有色金属科学与工程2026，Vol.17Issue(1)：65-74,10.DOI:10.13264/j.cnki.ysjskx.2026.01.008
Ta、Ti对镍基单晶高温合金中γ和γ′相元素分配行为的影响
Effect of Ta and Ti on the elemental partitioning behavior of the γ and γ′ phases in Ni-based single crystal superalloy
摘要
Abstract
The microstructure of γ′ phase,the γ/γ′ lattice misfit,and partitioning behavior of alloying elements in four Ni-12.5%Al-8.31%Co-6.25%Cr-1.06%Mo-2.06%W-x Ta-(3.12%-x)Ti(x=0,1.04%,2.08%,3.12%,atomic fraction)alloys were investigated using a scanning electron microscope,X-ray diffraction,a scanning transmission electron microscope,and first-principles calculations.The results show that as u/v(where u presents the atomic content of Ta,and v represents the sum of Ta and Ti atomic contents)increases from 0 to 1,the shape parameter of γ′phase gradually decreases from 0.54 to 0.46.The absolute value of lattice misfit decreases from 0.245%to 0.198%.When u/v=0.66,the γ′ phase reaches its maximum average size(233 nm)and volume fraction(74.8%).In all four alloys,Al,Ta and Ti have a preference for the γ′ phase,while Cr,Mo and Co prefer to the γ phase.In contrast,W elements exhibit a transition from initial preference for the γ'phase into the γ phase.Except for Co,other elements tend to partition to the γ'phase.However,due to the stronger partitioning driving force of Ta and W,Cr and Mo are displaced into the γ phase.In addition,compared with W,Ta possesses a higher partitioning driving force,leading to part of W being displaced into the γ′ phase and resulting in an"inverse partitioning"phenomenon of W.关键词
镍基单晶高温合金/合金元素/微观组织/分配行为/第一性原理计算Key words
Ni-based single crystal superalloy/alloying elements/microstructure/partitioning behavior/first-principles calculation分类
矿业与冶金引用本文复制引用
付江,闵小华,鹿超..Ta、Ti对镍基单晶高温合金中γ和γ′相元素分配行为的影响[J].有色金属科学与工程,2026,17(1):65-74,10.基金项目
国家重点研究发展计划资助项目(2019YFA0705302) （2019YFA0705302）
