Cu-3Si-2Ni合金均匀化的组织演变及扩散行为（英文）  

Microstructure evolution and diffusion behavior of a Cu-3Si-2Ni alloy during homogenizing

作　　者：王智祥[1] 叶艳君[1] 潘少彬[1] 袁孚胜[2] 陈文江[1] 金熌 

机构地区：[1]江西理工大学材料科学与工程学院,江西赣州341000 [2]中国瑞林工程技术有限公司,江西南昌330002

出　　处：《材料热处理学报》2016年第10期79-83,共5页Transactions of Materials and Heat Treatment

基　　金：National Natural Science Foundation of China(51161008)

摘　　要：为了消除铸态Cu-3Si-2Ni合金中枝晶偏析及非平衡组织对其加工性能的影响,分别在850~950℃、保温2~8 h条件下对比研究了该合金在均匀化下的元素分布、显微组织及性能变化规律。结果表明：随温度的升高及保温时间的延长,合金的偏析程度及非平衡第二相组织明显减少,合金综合力学性能均得以提高和改善,其中温度对均匀化效果的影响更为显著;在相同加热条件下,合金中Ni比Si的扩散速度更慢。并在此基础上利用扩散理论建立起相应的Ni元素均匀化动力学方程。经验证,实验值与理论计算结果基本吻合,获得该合金较佳的均匀化退火工艺为900℃×4 h。In order to eliminate the influence of dendrite segregation and non-equilibrium microstructure on processing properties of as cast Cu-3Si-2Ni alloy,microstructure,element distribution and mechanical properties of the as-cast alloy homogenized at 850-900 ℃ for 2-8 h were studied.The results show that the dendritic segregation and non-equilibrium microstructure are decreased and the mechanical properties are improved effectively for the homogenized alloy with the increasing of the annealing temperature and holding time.The influence of temperature on the homogenization is higher than the holding time.The diffusion rate of Ni in the alloy is much slower than that of Si,based on the experiment the dynamic equation of Ni element homogenization is established by diffusion theory.The proper homogenizing process for the Cu-3Si-2Ni alloy is heating at 900 ℃ for 4 h.

关 键 词：均匀化 扩散 枝晶偏析 

分 类 号：TG146.1[一般工业技术—材料科学与工程]