COMPETITION AMONG BASAL, PRISM, AND PYRAMIDAL SLIP MODES IN HCP METALS
COMPETITION AMONG BASAL, PRISM, AND PYRAMIDAL SLIP MODES IN HCP METALS
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DOI：
10.1007/bf02811542
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发表时间：
1970-01-01
期刊：
影响因子：
--
通讯作者：
MAMMEL, WL
中科院分区：
文献类型：
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作者：
CHIN, GY;MAMMEL, WL
已经根据临界解析剪切应力 CRSS 准则对 hcp 金属之间的滑移竞争和滑移模式进行了几何分析。在所施加的应力的作用下，根据CRSS的值以及滑移系统相对于所施加的应力的方向，可以激活一种或多种模式的滑移系统。然而，如果给定滑动模式的CRSS超过相对于其他模式的CRSS的极限值，则即使在最有利的应力条件下，给定模式也变得不起作用。通过屈服位点检验发现，如果α2< cos θ，则基底滑移不起作用；如果 α2< α1sin θ，则棱镜滑移不起作用；如果 α2> cos θ + α1sin θ，则金字塔滑移不起作用，其中分别是棱镜和金字塔滑移的 CRSS 相对于基底滑移的比率，而 是 (0001) 和法线之间的角度。由于 Φ 的值是 c/a 的函数，因此 α1 和 α1 的极限值取决于晶体结构的 c/a 比率。
The competition of slip among, andslip modes of hcp metals has been analyzed geometrically in terms of a critical resolved shear stress, CRSS, criterion. Under the action of an applied stress slip systems of one or more modes may be activated depending on the value of the CRSS and on the orientation of the slip systems with respect to the applied stress. If the CRSS of a given slip mode should exceed a limiting value relative to the CRSS of the other modes, however, the given mode becomes inoperative even under the most favorably stressed conditions. It is found by an examination of the yield loci that basal slip is inoperative if α2< cos θ; prism slip is inoperative if α2< α1sin θ; and pyramidal slip is inoperative if α2> cos θ + α1sin θ whereandare, respectively, the ratios of CRSS for prism and pyramidal slips relative to basal slip, and ϕ is the angle between the (0001) andnormals. Since the value of ϕ is a function ofc/a, the limiting values of α1and α1depend on thec/aratio of the crystal structure.