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Materials (Basel). 2018 May 9;11(5). pii: E757. doi: 10.3390/ma11050757.

Grain Refinement and Aging Hardening of the Mg-10Gd-3Y-2Ag-0.4Zr Alloy Produced by a Two-Step Forming Process.

Author information

1
School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China. ninghuiyan2000@163.com.
2
School of Mechanical and Electrical Engineering, Heilongjiang Institute of Technology, Harbin 150050, China. ninghuiyan2000@163.com.
3
School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China. yandong_yu@163.com.
4
Nano and Heterogeneous Material Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. gaobo@njust.edu.cn.
5
Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, China. xiaolr620@126.com.
6
School of Mechanical and Electrical Engineering, Heilongjiang Institute of Technology, Harbin 150050, China. wenlihua518@126.com.
7
School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China. yanzehua5290@163.com.
8
Nano and Heterogeneous Material Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. lili_smse@njust.edu.cn.
9
State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China. chenxuefei@lnm.imech.ac.cn.

Abstract

Grain refinement and precipitation are two effective ways to improve the mechanical properties of Mg-RE alloys. In this work, a two-step forming process is proposed. This includes cold rolling and subsequent annealing at high temperature for a short duration. By the two-step forming process, grains can be refined from 100 μm to 20 μm in compare with ~30 μm by common hot rolling at 450 °C for a reduction of 80%. The sample shows more distinct aging hardening, as the hardness amplification of 60 HV is twice that of the hot-rolled sample. The precipitation is observed by high angle annular dark field-scanning transmission electron microscopy (HAADF-STEM). Dynamic precipitation in the sample by the two-step route is found to be effectively suppressed. Interestingly, after subsequent annealing, the density of precipitation, especially β′, become much higher than that in hot-rolled samples.

KEYWORDS:

Mg-Gd-Y-Ag-Zr alloy; mechanical property; microstructure; rolling; thermal treatment

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