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Structural characterization of the 112¯2 twin boundary and the corresponding stress accommodation mechanisms in pure titanium
Journal of Materials Science & Technology ( IF 10.9 ) Pub Date : 2020-09-17 , DOI: 10.1016/j.jmst.2020.07.030
Bingqiang Wei , Song Ni , Yong Liu , Min Song

{112-2} compression twin plays an important role in accommodating deformation along the c axis of HCP metals. However, the studies on the interface structure of {112-2} twin boundary (TB), especially the twin tip, and the corresponding local stress release mechanism are still limited. This work studied the interface characters of {11 2- 2} TB of a deformed pure titanium by transmission electron microscope. The {11 2- 2} TB presented serrated character, consisting of coherent twin boundary (CTB) and (0002)T // (112-2-)M or (112-2-)T // (0002)M steps, and the twin tip was fully composed of the basal-pyramidal (BPy) and pyramidal-basal (PyB) steps. The twin tip presents asymmetric morphology and the step height at the twin tip is much larger than that away from the twin tip. Two types of local stress accommodation mechanisms were observed: zonal dislocation emission and hexagonal close packed structure to face-centered cubic structure transformation. The zonal dislocation was produced by the dissociation of the 1/3 < 11 2-3- > <c + a > dislocation that was nucleated at the twin tip and the phase transformation was introduced by emission of Shockley partial dislocations from the {11 2- 2} twin boundary.



中文翻译:

的结构表征 112¯2 纯钛的孪生边界和相应的应力适应机制

{112--2}压缩孪晶在适应HCP金属沿c轴的变形中起着重要作用。但是,关于{112--2}双边界(TB),尤其是双尖端,以及相应的局部应力释放机制仍然受到限制。这项工作研究了{112--通过透射电子显微镜观察到的2} TB变形的纯钛。{112--2}结核呈锯齿状,由相干双边界(CTB)和(0002)T //(112--2--M或(112--2--T //(0002)M步,并且双尖端完全由基底锥体(BPy)和锥体基底(PyB)步组成。双尖端呈现出不对称的形态,并且双尖端处的台阶高度远大于远离双尖端的台阶高度。观察到两种类型的局部应力调节机制:区域位错发射和六边形密堆积结构向面心立方结构的转变。区域性位错是由1/3 <11的解离产生的2--3-- > <c + a>位错在双尖端处成核,并且相变是通过从{11 2-- 2}双边界。

更新日期:2020-09-18
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