Effect of High Energy Milling on the Microstructure and Mechanical Properties of Mg-Zn-Zr Alloy
LI Xiaoqiang, LI Shangpeng, DING Yanlin, MA Guojun, JIN Peipeng
Qinghai Provincial Key Laboratory of New Light Alloys,Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming, Qinghai University, Xining 810016
Abstract: High-energy milling of Mg alloy powder was conducted in argon atmosphere, and then the cold-pressing, hot-pressing sintering and hot extrusion of the milled powder was performed. The microstructure and mechanical properties of the as-extruded samples at different ball milling conditions was studied. The results indicated that with the increasing milling time, the particle size was refined to 8 μm, and grain size was about 34 nm, oxidation of the powders still occurred during the process, nano-MgO particles were also produced. Precipitated phase (MgZn2) existed in the extruded alloys, and uniformly distributed in the Mg matrix. With refined particles, the material performance was significantly improved, when the milling time was up to 10 h, the ultimate tensile strength and compress yield strength of the as-extruded samples were 365 MPa and 325 MPa, respectively, the ultimate compression strength kept in 466 MPa. When the milling time was 25 h, the average particle size of the powders was about 8 μm, accompanied with increased surface energy and thickened oxide film of the particles, which resulted in the bad combination between particles and opposite effect on the mechanical properties of the material.
李小强, 李尚鹏, 丁艳林, 马国俊, 金培鹏. 高能球磨对Mg-Zn-Zr合金微观组织与力学性能的影响*[J]. 《材料导报》期刊社, 2017, 31(18): 77-80.
LI Xiaoqiang, LI Shangpeng, DING Yanlin, MA Guojun, JIN Peipeng. Effect of High Energy Milling on the Microstructure and Mechanical Properties of Mg-Zn-Zr Alloy. Materials Reports, 2017, 31(18): 77-80.
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2017, Vol. 31 
