Effects of precipitates and its interface on thermal conductivity of Mg–12Gd alloy during aging treatment

Journal Article · Sun Apr 15 04:00:00 EDT 2018 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2018.02.019· OSTI ID:22832969

Zhong, Liping; Wang, Yongjian; Gong, Min; Zheng, Xingwen ^[1]; Peng, Jian ^[2]

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1. College of Materials Science and Engineering, Sichuan University of Science and Engineering, Zigong 643000 (China)
2. State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing 400044 (China)

Highlights: • Hardness and thermal conductivity of alloy can be improved by aging treatment. • The interface between precipitates and matrix transformed coherent into incoherent with increasing aging time. • Coherent interface would impede the improvement of thermal conductivity of alloy. - Abstract: How to simultaneously improve the thermal conductivity and mechanical properties of Mg alloys is an interesting and important issue topic. In the present study, the effect of aging treatment on the thermal conductivity and micro-hardness of Mg–12Gd alloy was investigated. Results indicated that the thermal conductivity and micro-hardness of the alloy could be significantly improved by aging treatment, and Mg–12Gd alloy exhibited a typical aging hardening response with the increasing aging time. At the early stage of aging (4 h), a large number of fine particles precipitated from α-Mg matrix, but thermal conductivity of alloy increased a little, which was attributed to the coherent interface hindering the increase of thermal conductivity. The thermal conductivity increased to the peak value of 75.7 W/(m·K) at the aging time of 300 h, which was about 2.17 times that of as-solutionized alloy. The huge increment in the thermal conductivity of as-aged Mg–12Gd alloy was related to the precipitation of particles and the incoherent interface between precipitates and α-Mg matrix.

• OSTI ID: 22832969
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 138; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
BINARY ALLOY SYSTEMS
GADOLINIUM COMPOUNDS
HARDENING
MAGNESIUM COMPOUNDS
MICROHARDNESS
PRECIPITATION
THERMAL CONDUCTIVITY