Microstructure and mechanical properties of Ni particles reinforced AZ61 composites
FENG Yan1,2, CHEN Chao1,2, WANG Richu1,2, WANG Xiaofeng1,2
1. Key Laboratory of Hunan Province for Electronic Packaging and Advanced Functional Materials,Central South University, Changsha 410083, China; 2. College of Materials Science and Engineering, Central South University, Changsha 410083, China
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 Nip/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%Nip/AZ61 has tensile strength 286.5±1.2 MPa and elongation of and 4.3%±0.9%. The strengthening mechanism of Nip/AZ61 are fine grain strengthening, Orowan strengthening and load transfer effect.
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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2018, Vol. 23 
