Microstructure development during equal-channel angular pressing of titanium
Microstructure development during equal-channel angular pressing of titanium
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DOI：
10.1016/s1359-6454(02)00501-3
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发表时间：
2003-02-25
期刊：
影响因子：
9.4
通讯作者：
Semiatin, SL
中科院分区：
文献类型：
--
作者：
Shin, DH;Kim, I;Semiatin, SL
研究了工业纯钛等通道转角挤压（ECAP）过程中微观组织的演变，以建立晶粒细化和应变调节机制。通过三种不同的加工路线：A、B和C，在623 K下使样品变形。在第一道次之后，透射电子显微镜（TEM）显示由压制施加的应变主要由{10（1）过棒1}变形孪晶来调节。在第二道次变形过程中，变形机制转变为位错滑移，其机制依赖于特定的路径。对于C路线，在交替的孪晶带内发生棱柱（a）和棱锥（c + a）滑移。对于路线B，棱柱体滑移是主要的变形机制.对于路径A，变形由基底滑移和交替孪晶带中的微孪晶控制。变形行为的变化被解释在第一道次期间形成的织构和在随后的变形期间的滑移的Schmid因子。(C)2002 Acta Materialia Inc.由爱思唯尔科技有限公司出版。保留所有权利。
The development of microstructure during equal-channel angular pressing (ECAP) of commercial-purity titanium was investigated to establish the mechanisms of grain refinement and strain accommodation. Samples were deformed at 623 K via three different processing routes: A, B, and C. After the first pass, transmission electron microscopy (TEM) revealed that the strain imposed by pressing was accommodated mainly by {10 (1) over bar1} deformation twinning. During the second pass, the deformation mechanism changed to dislocation slip on a system which depended on the specific route. For route C, prism (a) and pyramidal (c + a) slip occurred within alternating twin bands. For route B, prism a slip was the main deformation mechanism. For route A, deformation was controlled by basal a slip and micro-twinning in alternating twin bands. The variation in deformation behavior was interpreted in terms of the texture formed during the first pass and the Schmid factors for slip during subsequent deformation. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.