Extension twin variant selection during uniaxial compression of a magnesium alloy

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:550

Article

Pei, Y.¹  Godfrey, A.¹  Jiang, J.¹  Zhang, Y. B.²  Liu, W.¹  Liu, Q.³ 

[1] Tsinghua Univ, Dept Mat Sci & Engn, Adv Mat Lab, Beijing 100084, Peoples R China

[2] Tech Univ Denmark, Riso Natl Lab Sustainable Energy, Mat Res Div, Danish Chinese Ctr Nanomet, DK-4000 Roskilde, Denmark

[3] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400045, Peoples R China

关键词: Magnesium alloys;    Twinning;    Variant selection;    EBSD;    Crystal plasticity;   

DOI  :  10.1016/j.msea.2012.04.046

来源: Elsevier

【 摘 要 】

Samples of the magnesium alloy AZ31 have been deformed by compression to strains of 5% and 10% and microstructural observations made to investigate the activation of specific {1 0 (1) over bar 2} extension twin variants. The twinning has been analyzed on a grain-by-grain basis for more than 260 grains to determine both the number of extension twin variants in each grain, and the volume fraction of each. At 5% strain approx. 30% of the grains contain twins corresponding to variants with the third or lower ranked Schmid factor, with the fraction increasing to 40% after 10% compression. A grain size effect is also observed in that smaller grains are less likely to contain lower ranked twin variants. For both 5% and 10% compression no clear relationship exists between the volume fraction of each twin variant in a given grain population and the Schmid factor for the twin variant. A positive linear relationship can be defined, however, between the maximum twinning fraction that a twin variant can reach and its Schmid factor. (c) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

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