Two-step temperature dependence of the yield stress in crystals
Two-step temperature dependence of the yield stress in crystals
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晶体屈服应力的两步温度依赖性
DOI：
10.1016/j.jallcom.2003.10.069
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发表时间：
2004
影响因子：
6.2
通讯作者：
S. Takeuchi
中科院分区：
文献类型：
--
作者：
S. Takeuchi
单晶临界分解剪应力（CRSS）的温度依赖性通常表现为两步变化。在位错滑动的Peierls机制的基础上，理论上可以预期：(1)降顶或平顶Peierls势，(2)窄解位错的Peierls机制和(3)具有不同Peierls应力和不同扭结能的两种稳定的核心构型发生两步变化。本文在讨论了bcc金属和四面体配位晶体的CRSS与T的关系后，详细讨论了Kirichenko [Phys]报道的四角形β-Sn中（100）[010]和（100）[001]滑移的两步CRSS与T曲线。满足。金属学报，63(1)(1987)144]，并报道了具有硬取向的NiAl单晶。
The temperature dependence of the critical resolved shear stress (CRSS) of single crystals often exhibits a two-step change. On the basis of the Peierls mechanism of the dislocation glide, a two-step change can theoretically be expected for (1) a depressed-top or a flat-top Peierls potential, (2) the Peierls mechanism of a narrowly dissociated dislocation and (3) two stable core configurations with different Peierls stresses and different kink energies. In this paper, after discussing the CRSS versus T relations for bcc metals and tetrahedrally coordinated crystals, detailed discussion has been made on the two-step CRSS versus T curves reported for (100)[010] and (100)[001] slips in tetragonal β-Sn reported by Kirichenko [Phys. Met. Metallogr. 63 (1) (1987) 144] and on that reported for single crystals of NiAl with the hard orientation.