半固态挤压铸造ZCuSn10铜合金的组织演变  

Microstructure evolution of ZCuSn10 copper alloy prepared by semi-solid squeeze casting

作　　者：肖寒[1] 陈泽邦 陆常翁 卢德宏[1] 蒋业华[1] 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

出　　处：《材料热处理学报》2015年第12期37-43,共7页Transactions of Materials and Heat Treatment

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(20125314120013);云南省应用基础研究面上项目(2014FB131);云南省教育厅科学研究基金重点项目(2015Z031)

摘　　要：对ZCu Sn10铜合金坯料进行液态浇注和半固态挤压成形,通过组织演变的分析,研究不同工艺对ZCu Sn10铜合金半固态挤压液固协同流动性的影响。结果表明,不同工艺对ZCu Sn10铜合金挤压组织液固协同流动性影响不同,在930℃保温40 min挤压速率为12 mm/s可获得固液协同流动较好的挤压成形件组织。相同挤压工艺条件,半固态挤压成形件各个位置组织差异较大。近冲头位置保持初始半固态组织;试样中部位置为固液两相共存的半固态组织、固相颗粒圆整度较高;试样最前端的微观组织中以液相为主,固液两相分布均匀性较差。Experiments of liquid pouring forming and semi-solid squeeze casting of ZCu Sn10 copper alloy billets were carried out. The effects of different processes on the flow of liquid-solid two phases of semi-solid extrusion of ZCu Sn10 copper alloy were investigated through the analysis of microstructure evolution. The results indicate that the effects of different process parameters on the flow of liquidsolid of semi-solid extrusion of ZCu Sn10 copper alloy are different. The good microstructure of the ZCu Sn10 copper alloy can be obtained by semi-solid squeeze casting at forming temperature of 930 ℃ with holding time of 40 min and extrusion velocity of 12 mm / s. The microstructure of different position of the semi-solid extrusion parts is different at the same extrusion process conditions. The microstructure of near punch position is the initial semi-solid microstructure. The microstructure of middle position of the sample is semi-solid microstructure with solid-liquid two phases and high roundness solid particle. The microstructure of the front end of the sample is mainly liquid phase microstructure and the uniformity of the solid-liquid two phases distribution is poor.

关 键 词：ZCu Sn10铜合金 半固态挤压 液固协同流动 组织演变 

分 类 号：TG146.1[一般工业技术—材料科学与工程]