Deformation Structures of Pure Titanium during Shear Deformation
Deformation Structures of Pure Titanium during Shear Deformation
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DOI：
10.1007/s11661-009-0040-x
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发表时间：
2010-04-01
影响因子：
2.8
通讯作者：
Roven, H. J.
中科院分区：
文献类型：
--
作者：
Chen, Y. J.;Li, Y. J.;Roven, H. J.
利用电子背散射衍射（EBSD）和透射电镜（TEM）研究了工业纯钛在等通道转角挤压（ECAP）模具中3道次和4道次理论剪切区的变形组织。显微组织的典型特征是超。新晶粒与具有高密度的低角度晶界（LAGB）的粗伸长晶粒共存。位错缠结区（DTZ），位错胞（DC），亚晶粒在剪切变形过程中产生。已发现主要双晶类型为{10（1）过bar 2}。晶粒细化似乎是通过连续动态再结晶（CDRX）进行的，其中位错运动到LAGB导致其演变成高角度晶界（HAGB）。
The deformation microstructure of commercial pure (CP) titanium formed in the theoretical shear zone of an equal channel angular pressing (ECAP) die during 3 or 4 passes is investigated by electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The typical feature of the microstructure is that ultra. ne grains coexist with coarse elongated grains with a high density of low-angle grain boundaries (LAGBs). Dislocation tangle zones (DTZs), dislocation cells (DCs), and subgrains are generated during shear deformation. The primary twin type has been found to be {10 (1) over bar2}. Grain refinement appears to progress by continuous dynamic recrystallization (CDRX), in which dislocation movement to LAGBs leads to their evolution into high-angle grain boundaries (HAGBs).