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

1
School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China
2
School of Mechanical and Electrical Engineering, Heilongjiang Institute of Technology, Harbin 150050, China
3
Nano and Heterogeneous Material Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, China
5
State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(5), 757; https://doi.org/10.3390/ma11050757
Received: 12 April 2018 / Revised: 4 May 2018 / Accepted: 5 May 2018 / Published: 9 May 2018
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. View Full-Text
Keywords: Mg-Gd-Y-Ag-Zr alloy; rolling; thermal treatment; microstructure; mechanical property Mg-Gd-Y-Ag-Zr alloy; rolling; thermal treatment; microstructure; mechanical property
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Ning, H.; Yu, Y.; Gao, B.; Xiao, L.; Wen, L.; Yan, Z.; Li, L.; Chen, X. Grain Refinement and Aging Hardening of the Mg-10Gd-3Y-2Ag-0.4Zr Alloy Produced by a Two-Step Forming Process. Materials 2018, 11, 757.

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