成核
材料科学
晶体孪晶
可塑性
晶体塑性
剪切(地质)
相容性(地球化学)
镁合金
微观结构
临界切应力
位错
热力学
冶金
结晶学
复合材料
物理
化学
剪切速率
粘度
作者
Chaitanya Paramatmuni,Zebang Zheng,W.M. Rainforth,Fionn P.E. Dunne
标识
DOI:10.1016/j.ijplas.2020.102778
摘要
Extension twin nucleation and variant selection in magnesium alloy WE43 is investigated in experimentally characterised and deformed microstructures replicated in crystal plasticity models. Total stored (dislocation) energy density is found to identify the experimentally observed locations of twins which are not otherwise explained by global Schmid factors or local resolved shear stress criteria. A critical total stored energy of the order 0.015 Jm-2 is determined below which twin nucleation does not occur. The total stored energy density explains the locations of the observed twins and the absence of twins in parent grains anticipated to be favourable for twin nucleation. Twin variant selection has been shown to be driven by minimising locally stored shear energy density, while the geometric compatibility and strain compatibility factors only aid in partial prediction. All experimentally observed variants were correctly determined.
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