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Materials 2018, 11(5), 757; https://doi.org/10.3390/ma11050757

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
4
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.
Received: 12 April 2018 / Revised: 4 May 2018 / Accepted: 5 May 2018 / Published: 9 May 2018
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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. 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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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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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