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.
[1] CHEN L Y, XU J Q, CHOI H, et al.Processing and properties of magnesium containing a dense uniform dispersion of nanoparticles[J]. Nature, 2015, 528(7583): 539-543. [2] 金培鹏. 轻金属基复合材料[M]. 北京: 国防工业出版社, 2013: 80-133. JIN Peipeng.Light Metal Matrix Composites[M]. Beijing: National Defense Industry Press, 2013: 80-133. [3] 武高辉. 金属基复合材料发展的挑战与机遇[J]. 复合材料学报, 2014, 31(5): 1228-1237. WU Gaohui.Development challenges and opportunities of metal matrix composites[J]. Journal of Composite Materials, 2014, 31(5): 1228-1237. [4] BAKSHI S R, LAHIRI D, AGARWAL A, et al.Carbon nanotube reinforced metal matrix composites-a review[J]. International Materials Reviews, 2010, 55(1): 41-64. [5] CASATI R, VEDANI M.Metal matrix composites reinforced by nano-particles—a review[J]. Metals-Open Access Metallurgy Journal, 2014, 4(1): 65-83. [6] YE H Z, LIU X Y.Review of recent studies in magnesium matrix composites[J]. Journal of Materials Science, 2004, 39(20): 6153-6171. [7] 张荻, 张国定, 李志强. 金属基复合材料的现状与发展趋势[J]. 中国材料进展, 2010, 29(4): 1-7. ZHANG Di, ZHANG Guoding, LI Zhiqiang.The current state and trend of metal m atrix composites[J]. Chinese Material Progress, 2010, 29(4): 1-7. [8] 权高峰. SiC颗粒增强镁基复合材料的研究[J]. 西安交通大学学报, 1997 (6): 121-123. QUAN Gaofeng.Study on SiC particle reinforced magnesium matrix composites[J] Journal of Xi’an Jiaotong University, 1997(6): 121-123. [9] SHEN M J, WANG X J, YING T, et al.Characteristics and mechanical properties of magnesium matrix composites reinforced with micron/submicron/nano SiC particles[J]. Journal of Alloys & Compounds, 2016, 686: 831-840. [10] BHINGOLE P, CHAUDHARI G, NATH S, et al.Processing, microstructure and properties of ultrasonically processed in situ MgO-Al2O3-MgAl2O4 dispersed magnesium alloy composites[J]. Composites Part A: Applied Science and Manufacturing, 2014, 66(66): 209-217. [11] QI L H, WEI X L, ZHANG T, et al.Effect of fabrication parameters on carbon fibre reinforced magnesium matrix composite components[J]. Materials Science & Technology, 2016, 33(1): 77-83. [12] LIAO H, CHEN J, PENG L, et al.Fabrication and characterization of magnesium matrix composite processed by combination of friction stir processing and high-energy ball milling[J]. Materials Science and Engineering A, 2017, 683: 207-214. [13] 董群, 陈礼清, 赵明久, 等. 镁基复合材料制备技术、性能及应用发展概况[J]. 材料导报, 2004, 18(4): 86-90. DONG Qun, CHEN Liqing, ZHAO Mingjiu, et al.Fabrication, properties and application of magnesium matrix cmposites[J]. Material Guide, 2004, 18(4): 86-90. [14] HASSAN S F, Gupta M.Development of a novel magnesium/nickel composite with improved mechanical properties[J]. Journal of Alloys & Compounds, 2002, 335(1/2): 10-15. [15] HASSAN S F, GUPTA M.Development of high strength magnesium based composites using elemental nickel particulates as reinforcement[J]. Journal of Materials Science, 2002, 37(12): 2467-2474. [16] TUN K S, GUPTA M.Development of magnesium/(yttria+ nickel) hybrid nanocomposites using hybrid microwave sintering: Microstructure and tensile properties[J]. Journal of Alloys & Compounds, 2009, 487(1/2): 76-82. [17] BU F, YANG Q, GUAN K, et al.Study on the mutual effect of La and Gd on microstructure and mechanical properties of Mg-Al-Zn extruded alloy[J]. Journal of Alloys & Compounds, 2016, 688: 1241-1250.
2018, Vol. 23 
