Effect of ruthenium on γ' precipitation behavior and evolution in single crystal superalloys  

Ru对单晶高温合金中γ′相析出行为和演化的影响(英文)

作　　者：刘丽荣[1] 金涛[2] 刘金来[2] 孙晓峰[2] 胡壮麒[2] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]中国科学院金属研究所,沈阳110016

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第1期14-22,共9页中国有色金属学报（英文版）

基　　金：Project(U1037601) supported by the National Natural Science Foundation of China

摘　　要：The effect of Ru on γ＇ precipitation behavior and evolution in single crystal superalloys with different Ru contents were investigated by scanning electron microscopy with energy dispersive spectroscopy,3D atomic probing,differential scanning calorimetry.The results show that the solvus of the γ＇ phase decreases gradually with increasing Ru content in the alloys by casting or by the same solution and aging treatments,the alloy with a larger Ru content yields a smaller γ＇ phase.The addition of Ru increases the growth rate and coarsening rate of the γ＇ phase.Ru mainly distributes in the γ phase,which causes more Re and Mo partition into the γ＇ phase,increasing the absolute value of mismatch and the rafting rate of the γ＇ phase.采用扫描电镜、3D原子探针、示差热分析等方法研究了合金元素Ru对单晶高温合金中γ′相的析出和演化过程的影响。研究结果表明:γ′的溶解温度随着Ru含量的增加而逐渐降低。铸态下以及固溶处理和时效处理后,γ′相尺寸都随着Ru含量的增加而减小。Ru的加入加快了γ′相的长大和粗化速率,Ru主要分布在γ′基体中。Ru的加入使更多的Mo和Re等元素向γ′相分配,导致错配度的绝对值增大,同时加快γ′相的形筏速率。

关 键 词：single crystal superalloy RUTHENIUM gamma prime PRECIPITATION growth rate coarsening rate MISMATCH 

分 类 号：TG132.32[一般工业技术—材料科学与工程]