重熔温度对半固态挤压铜合金轴套组织性能的影响  

Effect of Remelting Temperature on Microstructure and Properties of Semi-solid Extruded Copper Alloy Bushing

作　　者：肖寒[1] 陈昊 熊迟 陈磊 张雄超 周瑀杭 崔鋆昕 XIAO Han;CHEN Hao;XIONG Chi;CHEN Lei;ZHANG Xiongchao;ZHOU Yuhang;CUI Yunxin(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《材料导报》2022年第17期176-180,共5页Materials Reports

基　　金：国家自然科学基金(51965028);云南省基础研究计划项目(202001AT070031)。

摘　　要：对铜合金进行热处理可显著改善其性能,但铜合金半固态浆料制备过程对其微观组织和力学性能的影响也不容忽略。本工作将轧制铜合金在890℃、910℃、930℃、950℃四个重熔温度下保温15 min,然后挤压成形。研究不同重熔温度对半固态挤压铜合金的微观组织、元素分布、拉伸性能、断口分析、布氏硬度的影响。结果表明:随着重熔温度的升高,半固态挤压铜合金的平均晶粒直径先逐渐增大随后减小;液相率一直增加,由12.7%增加到了19.2%;形状因子先减小后增加;抗拉强度逐渐减小;延伸率逐渐增加;断裂方式逐渐由脆性断裂变为解理断裂和韧性断裂的混合型断裂方式,断口由平整光滑逐渐转变为河流花样、解理平台和少量韧窝交错;布氏硬度先增加随后逐渐降低,当重熔温度为910℃时,布氏硬度达到最大值126HBW。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 126 HBW.

关 键 词：铜合金 半固态 重熔温度 微观组织 力学性能 

分 类 号：TG146.11[一般工业技术—材料科学与工程]