Premium
Microstructure and Mechanical Properties of a Two‐Phase Mg–Li Alloy Processed By Constrained Groove Pressing
Author(s) -
Wang Zongshen,
Zhang Bin,
Zhou Wei,
Zhu Lihua,
Zheng Hongyu,
Guan Yanjin,
Zhai Wengang
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.202000614
Subject(s) - materials science , microstructure , ultimate tensile strength , alloy , grain size , indentation hardness , ductility (earth science) , homogeneity (statistics) , dynamic recrystallization , elongation , phase (matter) , composite material , metallurgy , recrystallization (geology) , hot working , creep , organic chemistry , chemistry , paleontology , statistics , mathematics , biology
Constrained groove pressing (CGP), as a novel severe plastic deformation method, is applied to a two‐phase Mg–Li alloy at room temperature, 373 K, 423 K, and 473 K. The microstructural evolution and mechanical properties of Mg–Li alloy sheets during CGP are investigated. The optimum mechanical properties are achieved at 373 K after two passes. The tensile strength and yield strength are 157 MPa and 145 MPa, respectively, with a moderate elongation to failure of 12.4%, and the average micro‐hardness is about 63 HV. At 373 K, high‐density dislocations induced by CGP are preserved to enhance the strength and microhardness. The cross‐orientation procedure improves the deformation homogeneity and results in strength increase and ductility recovery at later stages. Increasing temperature weakens the homogeneity improvement and grain refinement with strain accumulation. The β‐Li phase is refined faster than α‐Mg phase, and grain sizes about 1 μm are observed in β‐Li phase. Dynamic recrystallization (DRX) first occurs in the soft and ductile β‐Li phase at 423 K. The grain refinement induced by DRX in β‐Li phase is counteracted by grain coarsening in α‐Mg phase, which causes no obvious enhancement of mechanical properties at higher temperatures of 423 K and 473 K.