Five-parameter intervariant boundary characterization of martensite in commercially pure titanium
Five-parameter intervariant boundary characterization of martensite in commercially pure titanium
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DOI：
10.1016/j.actamat.2018.05.023
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发表时间：
2018-08-01
期刊：
影响因子：
9.4
通讯作者：
Beladi, Hossein
中科院分区：
文献类型：
--
作者：
Farabi, Ehsan;Hodgson, Peter D.;Beladi, Hossein
根据位移相变和界面取向的晶体学描述了工业纯钛β → α马氏体相变组织的互变边界特征。马氏体相变产生了一种微观结构，其晶界取向差角分布具有四个明显的峰，这与由Burgers取向关系产生的变体之间的取向差一致。有趣的是，大约60%的种群对应于60度/[11（2）over bar 0]的变异边界。经常观察到具有三角形形态的三变体簇。这种结构与马氏体的唯象理论相一致，该理论预测这些由60度/[11（2）over bar 0]边界分开的簇具有比其他可能的变体簇排列更低的转变应变。其他的变异边界是由不同的三个变异簇的不同组合的碰撞造成的。五参数边界分析揭示了平面取向分布的强各向异性，表明当忽略取向差时，边界倾向于终止于棱柱{hki 0}和棱锥{10（1）over bar 1}平面。占主导地位的60度/[11（2）在bar 0上]互变边界具有对称倾斜（（1）在bar 101上）边界平面，这是一种低能配置。(C)2018 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The intervariant boundary characteristics of a commercially pure Ti microstructure formed by the beta ->alpha martensitic phase transformation were described according to the crystallography of the displacive transformation and the boundary plane orientation. The martensitic transformation created a microstructure whose grain boundary misorientation angle distribution had four distinct peaks that were consistent with the misorientations between the variants produced by the Burgers orientation relationship. Interestingly, about 60% of population corresponded to 60 degrees/[11 (2) over bar0] intervariant boundaries. Three-variant clusters with a triangular morphology were observed frequently. This configuration is consistent with the phenomenological theory of martensite, which predicts that these clusters, separated by 60 degrees/[11 (2) over bar0] boundaries, have a lower transformation strain than other possible variant cluster arrangements. Other intervariant boundaries resulted from the impingement of different combinations of distinct three-variant clusters. The five-parameter boundary analysis revealed a strong anisotropy in the plane orientation distribution, showing that boundaries have a tendency to terminate on prismatic {hki0} and pyramidal {10 (1) over bar1} planes, when misorientation was ignored. The dominant 60 degrees/[11 (2) over bar0] intervariant boundaries had symmetric tilt ((1) over bar 101) boundary planes, which are a low energy configuration. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.