晶体孪晶
材料科学
合金
电子背散射衍射
变形(气象学)
软化
流动应力
临界切应力
硬化(计算)
复合材料
凝聚态物理
微观结构
物理
剪切速率
粘度
图层(电子)
作者
Xiguang Deng,Deliang Zhang,Qingyang Jiao,Songxiao Hui,Wenjun Ye,Lina Zou,Zhisheng Nong
标识
DOI:10.1016/j.msea.2022.143201
摘要
The Schmid factors (SFs) of grains in a Ti–2Al (mass%) alloy deformed by quasi-static compression at room and elevated temperatures were determined by electron backscattering diffraction and presented in a SF map created based on theoretical calculation in a spherical coordinate system. These data were applied to investigate the twinning behavior in the alloy during its deformation at different temperatures. It was found that mainly {101‾2} twinning occurred in the deformed samples, and the fraction of twinned grains decreased with increasing deformation temperature. Based on the calculated SF distribution maps of twined and untwined grains in the specimens deformed at different temperatures, the critical SFs required to activate {101‾2} twinning in them were determined. From the critical SFs and associated flow stress, the corresponding critical resolved shear stress was calculated, and found to decrease linearly with the increase of deformation temperature from 140 MPa at room temperature to 50 MPa at 800 °C. The macroscopic thermal softening coefficient, m, of the Ti–2Al alloy was also studied, and it was found that the 2mass%Al addition to Ti did not cause any significant change. On the other hand, the strain hardening behavior of the alloy was dictated by the amount of twinning during the deformation process.
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