摘要
对大塑性变形应变诱导熔化激活法制备的半固态ZCuSn10P1铜合金浆料进行了组织演变与元素偏析研究,重点分析等温处理时间对浆料特征的影响。结果表明:大塑性变形铜合金在900℃进行不同时间的半固态等温处理,随着等温处理时间延长,平均晶粒尺寸逐渐增加,由1 min时的21.1μm增加至10 min时的68.8μm;形状因子先增加后降低,先由1 min的0.31升高至5 min的0.76,再降低至10 min时的0.56;液相率由1 min的3.1%升高至5 min时的9.3%后处于稳定;锡元素在晶粒上的扩散层厚度由1 min时的0.422μm增加至10 min时的1.704μm,并且锡元素在液膜与晶粒心部的含量与等温时间呈指数关系。最佳等温处理条件为900℃等温5 min,此时半固态铜合金平均晶粒尺寸为29.6μm,形状因子为0.76,液岛尺寸为3.1μm,比常规应变诱导熔化激活法制备的半固态铜合金的平均晶粒尺寸减小了58.9%,形状因子提高了28.8%,液岛尺寸减小了31.1%,并且弱化锡元素的偏析。
The microstructure evolution and element segregation of semi-solid ZCuSn10P1 copper alloy slurry prepared by large plastic deformation strain-induced melting activation method were studied,and the influence of isothermal treatment time on slurry characteristics was analyzed.The results show that the average grain size increases from 21.1μm at 1 min to 68.8μm at 10 min with the increase in isothermal treatment time at 900℃.The shape factor firstly increases and then decreases,from 0.31 at 1 min to 0.76 at 5 min,and then decreases to 0.56 at 10 min.The liquid phase ratio increases from 3.1%at 1 min to 9.3%at 5 min and remains stable.The diffusion layer thickness of Tin increases from 0.422μm at 1 min to 1.704μm at 10 min,and the content of Tin in liquid film and grain core is exponentially related to the isothermal time.The optimum isothermal treatment condition is 900℃for 5 min.At this time,the average grain size,shape factor and liquid island size of the semi-solid copper alloy are 29.6μm,0.76 and 3.1μm respectively.The average grain size and shape factor of the semi-solid copper alloy prepared by conventional strain-induced melting activation method are reduced by 58.9%and increased by 28.8%,respectively.The liquid island size is reduced by 31.1%,and the segregation of tin element is weakened.
作者
张庆彪
陈磊
孙震
陶阳
陈昊
肖寒
Zhang Qingbiao;Chen Lei;Sun Zhen;Tao Yang;Chen Hao;Xiao Han(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)
出处
《稀有金属材料与工程》
北大核心
2025年第6期1500-1506,共7页
Rare Metal Materials and Engineering
基金
国家自然科学基金(52365047)
昆明理工大学分析测试基金(2022M20212130095)。
关键词
铜合金
半固态
大塑性变形
等温时间
显微组织
元素偏析
copper alloy
semi-solid
severe plastic deformation
isothermal time
microstructure
element segregation
