Fabrication of a high strength Mg–11Gd–4.5Y–1Nd–1.5Zn–0.5Zr (wt%) alloy by thermomechanical treatments

A high strength Mg–11Gd–4.5Y–1Nd–1.5Zn–0.5Zr (wt%) alloy has been successfully fabricated via hot extrusion, cold rolling and ageing treatment. The alloy exhibits an average 0.2% proof stress (YS) of 481.6±19.9MPa, an average ultimate tensile strength (UTS) of 517.4±27.5MPa and an average elongation...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2015-01, Vol.622, p.121-130
Main Authors: Yu, Zijian, Huang, Yuanding, Qiu, Xin, Wang, Guanfu, Meng, Fanzhi, Hort, Norbert, Meng, Jian
Format: Article
Language:English
Subjects:
Cold rolling
Elongation
Failure
High strength
Magnesium alloy
Magnesium base alloys
Mechanical properties
Mechanical property
Microstructure
Surface layer
Texture
Thermomechanical treatment
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Summary:A high strength Mg–11Gd–4.5Y–1Nd–1.5Zn–0.5Zr (wt%) alloy has been successfully fabricated via hot extrusion, cold rolling and ageing treatment. The alloy exhibits an average 0.2% proof stress (YS) of 481.6±19.9MPa, an average ultimate tensile strength (UTS) of 517.4±27.5MPa and an average elongation to failure of 2.0±0.4% at room temperature. The best mechanical property obtained in the present study has a YS of 502.0MPa, an UTS of 546.8MPa and an elongation to failure of 2.6%. The high strength of this alloy is attributed to the fine grains, stacking faults (SFs), long period stacking ordered (LPSO) phase, and precipitates of Mg5RE phase at grain boundaries and of β′ phase inside the grains. Cold rolling improves the mechanical properties and enhances the ageing hardening response, but decreases the ductility. Two texture components are found simultaneously in the deformed alloy. One is the typical Mg–RE texture and another one is the unusual prismatic texture.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2014.10.077