Enhancement of plastic anisotropy and drastic increase in yield stress of Mg-Li single crystals by Al-addition followed by quenching

SCRIPTA MATERIALIA

卷:172

Article

Hagihara, Koji¹  Mori, Keitaro¹  Nakano, Takayoshi² 

[1] Osaka Univ, Dept Adapt Machine Syst, Grad Sch Engn, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan

[2] Osaka Univ, Grad Sch Engn, Div Mat & Mfg Sci, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan

关键词: Mg-alloys;    Orientation dependence;    Strengthening;    Dislocation;    Single crystal;   

DOI  :  10.1016/j.scriptamat.2019.07.012

来源: Elsevier

【 摘 要 】

Strong orientation dependence of yield stress was found in a body-centered cubic (bcc)-structured Mg-Li alloy single crystal by adding 5 at.% of Al combined with rapid quenching, which was negligible in Mg-Li binary single crystals. Furthermore, the addition of 5 at.% of Al combined with rapid quenching caused an extreme increase in yield stress up to similar to 470 MPa; this compares to similar to 50 MPa in a Mg-Li binary crystal. Increased valence-electron to atom ratio and development of chemical modulation in the alloy by Al-addition are probable causes of the enhancement of plastic anisotropy and the drastic increase in yield stress, respectively. (C) 2019 Published by Elsevier Ltd on behalf of Acta Materialia Inc.

【 授权许可】

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