Effect of thermal cycling treatment on the strength and thermal conductivity of graphite flakes/Al composites

被引：0

作者：

Liu X. ^{[1
,2
]}

Wang W. ^{[2
]}

Chen L. ^{[3
]}

Wang D. ^{[2
]}

Jiang Y. ^{[1
]}

Xiao B. ^{[2
]}

Ma Z. ^{[2
]}

机构：

[1] College of Science, Shenyang Ligong University, Shenyang

[2] Institute of Metal Research, Chinese Academy of Sciences, Shenyang

[3] State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang

来源：

Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2021年 / 38卷 / 04期

关键词：

Al matrix composite; Bending strength; Graphite flake; Thermal conductivity; Thermal cycling;

D O I：

10.13801/j.cnki.fhclxb.20201110.001

中图分类号：

学科分类号：

摘要：

The graphite flakes reinforced Al matrix composites (50vol%Gf/6061Al) were fabricated by powder metallurgy technique. The Gf had a well bonding with Al matrix without cracks and pores. The composites were exposed to a thermal cycling test in the temperature range of −50-120℃. The microstructure and properties of 50vol%Gf/6061Al were examined when the composites were tested by 10, 50, 100 and 200 thermal cycles. The density of the composites is almost unchanged under different thermal cycles. With the number of the thermal cycle increasing, the Gf in the composites are cracked due to the stress from the difference of the thermal expansion coefficient between Gf and Al matrix. The strength and thermal conductivity of the composite are decreased with the number of the thermal cycle increasing. After 100 thermal cycles, the bending strength decreases by 27.4% and thermal conductivity decreases by 11.5% compared to that of the sample without thermal cycles. The broken Gf and the cracked interface between Gf and Al matrix could release the thermal stress, therefore, the cracking of the Gf would be retarded. The microstructure and properties of the composites are not serious changed. After 200 thermal cycles, the bending strength decreases by 32% and TC decreases by 13.1% compared to that of the sample without thermal cycles. Copyright ©2021 Acta Materiae Compositae Sinica. All rights reserved.

引用

页码：1192 / 1199

页数：7

共 25 条

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