Initiation and accommodation of primary twins in high-purity titanium

晶体孪晶 电子背散射衍射 材料科学 再结晶(地质) 衍射 动态再结晶 结晶学 凝聚态物理 微观结构 冶金 光学 热加工 地质学 古生物学 化学 物理
作者
Hong Qin,John J. Jonas,Hongbing Yu,Nicolas Brodusch,Raynald Gauvin,Xiyan Zhang
出处
期刊:Acta Materialia [Elsevier BV]
卷期号:71: 293-305 被引量:108
标识
DOI:10.1016/j.actamat.2014.03.025
摘要

Uniaxial compression tests were carried out at room temperature and at strain rates of 0.001, 0.01, 0.1 and 1 s−1 on samples of high-purity titanium. The initial texture was favorably oriented for contraction twinning. The double-differentiation method was employed to detect the initiation of twinning as well as of dynamic recrystallization. Critical strains of about −0.24 and −0.65 were determined, respectively, for these two mechanisms. The relevant mechanisms were identified by means of electron backscatter diffraction (EBSD) techniques. At a true strain of ε = −0.3, two main kinds of primary twins, {112¯2} contraction and {101¯2} extension, were observed and second-generation twins were also identified by means of the EBSD analysis. The presence of low Schmid factor (SF) (<0.2) twins was established as well as the absence of potential high SF (>0.4) twins. The appearance of the low SF twins is explained in terms of the low accommodation work required in the neighboring grains; this involves prismatic glide in the present case. The absence of the potential high SF twins, on the other hand, is justified as requiring the operation of a combination of several difficult deformation modes: basal glide, pyramidal glide, and twinning.
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