| MERALS AND METAL MATRIX COMPOSITES |
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| Effect of Remelting Temperature on Microstructure and Properties of Semi-solid Extruded Copper Alloy Bushing |
| XIAO Han*, CHEN Hao, XIONG Chi, CHEN Lei, ZHANG Xiongchao, ZHOU Yuhang, CUI Yunxin
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| Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China |
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Abstract The heat treatment of the copper alloy has a significant effect on the improvement and promotion of its performance, and the influence of the preparation process of the semi-solid copper alloy slurry on the microstructure and mechanical properties cannot be ignored.This work studies the microstructure, element distribution, tensile performance, fracture analysis, brinell hardness of the semi-solid extruded copper alloy at four remelting temperatures of 890 ℃, 910 ℃, 930 ℃ and 950 ℃ for 15 min. The results show that with the increase of remelting temperature, the average grain diameter increases at first and then decreases, that the liquid phase ratio increases from 12.7% to 19.2%, that the shape factor decreases at first and then increases, that the tensile strength decreases and that the elongation increases gradually. Tensile fracture gradually changes from brittle fracture to mixed mode of cleavage fracture and ductile fracture. Fracture surface changes from flat and smooth to river pattern, cleavage platform and a small number of dimples. Brinell hardness increases at first and then decreases gradually. When remelting temperature is 910 ℃, Brinell hardness reaches the maximum value of 126HBW.
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Published: 10 September 2022
Online: 2022-09-10
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| Fund:National Natural Science Foundation of China (51965028) and Yunnan Fundamental Research Projects (202001AT070031). |
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2022, Vol. 36 
