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Achieving Exceptional High Ductility in Binary Mg–6Zn Alloy Wire by Grain Boundary Strengthening and Twinning‐Induced Plasticity
Author(s) -
Yan Kai,
Cheng Honghui,
Liu Yi,
Liu Huan,
Fang Shuangquan,
Bai Jing
Publication year - 2021
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.202001476
Subject(s) - materials science , crystal twinning , microstructure , ultimate tensile strength , grain boundary , metallurgy , alloy , plasticity , elongation , grain boundary strengthening , ductility (earth science) , extrusion , deformation (meteorology) , strain hardening exponent , composite material , creep
Mg–6Zn alloy wires are prepared by the combination of hot direction extrusion and multi‐pass hot drawing. The tensile results show that this technology achieves an exceptional tensile elongation of about 18%, as well as the yield strength of 175 MPa and the ultimate tensile strength of 310 MPa when the drawing temperature is 350 °C. Meanwhile, it also exhibits the highest strain‐hardening data compared with the other wire samples. The microstructure characterizations show that the near single‐phase α‐Mg microstructure with the MgZn 2 nanoprecipitates on grain boundaries and it can significantly produce twin intersections and stacking faults under cold bending deformation. The exceptional high elongation can be attributed to the grain boundary strengthening of nanoprecipitates and twinning‐induced plasticity.