Nucleation and growth of twins in Zr: A statistical study
Nucleation and growth of twins in Zr: A statistical study
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DOI：
10.1016/j.actamat.2009.08.030
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发表时间：
2009-12-01
期刊：
影响因子：
9.4
通讯作者：
Tome, C. N.
中科院分区：
文献类型：
--
作者：
Capolungo, L.;Marshall, P. E.;Tome, C. N.
利用电子背散射衍射（EBSD）进行了深入的统计分析，揭示了在77 K下应变至5%和10%的高纯多晶锆中（10 (1)over bar2）孪晶与晶粒尺寸、晶体取向、晶界长度和邻居错取向之间的统计相关性。发现活性孪晶变体与晶体取向有很强的相关性。晶粒的孪晶倾向对晶粒面积和晶粒直径的依赖性较弱。在含孪晶的晶粒群体中，每个晶粒的孪晶数随晶粒面积的增加而显著增加，孪晶厚度对晶粒尺寸和取向不敏感。较小的晶界取向角对孪晶有微弱的偏好。这些和其他统计结果的报道可以改进理论处理孪核在多晶模型。所提出的统计方法一般适用于各种金属的所有孪生类型。(C) 2009材料学报Elsevier Ltd.出版。版权所有。
An in-depth statistical analysis using electron backscatter diffraction (EBSD) is carried out to expose statistical correlations between (10 (1) over bar2) twinning and grain size, crystallographic orientation, grain boundary length, and neighbor misorientation in high-purity polycrystalline zirconium strained to 5% and 10% at 77 K. A strong correlation was found between the active twin variant and crystallographic orientation. The propensity of it grain to twin or not was found to be only weakly dependent on grain area and diameter. Within the population of grains containing twins the number of twins per grain noticeably increases with grain area, and twin thickness is found to be rather insensitive to grain size and orientation. A weak preference for twinning was found for smaller grain boundary misorientation angles. These and the other statistical results reported can improve theoretical treatments for twin nucleation in polycrystal models. The statistical methodology presented has general applicability for all twin types in a wide range of metals. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.