期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 643, 期 -, 页码 28-33出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.04.118
关键词
Mg-Gd-Zn-Zr-alloy; Equal-channel angular pressing (ECAP); Grain refinement; Rolling; Mechanical property
资金
- National Natural Science Foundation of China [51141002]
- Jiangsu Provincial Natural Science Foundation of China [BK20131373]
- Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology [ASMA201404]
A fine-grained Mg-1.8Gd-1Zn-0.1Zr (at.%) alloy with long-period stacking ordered (LPSO) phase was obtained via solid-solution(SS) treatment plus multi-pass equal-channel angular pressing(ECAP). The effects of post-ECAP rolling on microstructure change and deformation characteristic of the Mg alloy were investigated. The results showed that the fine-grained alloy after 16 ECAP passes at 658 K had a yield strength of 334.4 MPa with an elongation of 22.5%. Grain refinement with LPSO formation simultaneously improved the strength and ductility of the ECAPed alloy, indicating a good plastic formability. The ECAPed Mg sheet was easily rolled at 773 K from 1.5 mm to 0.24 mm in thickness without edge cracking. After rolling, the fine-grained Mg alloy exhibited higher tensile strength with appropriate elongation. The post-ECAP rolling has been successfully used in the high productivity of Mg thin sheet with good mechanical properties. (C) 2015 Elsevier B.V. All rights reserved.
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