Suppressing the tension–compression yield asymmetry of Mg alloy by hybrid extension twins structure

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 567; pp. 9 - 13
• Main Authors: Xin, Yunchang, Zhou, Xiaojun, Liu, Qing
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 01-04-2013; Elsevier
• Subjects: Applied sciences; Elasticity. Plasticity; Exact sciences and technology; Extension twinning; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Mg alloy; Pre-straining; Strengthening; Strengthening; Mg alloy; Pre-straining; Extension twinning; Crystal twin; Crystal orientation; Predeformation; Stress strain relation; Twinning; Rolling direction; Compression test; Tension test; Asymmetry; Hot rolling; Magnesium alloy; Microstructure; Grain refinement
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2012.12.094

A hybrid extension twin structure generated by a cross compression of the hot-rolled Mg alloy along the transverse direction (TD) and the rolling direction (RD) is employed to reassign the crystallographic orientation along RD, TD and normal direction (ND). The orientation redistribution leads to multi-deformation modes during both the compression and the tension deformation. The grain refinement by twin lamellas and the crystallographic orientation redistribution greatly reduces the tension–compression yield asymmetries along RD, TD and ND in the pre-strained sample. The corresponding mechanism are studied and discussed, too.