Microstructure, Processing Properties and Plastic Deformation Behavior of an Extruded Mg-Y-Ni-Co Alloy
BI Guangli1,2,*, RAN Jishang1,2, MAN Hongsheng3, JIANG Jing1,2, MENG Shuaiju1,2, BI Guangkuo4, WANG Haidong5, LI Yuandong1,2
1 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China 2 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China 3 Jinchuan Group Precision Copper Co., Ltd., Jinchang 737100, Gansu, China 4 Jilin Jianlong Iron & Steel Co., Ltd., Jilin 132000, Jilin, China 5 School of Applied Technology, Changchun Institute of Technology, Changchun 130012, China
Abstract: The microstructure, processing properties and plastic deformation behavior of an extruded Mg-2Y-0.5Ni-0.5Co (at%) alloy were investigated by optical microscopy (OM), X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and universal experiment machine. The microstructure of the extruded alloy mainly consisted of α-Mg, lamellar and blocky 18R-LPSO phase distributed along the extrusion direction, MgY(Co,Ni)4 phase, and fine strip-like 14H-LPSO phase in the grain interior. Tensile test results showed that the extruded alloy had good room temperature plasticity and its elongation to failure was higher than 15%. With increasing temperature and decreasing strain rate, the tensile strengths of the alloy decreased, while the plasticity increased. The alloy exhibited quasi-super plasticity with elongation to failure of 117.87% and 143.9% at 300 ℃ under the strain rates of 1×10-4 s-3 and 1×10-4 s-1, respectively. The constructed thermal processing profile was optimized for the stable processing interval of the extruded alloy: 275—300 ℃ with strain rates from 1×10-4 s-1 to 1×10-3 s-1. The deformation behavior of the extruded alloy varied with temperature and strain rate. At low temperatures (RT—200 ℃) and different strain rates, the deformation mechanism of the alloy was dominated by dislocation slip. At high temperature (300 ℃) and low strain rates (1×10-4 s-1 and 1×10-3 s-1), the deformation mechanism of the alloy was dislocation slip coordinated by grain boundary slip.
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2024, Vol. 38 
