Constitutive Equation and Thermal Processing Map of Spray Formed AlSi25Cu4Mg Wear Resistant Alloy
HU Yusheng1,2, FENG Di3, ZHOU Jiandang4, ZHU Tian3, ZHANG Hao4, ZHANG Jie4, FAN Xi4, SONG Feidao4
1 State Key Laboratory of Air-conditioning Equipment and System Energy Conservation, Zhuhai 519070, China 2 Gree Electric Appliances,Inc.of Zhuhai, Zhuhai 519000, China 3 School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China 4 Jiangsu Haoran Spray Forming Alloy Co, Zhenjiang 212003, China
Abstract: The hot deformation behavior of a spray formed AlSi25Cu4Mg wear resistant alloy were investigated using Gleeble-3500 test machine at 623—723 K with strain rates from 0.001 s-1 to 5 s-1, and the constitutive equation including Zener-Hollomon parameter (Z parameter) and processing map were established. Results revealed that the activation energy of the spray formed high Si content aluminum alloy was 194.8 kJ/mol, the flow stress rises with the decreasing of deformation temperature and the increase of strain rate. Processing map exhibited a high power dissipation degree of 31%, which indicates a high dynamic soften degree when the alloy deformed with low Z parameter values. The spray formed AlSi25Cu4Mg alloy showed an excellent deformation ability during hot extrution with the temperature range of 713—723 K and the strain rate below 1 s-1. After aging, the tensile strength along extrusion direction of thealloy was 487 MPa. The hardness has reached to 187HV, which satisfies the property requirement.
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2020, Vol. 34 
