Partitioning behavior and lattice misfit of γ/γ’phases in Ni-based superalloys with different Mo additions  

作　　者：Zhe Ma Yan-Ling Pei Liang Luo Lu Qin Shu-Suo Li Sheng-Kai Gong 

机构地区：[1]School of Materials Science and Engineering,Beihang University,Beijing 100191,China

出　　处：《Rare Metals》2021年第4期920-927,共8页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.U1435207,51371007 and 51671015);the National Defense Basic Scientific Research Program of China(No.A2120132006)。

摘　　要：A low-density single crystal(LDS) alloy with the composition of high Mo content was designed.The extra 1.5 wt% Mo was added in the Alloy A with the composition of Ni-6.5 Al-8.0 Mo-2.4 Cr-6.2 Ta-4.9 Co-1.5 Re-(0.01-0.05) Y(wt%) to study the influence of Mo on the lattice parameter and partitioning behavior.Scanning electron microscope(SEM) with energy-dispersive spectrometer(EDS),transmission electron microscopy(TEM)and high-temperature X-ray diffraction(HT-XRD) were used to observe the microstructure,analyze the elemental content and measure the lattice parameter of the alloys.The natural lattice misfit was calculated by lattice constants which were measured by HT-XRD at the temperature from 25 to 1150℃,and the results showed that the lattice misfit would be more and more negative with temperature increasing.It was found that 1.5 wt% addition of Mo will increase the absolute value of the lattice misfit of γ/γ’phases and the volume fraction of γ’,and at the same time,influence the elemental distribution in γ and γ’ phases,especially Re and Cr.Re has a higher partitioning ratio(k) after the addition of Mo.

关 键 词：Ni-based superalloys MO Lattice misfit High-temperature X-ray diffraction(HT-XRD) Partitioning behavior 

分 类 号：TG132.3[一般工业技术—材料科学与工程]