Ni颗粒增强AZ61复合材料的微观组织和力学性能

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Abstract Ni particle reinforced AZ61 composites with the Ni mass fraction of 3%,6% and 9% respectively were prepared by closed semi-solid stirring casting and hot extrusion, and the microstructure, mechanical properties and strengthening mechanism were studied. The results show that the reinforcement phases of Ni_p/AZ61 composite are the fine Mg₂Ni phase and large AlNi phase, and their sizes are 2-4 μm and 10-20 μm, respectively. The Mg₂Ni and AlNi phases can effectively refine the grains, promote recrystallization, and have a good bonding with the magnesium matrix. Dislocation pile-up are present around the particles and twins are present in the matrix. Both Mg₂Ni and AlNi phases can effectively improve the hardness, elastic moduous and tensile strength, but the elongation decreases. 9%Ni_p/AZ61 has tensile strength 286.5±1.2 MPa and elongation of and 4.3%±0.9%. The strengthening mechanism of Ni_p/AZ61 are fine grain strengthening, Orowan strengthening and load transfer effect.

Key words： Ni particles AZ61 magnesium alloy composites microstructure mechanical properties

Received: 18 April 2018 Published: 19 July 2019

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	FENG Yan
	CHEN Chao
	WANG Richu
	WANG Xiaofeng

Cite this article:

FENG Yan,CHEN Chao,WANG Richu, et al. Microstructure and mechanical properties of Ni particles reinforced AZ61 composites[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(6): 562-568.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I6/562

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