Slip transfer across phase boundaries in dual phase titanium alloys and the effect on strain rate sensitivity

被引：118

作者：

Zheng, Zebang ^{[1
]}

Waheed, Sana ^{[2
]}

Balint, Daniel S. ^{[2
]}

Dunne, Fionn P. E. ^{[1
,2
]}

机构：

[1] Imperial Coll London, Dept Mat, London SW7 2AZ, England

[2] Imperial Coll London, Dept Mech Engn, London SW7 2AZ, England

来源：

INTERNATIONAL JOURNAL OF PLASTICITY | 2018年 / 104卷

基金：

英国工程与自然科学研究理事会;

关键词：

Dislocation transmission; Strain rate sensitivity; Dual phase titanium; Discrete dislocation plasticity; Crystal plasticity; DISCRETE DISLOCATION PLASTICITY; ROOM-TEMPERATURE DEFORMATION; GRAIN-BOUNDARIES; CRYSTAL PLASTICITY; DWELL FATIGUE; TRANSMISSION; MECHANISMS; INTERFACES;

D O I：

10.1016/j.ijplas.2018.01.011

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Dislocation transmission through alpha/beta phase boundaries in titanium alloys is studied using integrated crystal plasticity (CP) and discrete dislocation plasticity (DDP) modelling techniques, combined with experimental micro-pillar compression test results. Direct dislocation transmission together with the nucleation of new dislocations ahead of a pile-up at an alpha/beta interface, termed indirect slip transfer, are both assessed and their role in controlling microstructure-dependent strain rate sensitivity considered. A critical shear stress criterion for direct slip transfer across an alpha/beta interface in Ti-6242 has been established by capturing the local slip penetration through the phase boundary using CP and DDP comparisons with experimental two phase micro-pillar compression. The competition between direct and indirect slip transfer has been investigated using a single Frank-Read source DDP model. Direct slip transfer is found to occur only under specific conditions which have been quantified. The strain rate sensitivity of dual phase titanium alloys is demonstrated to depend on average pile-up size which is significantly influenced by alpha/beta morphology.

引用

页码：23 / 38

页数：16

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