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Strengthening Effect and Texture of Mg–3Li Alloys Strengthened by Various Rare‐Earth Elements
Author(s) -
Bao Lei,
Le Qichi,
Zhang Zhiqiang
Publication year - 2018
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.201700491
Subject(s) - materials science , crystal twinning , extrusion , grain boundary , alloy , metallurgy , slip (aerodynamics) , recrystallization (geology) , texture (cosmology) , ductility (earth science) , rare earth , grain size , microstructure , thermodynamics , paleontology , physics , creep , artificial intelligence , biology , computer science , image (mathematics)
Three Mg–3Li–0.4Zr alloys strengthened by various rare‐earth elements (RE: Gd, Nd, and Ce) are prepared and studied to obtain the strengthening effect and texture. The results indicate that Gd exhibits a dramatic strength enhancement with minimum ductility decrease compared with Nd and Ce, which is primarily attributed to the effective pinning effect by the solid dissolved Gd atoms and a great amount of dispersing and homogeneously distributing precipitates with the size from nanometers to decades of nanometers. Moreover, the grain boundary segregated Gd is able to restrain the movement of grain boundaries, which is also the primary strengthening mechanism of Nd and Ce elements. Aging treatment shows improvement on mechanical properties of the three RE‐containing alloys, but with little obvious effect. At last, Gd‐containing Mg–3Li–0.4Zr alloy has good application potential as a kind of new superlight structural material. Pyramidal < c + a > slip and tension twinning are the primary mechanisms in the early stage of the extrusion process. Basal < a > slip becomes the primary mechanism accompanied by the transfer of texture from extrusion texture to RE‐texture (< a > parallel to extrusion direction) when the complete dynamic recrystallization is achieved.