纳米氧化铝弥散强化铜的放电等离子体烧结动力学及机制

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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.

Key words： Al₂O₃ dispersion strengthened copper spark plasma sintering (SPS) sintering kinetics twin densification

Received: 07 April 2017 Published: 12 July 2019

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	JIANG Shaowen
	CHENG Lijin
	LIU Yao
	LIU Shaojun

Cite this article:

JIANG Shaowen,CHENG Lijin,LIU Yao, et al. Sintering kinetics and mechanism of nano Al₂O₃ particles dispersion strengthened copper by spark plasma sintering[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(4): 354-360.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I4/354

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