High temperature deformation behavior of Al2O3/Cu composites

被引：0

作者：

Zhang X. ^{[1
]}

Wei X. ^{[1
]}

Liu M. ^{[1
]}

Yang K. ^{[1
]}

Zhu S. ^{[1
]}

Jiang M. ^{[1
]}

机构：

[1] School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou

来源：

Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2017年 / 34卷 / 08期

关键词：

Al[!sub]2[!/sub]O[!sub]3[!/sub]/Cu composite; Constitutive equation; High temperature deformation; Microstructure evolution; Stress-strain curve;

D O I：

10.13801/j.cnki.fhclxb.20161107.001

中图分类号：

学科分类号：

摘要：

The flow behavior and microstructure evolution of Al2O3/Cu composites, which conducted at deformation temperature of 300-900℃ and strain rate of 0.01-10 s-1, were investigated by using Gleeble-1500 thermal simulator and TEM analysis. A constitutive equation of the peak value yield stress-deformation temperature-strain stress was also defined based on the Zener-Hollomn parameter and Arrhenius equation. The results show that the stress-strain curve of the composites is a typical softening mechanism of dynamic recrystallization type, and the curve consists of work hardening, dynamic softening and stabilization stage. The peak value of stress decreases with the increase of deformation temperature or the decrease of strain rate. In addition, the material parameters of the composites are obtained as follows: the structure factor lnA of 15.2391, the stress level parameter α of 0.020788 mm2/N, the stress exponent n of 5.933035, and the deformation activation energy Q of 2.1697×105 kJ/mol. With increasing of deformation temperature, the dislocation density in the matrix is gradually decreased, and an obviously recrystallization feature appears. However, in the case of isothermal compression, the dislocation density is increased at first, and then decreased, with increasing of strain rates. According to the microstructure evolution and hot processing maps, the optimum processing condition for good hot workability of Al2O3/Cu composites can be summed up as: temperature range 500-850℃ and strain rate range below 0.1 s-1. © 2017, Chinese Society for Composite Materials. All right reserved.

引用

页码：1825 / 1832

页数：7

共 27 条

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