晶体孪晶
材料科学
可塑性
晶界
打滑(空气动力学)
变形机理
合金
位错
钛合金
结晶学
微观结构
冶金
复合材料
热力学
化学
物理
作者
Shaolou Wei,Gaoming Zhu,Cemal Cem Taşan
出处
期刊:Acta Materialia
[Elsevier]
日期:2021-03-01
卷期号:206: 116520-116520
被引量:41
标识
DOI:10.1016/j.actamat.2020.116520
摘要
Microstructural plastic strain distribution evolution is highly heterogeneous even in single-phase alloys. One of the important factors that govern this heterogeneity is slip/twinning transfer across grain/phase boundaries. In this regard, the fundamentals of transfer across grain boundaries have drawn significant attention in the literature, while the understanding of phase boundaries remains comparatively limited. (α+β) titanium alloys provide a profound platform to explore these phenomena, since: (i) both of the present phases can exhibit plastic deformation at similar microscopic strain levels; and (ii) both dislocation slip and mechanical twinning can be triggered to accommodate plastic strain. In the present work, we evidenced a deformation transfer unit involving dislocation slip in the β-phase and {101¯2}-mechanical twin in the α-phase. We revealed by crystallographic calculations that the combination of Schmid factor and the Luster-Morris compatibility factor enables a rational quantification for the inception propensity of the slip-twinning transfer event. Our in-situ strain mapping approach verified that this sort of transfer activity can plausibly alleviate strain incompatibility/localization, demonstrating the potential to facilitate deformation homogeneity.
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