固溶温度对Mg-2Gd-2Zn轧制板材显微组织和力学性能的影响<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.020.013

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Abstract Different solution treatments at 400 ℃, 430 ℃, 460 ℃, 490 ℃ and 520 ℃ were carried out on the rolled Mg-2Gd-2Zn alloy sheets under the same solution time of 0.5 h and aging treatment of 225 ℃×12 h. The effects of solution temperature on the microstructure, phases composition and mechanical properties of the alloy sheets were investigated by OM, SEM, EDS, XRD, micro-hardness and mechanical tester. Below 490 ℃, the grain size increased linearly and the number of the second phase particles decreased with the increasing solution temperature. Whereas the second phase particles suddenly increased and presented dispersed distribution at 490 ℃, which resulted in the highest micro-hardness of 77.88HV. XRD results show that the compositions of second phases have transformed from the primary phase of MgZn₂ and GdZn₅ at 430 ℃ to the precipitated phase of MgZn₂ and GdZn at 490 ℃. Therefore, under 490 ℃, the Mg-2Gd-2Zn alloy sheets present good mechanical properties with the highest tensile strength of 262 MPa, 244 MPa and 254 MPa along the direction of RD, TD and 45°, and elongation of 34%,31% and 39% with low ductility anisotropy, respectively.

Key words： rolled Mg-2Gd-2Zn alloy sheet solid solution temperature microstructure mechanical properties

Published: 05 May 2018

CLC number:

TG146.2

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	Articles by authors
	ZHU Tao
	HUANG Guangjie
	ZHOU Fang
	ZHAO Fei

Cite this article:

ZHU Tao,HUANG Guangjie,ZHOU Fang, et al. Effect of Solid Solution Temperature on Microstructure and Mechanical Properties of the Rolled Mg-2Gd-2Zn Alloy Sheets[J]. Materials Reports, 2017, 31(20): 58-62.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.020.013 OR http://www.mater-rep.com/EN/Y2017/V31/I20/58

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