冷轧-重熔SIMA法制备半固态ZCuSn10铜合金的组织研究  

Microstructure of Semi-Solid ZCuSn10 Copper Alloy Fabricated by SIMA Process with Cold-Rolling and Re-Melting

作　　者：吴龙彪[1] 肖寒[1] 王佳[1] 卢德宏[1] 周荣锋[1,2] 周荣[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]昆明理工大学分析测试研究中心,云南昆明650093

出　　处：《稀有金属》2015年第3期214-220,共7页Chinese Journal of Rare Metals

基　　金：云南省应用基础研究重点项目(2011FA007);高等学校博士学科点专项科研基金项目(20125314120013);云南省应用基础研究面上项目(2014FB131)资助

摘　　要：采用冷轧-重熔的应变诱导熔化激活(SIMA)法制备半固态ZCu Sn10铜合金坯料,分析不同重熔工艺对半固态组织的影响。结果表明:采用冷轧-重熔的SIMA法能制备出理想的半固态坯料。重熔过程中ZCu Sn10合金组织中低熔点的(α+δ)共析组织及枝晶α相与(α+δ)共析组织连接处的过渡区域会逐渐熔化,形成液相,并使得α固相枝晶逐渐熔断,成为α固相颗粒。在850/875℃重熔时,半固态组织中的液相量较少,晶粒黏连较严重,晶粒的球化效果较差。半固态坯料的液相量随保温时间的延长而增加,保温时间从10 min延长至20 min,在850℃重熔时,液相量从6.7%增加到8.5%;875℃重熔时,液相量从17.1%增加到19.6%。900℃保温获得的半固态组织均匀,球化效果好。随着保温时间的增加,半固态坯料的液相先由24.3%增加至30.9%后减小至25.1%,液相的减少是由金相试样取样位置或金相组织分析测量的误差造成的;在相同的重熔保温时间下,重熔温度越高液相的析出速度越快,液相量越大。The semi-solid ZCuSnl0 copper alloy was fabricated by strain induced melt activated （SIMA） method with cold-rolling and re-melting. The effect of re-melting process on microstructure of semi-solid ZCuSnl0 copper alloy was investigated. The results in- dicated that the ideal semi-solid billets could be fabricated by SIMA method with cold-rolling and re-mehing. During the re-melting process, （ a ＋ δ） eutectoid with low melting point and the transition zone of high Sn content were melt firstly in the ZCuSnl0 alloy, re- sulting in the formation of liquid phase, and the dendrite became a solid phase particles gradually. When re-melting at 850 and 875 ℃, the amount of liquid phase decreased, the grains were in a state of mutual adhesion, and the spheroidization of the grains became poor. The liquid fraction of semi-solid ZCuSnl0 copper alloy increased with the increase of the holding time from 10 to 20 min, the liq- uid fraction increased from 6.7% to 8.5% at the re-melting temperature of 850 ℃ and it increased from 17.1% to 19.6% at the re- melting temperature of 875 ℃. The semi-solid ZCuSnl0 copper alloy with uniform and spherical grains could be obtained at the re- melting temperature of 900 ℃, the liquid fraction of semi-solid ZCuSnl0 copper alloy first increased from 24.3% to 30.9% , and then decreased to 25.1% with the holding time increasing; the reasons for the decrease of liquid fraction were the different locations of the samples or the analysis error of the microstructure of semisolid ZCuSnl0 copper alloy. Moreover, the higher the re-melting temperature was, the faster the precipitation of liquid was at the same holding time, so the liquid fraction increased.

关 键 词：ZCuSn10铜合金 半固态 SIMA法 冷轧 组织 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG249.9[金属学及工艺—金属材料]