添加Ru对镍基单晶高温合金组织的影响  

Effects of Ru Addition on the Microstructures of the Ni-Based Single Crystal Superalloys

作　　者：杜云玲 牛建平[2] 王新广[1] 刘金来[1] 刘纪德[1] 周亦胄[1] 金涛[1] 孙晓峰[1] Du Yunling;Niu Jianping;Wang Xinguang;Liu Jinlai;Liu Jide;Zhou Yizhou;Jin Tao;Sun Xiaofeng(Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;Shenyang University, Shenyang 110044, China)

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016 [2]沈阳大学,辽宁沈阳110044

出　　处：《稀有金属材料与工程》2018年第4期1248-1253,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51601192;51671188;51401210);国家高技术研究发展计划("863"计划)(2014AA041701)

摘　　要：研究了添加Ru对镍基单晶高温合金铸态、热处理及长期时效组织的影响。结果表明:添加Ru导致合金的共晶含量升高、一次枝晶间距降低,固溶热处理困难。添加Ru后合金的层错能显著降低,基体中出现的扩展位错会阻碍后续位错的运动,有助于提高合金力学性能。1100℃长期时效时,添Ru加对筏化过程影响不显著,未改变TCP相的主要析出类型,但显著抑制了TCP相的析出;随时效时间的延长(如超过500 h),添加Ru对TCP相的抑制作用减弱。The effects of ruthenium（Ru） addition on the microstructures of Ni-based single crystal superalloys as-cast, post-heat treated and long term aged（at 1100 ℃） were investigated by optical microscope（OM）, scanning electron microscope（SEM） and transmission electron microscope（TEM）. The results show that Ru addition increases the content of eutectic and reduces primary dendritic arm spacing.The solution heat treatment of the 3 Ru alloy is more difficult. The stacking fault energy of the γ matrix obviously decreases after Ru addition, and the extended dislocations in the γ matrix may impede the movement of the following dislocations during plastic deformation and improve the mechanical properties significantly. During long term aging at 1100 ℃, Ru addition has no significant effects on the rafting process, and does not change the main type of topologically close-packed（TCP） phase. However, the precipitation process of TCP phase is suppressed after Ru addition. As the aging time is prolonged, the suppression effect of Ru addition is weakened（over 500 h）.

关 键 词：RU 长期时效 TCP相 镍基单晶高温合金 

分 类 号：TG113.1[金属学及工艺—物理冶金] TG146.15[金属学及工艺—金属学]