Unexpected influence of prismatic plate-shaped precipitates on strengths and yield anisotropy in an extruded Mg-0.3Ca-1.0In-0.1Al-0.2Mn (at.%) alloy

SCRIPTA MATERIALIA

卷:169

Article

Nakata, T.¹  Bhattacharyya, J. J.²  Agnew, S. R.²  Kamado, S.¹ 

[1] Nagaoka Univ Technol, Nagaoka, Niigata, Japan

[2] Univ Virginia, Charlottesville, VA USA

关键词: Mg alloy;    Precipitates;    Strength modeling;    Crystal plasticity;    Yield anisotropy;   

DOI  :  10.1016/j.scriptamat.2019.05.015

来源: Elsevier

【 摘 要 】

The stress-strain response of an extruded Mg-0.3Ca-1.0In-0.1Al-0.2Mn (at. %) alloy containing prismatic plate shaped precipitates was measured. An Elasto-Viscoplastic Self-Consistent polycrystal plasticity code was used to evaluate the effect of precipitation hardening on individual deformation modes. The results reveal the precipitates (whose shape is ideal according to the Orowan bowing model) are sheared by basal dislocations, limiting their strengthening effect, and the ratio of the strength of prismatic slip to that of extension twinning is increased, resulting in an increase in the tension-compression yield anisotropy. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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