Sintering kinetics and mechanism of nano Al2O3 particles dispersion strengthened copper by spark plasma sintering
JIANG Shaowen1, CHENG Lijin2, LIU Yao1, LIU Shaojun1,3
1. Powder Metallurgy Research Institute, Central South University, Changsha 410083, China; 2. State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China; 3. Shenzhen Research Institute, Central South University, Shenzhen 518057, China
Abstract：The effects of nano Al2O3 particles on Al2O3 dispersion strengthened copper prepared by spark plasma sintering (SPS) were studied systematically by using the hot-pressing sintering model. The results show that the densification process is dominated by grain boundary diffusion and sliding in the early stage of sintering, followed by the grain boundary sliding. And the plastic deformation occurs in the last stage of sintering. The density of the copper strengthened by Al2O3 particles decreases. The Al2O3 particles existing along the grain boundaries can inhibit the densification of copper because the particles can block the movement of grain boundaries and dislocation, which indicates that the densification process required higher activation energy. The deformation mode is mainly twinning, which is resulted from co-existence of the shear stress and the pinning of Al2O3 particles.
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2018, Vol. 23 
