Effect of Ti/Nb/Ta addition on the γ/γ' coherent microstructure in low-density and high-strength Co-Al-W-Mo-based superalloys  

作　　者：Jinlin Li Jiaqi Zhang Zhen Li Qing Wang Chuang Dong Fen Xu Lixian Sun Peter K.Liaw 

机构地区：[1]School of Materials Science and Engineering,Engineering Research Center of High Entropy Alloy Materials(Liaoning Province),Dalian University of Technology,Dalian 116024,China [2]School of Aeronautics and Astronautics,Shenyang Aerospace University,Shenyang 110136,China [3]School of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China [4]Guangxi Collaborative Innovation Center of Structure and Property for New Energy Materials,Guangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin 541004,China [5]Department of Materials Science and Engineering,The University of Tennessee,Knoxville,37996,TN,USA

出　　处：《Journal of Materials Science & Technology》2024年第19期174-187,共14页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52171152,91860108 and U1867201);the Key Discipline and Major Project of Dalian Science and Technology Innovation Foundation(No.2020JJ25CY004);Guangxi Key Laboratory of Information Laboratory Foundation(No.221013-K);Peter K.Liaw very much appreciates the support from the National Science Foundation(Nos.DMR-1611180,1809640,and 2226508).

摘　　要：Coherent precipitation of cuboidal γ'-Co3(Al,W) nanoparticles in face-centered-cubic (FCC)-γ matrix is of great significance for improving high-temperature mechanical properties of Co-based superalloys. The present work developed a series of low-density Co-based superalloys in light of the cluster composition formula of [Al1-(Co,Ni)12]((Al0.5(Ti/Nb/Ta)0.5W0.5)(Mo0.5Cr0.5Co0.5)), where the addition of Ti, Nb, and Ta is mixed with an equimolar ratio. It is found that these designed alloys with different combinations of Ti/Nb/Ta, Ti/Nb, and Ti/Ta possess the coherent microstructure of cuboidal γ' nanoprecipitates in the FCC-γ matrix. The microstructural evolution of coherent γ/γ' during aging at 1173 K shows that these superalloys exhibit higher thermal stability at high temperatures. Even after aging for 1000 h, there do not exist any other precipitated phases on grain boundaries, except the coarse γ' precipitates. Also, the coarsening rate constants of cuboidal γ' nanoprecipitates in these alloys are very low (K = 5.76-6.03 nm3/s), which is mainly ascribed to a moderate lattice misfit (ε = 0.28 %-0.45 %) between γ and γ'. The stable γ/γ' microstructure renders the alloys with prominent mechanical properties, as evidenced by the high yield strength of σYS = 438-445 MPa at 1143 K. A large amount of stacking faults appear after compressive deformation and Lomer-Contrell dislocation locks are also formed due to the reaction of partial dislocations of stacking faults. Moreover, the microhardness (285-320 HV) in each alloy keeps almost constant with the aging time. Besides, these superalloys have a relatively lower density (8.67-8.89 g/cm3), among which the alloy containing Ti0.25Ta0.25 also exhibits a much higher γ' solvus temperature (1361 ± 2 K) than those of the existing Co-Al-W-based superalloys.

关 键 词：Co-based superalloys Coherent microstructure Lattice misfit Particle coarsening Mechanical properties 

分 类 号：TG14[一般工业技术—材料科学与工程]