期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 35, 期 11, 页码 2477-2484出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2019.07.028
关键词
Mg-Li alloys; Texture; I-phase; Mechanical anisotropy; Fracture
资金
- Strategic New Industry Development Special Foundation of Shenzhen [JCYJ20170306141749970]
- National Natural Science Foundation of China [51871211, 51701129]
- Natural Science Foundation of Guangdong Province [2018A030313950]
- International Joint Laboratory for Light Alloys
- National Key Research and Development Program of China [2017YFB0702001, 2016YFB0301105]
- Liaoning BaiQianWan Talents Program
- Institute of Metal Research (IMR),Chinese Academy of Sciences (CAS)
Through investigating and comparing microstructure and crystallographic texture of as-extruded Mg-14Li and Mg-14U-6Zn-1Y (in wt%) alloys, the differences in their mechanical anisotropy were investigated. It revealed that the formation of I-phase (Mg3Zn6Y, icosahedral structure) can effectively refine grain size. Moreover, compared with Mg-14Li alloy, the texture type of Mg-14Li-6Zn-1Y alloy changed slightly, but its texture intensity decreased remarkably. As a result, the stronger texture contributed to the normal mechanical anisotropy of Mg-14Li alloy with higher tensile strength and a lower elongation ratio along transverse direction (TD) than those along extrusion direction (ED). However, for Mg-14Li-6Zn-1Y alloy, the zonal distribution of I-phase particles along ED caused abnormal mechanical anisotropy, i.e. higher tensile strength and better plasticity along ED. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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