Tension-compression asymmetry of ⟨c plus a⟩ slip in Ti-6Al

SCRIPTA MATERIALIA

卷:178

Article

Roberts, William²  Gong, Jicheng²  Wilkinson, Angus J.²  Tarleton, Edmund^1,2 

[1] Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX1 3PJ, England

[2] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England

关键词: < c plus a > slip;    Ti-6Al;    Tension compression asymmetry;    Crystal plasticity;    CRSS;   

DOI  :  10.1016/j.scriptamat.2019.11.002

来源: Elsevier

【 摘 要 】

Microcantilevers with triangular cross-sections were machined using a focused ion beam from an a Ti-6Al alloy. Plasticity was predominantly in the lower part of the cantilever, allowing tension-compression asymmetry to be investigated by bending the cantilever up or down. Both (a) prismatic slip and < c + a > pyramidal slip were investigated. The critical resolved shear stress was determined by calibrating a crystal plasticity model and found to be 329 MPa for < a > prismatic slip in both tension and compression. However significant tension-compression asymmetry was observed for < c + a > pyramidal slip; increasing to 820 MPa under compression and decreasing to 558 MPa in tension. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd.

【 授权许可】

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