期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 721, 期 -, 页码 577-585出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.05.164
关键词
Magnesium; Alloying Nanocrystalline; Plastic deformation; Density-functional theory calculations; Thermal stability
资金
- Program for New Century Excellent Talents in University from Chinese Ministry of Education, National Natural Science Foundation of China [51225102, 201203932203]
- Ministry of Education and Science of the Russian Federation (Program for Universities)
- 8thLiu da Ren cai Gao feng from Jiangsu Province, China [B932203]
- Jiangsu Key Laboratory of Advanced Nanomaterials and Technologies
Fabricating bulk coarse-grain Mg alloys into nanocrystallines (NCs) via severe plastic deformation along with remaining the thermal stability of nanostructures has been a challenging issue. Here we employed high-pressure torsion at room temperature to prepare nanocrystalline (NC) Mg-Gd-Y-Zr alloy with an average grain size of 80 nm. The appearance of NC structures was associated with stacking fault formation, due to the lowering of stacking fault energy by Gd and Y according to the density-functional theory (DFT) calculations. The NC Mg-Gd-Y-Zr alloy showed high thermal stability up to 250 degrees C, which is comparable with that of its coarse-grained and fine-grained counterpart. This high thermal stability against nanograin growth was caused by stable precipitation at grain boundaries. Therefore, alloying Mg with Gd and Y not only helped with formation of NCs, but also improved the thermal stability. (C) 2017 Elsevier B.V. All rights reserved.
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