hcp金属和合金以及D 019金属间化合物中激活<c+a>锥体滑移和形变孪晶等非基底变形模式中的作用。材料特定的机械行为产生于交替缺陷结构之间的竞争，决定了变形模式。我们强调这些缺陷的精确原子建模的重要性，超越简单的原子间能量模型。通过讨论Ti和Mg单晶; Ti-，Zr-和Mg-基合金;和Ti 3Al有序合金的具体实例，总结了最近的实验和理论结果。还讨论了剩余的关键问题和未来的研究方向。
A review is presented on the role of dislocation cores and planar faults in activating the nonbasal deformation modes, <c+a> pyramidal slip and deformation twinning, in hcp metals and alloys and in D019intermetallic compounds. Material-specific mechanical behavior arises from a competition between altemate defect structures that determine the deformation modes. We emphasize the importance of accurate atomistic modeling of these defects, going beyond simple interatomic energy models. Recent results from both experiments and theory are summarized by discussing specific examples of Ti and Mg single crystals; Ti-, Zr-, and Mg-base alloys; and Ti3Al ordered alloys. Remaining key issues and directions for future research are also discussed.