期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 33, 期 9, 页码 926-934出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2017.04.011
关键词
Mg-Y-Zr-Nd; Extrusion; Microstructure; Tensile properties; Precipitate
资金
- National Natural Science Foundation of China [51571043]
- National Key Research and Development Program of China [2016YFB0301101]
- International Science & Technology Cooperation Program of China [2014DFG52810]
- Ph.D. Programs Foundation of Ministry of Education of China [20130191110018]
The microstructure and mechanical properties of Mg-Y-Zr-xNd alloys with 0-2.63 wt% Nd were investigated using optical microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction and tensile testing test. Results indicated that more Mg24Y5 particles and Mg14Nd2Y (.) phases were dispersed in the matrix when Nd content increased from 0 wt% to 2.63 wt% in the extruded alloys. Consequently, the nucleation of dynamic recrystallization and the volume fraction of recrystallized grains were promoted obviously. The average grain size can be refined in the range of 4.6-1.3 mu m after the addition of 2.63 wt% Nd. The tensile strength of extruded alloys increased with increasing Nd content, and elongation exhibited an opposite change tendency. The extruded alloy sheet with 1.01 wt% Nd demonstrates optimal combination of strength and plasticity, i.e., the ultimate tensile strength, yield strength, and elongation were 273 MPa, 214 MPa, and 24.2%, respectively. Variations in mechanical properties are discussed on the basis of microstructure observations. (C) 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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