Quick Search:       Advanced Search
岳晓岱,李嘉荣,刘世忠,史振学,杨万鹏,王效光.钌对一种单晶高温合金980℃和1160℃下TCP相析出影响的两面性[J].稀有金属材料与工程(英文),2021,50(1):1~6.[Yue Xiaodai,Li Jiarong,Liu Shizhong,Shi Zhenxue,Yang Wanpeng and Wang Xiaoguang.Dual Effects of Ruthenium on the TCP Precipitation of a Single Crystal Superalloy at 980℃ and 1160℃[J].Rare Metal Materials and Engineering,2021,50(1):1~6.]
Dual Effects of Ruthenium on the TCP Precipitation of a Single Crystal Superalloy at 980℃ and 1160℃
Download Pdf  View/Add Comment  Download reader
Received:April 28, 2020  
DOI:
Key words: single crystal superalloy  ruthenium  microstructure stability  topologically close-packed phase  dual effects
Foundation item:国家重点研发计划,航空动力基金项目,财政稳定支持经费资助项目,中国航发自主创新专项资金项目
Author NameAffiliation
Yue Xiaodai,Li Jiarong,Liu Shizhong,Shi Zhenxue,Yang Wanpeng and Wang Xiaoguang  
Hits: 111
Download times: 190
Abstract:
      In order to study the effect of Ru on the microstructure stability of high generation single-crystal superalloys, two single-crystal superalloys D1 and D2 containing 6wt.%Ru and 4.5wt.%Ru respectively were prepared. After complete heat treatment, they were long-term aged at 980℃ and 1160℃ for 200h. The alloy microstructure of different scales, compositions of topologically close-packed (TCP) phase and TCP crystal structures were detected. Results show that after long-term aging at 980℃ for 200h, the precipitation of TCP in D1 alloy containing more Ru is significantly higher than that in D2 alloy; after long-term aging at 1160 ℃ for 200h, no TCP phase is observed in D1 alloy, while a small amount of TCP phase is observed in D2 alloy; the TCP phases in both alloys are of the same type, and Ru is one of the main forming elements. The experimental results are analyzed combining with d-electrons concept and thermodynamic calculation. It is shown that the influence of Ru on the TCP precipitation of single crystal superalloys has two sides. On the one hand, adding Ru can increase the d-electron energy level of single crystal superalloys, which increase the TCP precipitation tendency. On the other hand, the increase of Ru content can reduce the segregation of refractory elements in γ phase, thus reducing the amount of TCP phase precipitation caused by the supersaturation of refractory elements. At different temperatures, the main influencing factors are different.