Coarsening Behavior ofγ′Precipitates and Compression Performance of Novel Co-Ni-Al-W Superalloy  

新型Co-Ni-Al-W高温合金γ'析出相粗化行为及压缩性能

作　　者：Zhou Cheng Jin Lei Jing Gaoyang Yu Boyan Zhao Jun 周成;金磊;荆高扬;于伯岩;赵军(中国机械总院集团沈阳铸造研究所有限公司,辽宁沈阳110022;高端装备铸造技术全国重点实验室,辽宁沈阳110022)

机构地区：[1]Shenyang Research Institute of Foundry Co.,Ltd,China Academy of Machinery,Shenyang 110022,China [2]National Key Laboratory of Advanced Casting Technologies,Shenyang 110022,China

出　　处：《稀有金属材料与工程》2024年第10期2786-2793,共8页Rare Metal Materials and Engineering

基　　金：Natural Science Foundation of Liaoning Province(2023-MSLH-337)。

摘　　要：The coarsening behavior ofγʹprecipitate phase at different temperatures and the compressive performance of novel Co-Ni-Al-W superalloy were investigated.Experiment results show that the evolution of the mean radius and volume fraction of theγʹphase obeys the classical Lifshitz-Slyozov-Wagner model.The coarsening rate of theγʹphase exhibits a significant dependence on the aging temperature,which increases from 1.30×10^(−27)m^(3)/s at 800℃to 9.56×10−27 m^(3)/s at 900℃.The activation energy ofγʹphase is mainly influenced by the W diffusion in theγmatrix,presenting as 210 kJ/mol.The prepared Co-Ni-Al-W alloy possesses superb comprehensive properties,particularly the good combination of highγʹsolvus temperature(1221℃)and low density(8.7 g/cm^(3)).Besides,the compressive yield strength of the Co-Ni-Al-W alloy at ambient and high temperatures are higher than that of otherγʹ-strengthened Co-based superalloys.The compressive yield strength of the Co-Ni-Al-W alloy at 850℃is as high as 774 MPa.研究了一种新型Co-Ni-Al-W高温合金的γ'析出相在多种温度条件下的粗化行为及合金的压缩性能。实验结果表明,合金在时效过程中,γ'相平均半径和体积分数的演化遵循经典的Lifshitz-Slyozov-Wagner模型。γ'相的粗化速率显著依赖于时效温度,具体表现为从800℃时的1.30×10-27m^(3)/s增加到900℃时的9.56×10^(-27)m^(3)/s。γ'相的活化能主要受W元素在γ基体中的扩散影响,其活化能为210kJ/mol。所制备的Co-Ni-Al-W合金表现出优异的综合性能,特别是具有高γ'相溶解温度(1221℃)和低密度(8.7 g/cm^(3))的良好结合。此外,Co-Ni-Al-W合金在常温和高温下的压缩屈服强度均高于其他γ'强化的Co基高温合金,且该合金在850℃下的压缩屈服强度高达774MPa。

关 键 词：Co-Ni-Al-W superalloy γʹphase coarsening behavior compressive performance 

分 类 号：TG146.16[一般工业技术—材料科学与工程]