Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 856, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.158201
Keywords
Mg-RE alloy; Sm; Precipitate; Dislocation; Twinning
Categories
Funding
- National Natural Science Foundation of China [51571084]
- China Scholarship Council [201908410208, JP19k23566]
- Japan Society for the Promotion of Science
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By adding Sm, the microstructure of Mg-5Y-2Nd-xSm-0.5Zr alloys was refined, leading to a significant decrease in grain size as Sm content increased. The alloy exhibited improved compressive strength and maximum strain with the addition of Sm.
Herein, we studied the microstructural evolution and deformation behavior of aged Mg-5Y-2Nd-xSm-0.5Zr (x = 1, 3, and 5 wt%) alloys during uniaxial compression at room temperature by transmission electron microscopy and quasi-in-situ electron backscatter diffraction techniques. The microstructures of Mg-5Y-2Nd-xSm-0.5Zr alloys are refined by the addition of Sm, with more occurrences of Mg(Nd, Sm) precipitates. The average grain size decreased significantly with increasing Sm content, from 80.4 mu m (1 wt% Sm) to 64.8 mu m (3 wt% Sm) and 50.0 mu m (5 wt% Sm). The Mg-5Y-2Nd-3Sm-0.5Zr alloy exhibited a maximum compressive strength of 390.1 MPa and a maximum strain (epsilon) of 0.103 at room temperature; {10-12} tensile twinning and dislocation slips are the main plastic deformation modes of Mg-5Y-2Nd-xSm-0.5Zr alloys during compression at room temperature. A number of < a > and < c + a > dislocations were observed in the aged Mg-5Y-2Nd-3Sm-0.5Zr alloy. The optimized ductility value is attributable to grain refinement; elemental Sm promotes the activation of the non-basal < c + a > slip dislocations and interactions between twins and < c + a > dislocations. The strengthening mechanism mainly includes solid solution, fine-grain, and precipitation strengthening. (C) 2020 Elsevier B.V. All rights reserved.
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