Cyclic deformation and fatigue damage in single-crystal magnesium under fully reversed strain-controlled tension-compression in the [10(1)over-bar0] direction

SCRIPTA MATERIALIA

卷:96

Article

Yu, Qin^1,2  Jiang, Yanyao¹  Wang, Jian² 

[1] Univ Nevada, Dept Mech Engn, Reno, NV 89557 USA

[2] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA

关键词: Magnesium single crystal;    Cyclic deformation;    Twinning-detwinning;    Fatigue;   

DOI  :  10.1016/j.scriptamat.2014.10.020

来源: Elsevier

【 摘 要 】

Cyclic deformation and the resulting fatigue are experimentally investigated in single-crystal magnesium subjected to fully reversed strain-controlled tension-compression in the [1 0 (1) over bar 0] direction at room temperature. Plastic instability is found near the end of the first detwinning reversal. Twin twin boundaries and secondary twins are induced by interaction of primary {1 0 (1) over bar 2} twins. Microcracks are developed at primary twin boundaries and twin twin interaction sites. Final fracture is most likely caused by cleavage-cracking on the {1 0 (1) over bar 1}-{1 0 (1) over bar 2} double twin and shearing fracture on the basal plane. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

【 授权许可】

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