High-pressure torsion applied to nickel single crystals
High-pressure torsion applied to nickel single crystals
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DOI：
10.1080/14786430802337071
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发表时间：
2008-01-01
影响因子：
1.6
通讯作者：
Pippan, Reinhard
中科院分区：
文献类型：
--
作者：
Hafok, Martin;Pippan, Reinhard
对不同晶向的镍单晶进行了高压扭转变形。特别注意的是专门研究的微观织构和微观结构的演变。初始晶体取向被发现有一个显着的影响，在低和中等当量应变的机械硬化和微观织构的演变，而在非常高的应变没有效果的初始取向观察和行为是非常相似的多晶。微观织构的演化与完全约束Taylor模型定性一致。在很高的等效应变下，初始晶体取向对显微织构没有影响。在这样的应变下，硬化、组织和织构的细化达到饱和。最后的微观织构解释的变化，从一个优选的晶体取向到另一个。
Nickel single crystals with different crystallographic orientations were deformed by high-pressure torsion. Special attention is devoted to examining the evolution of the micro-texture and microstructure. The initial crystal orientation was found to have a significant effect on the mechanical hardening and evolution of micro-texture at low and medium equivalent strains, whereas at very high strains no effect of the initial orientation was observed and the behaviour was very similar to a polycrystal. The evolution of micro-texture is in good qualitative agreement with the full constrained Taylor model. At very high equivalent strains the initial crystal orientation has no influence on micro-texture. At such strains, the hardening, the refinement of the structure and the texture reaches a saturation. The final micro-texture is explained by the change from one preferred crystallographic orientation to another.