Effect of Mo Addition on Microstructural Characteristics in a Re-containing Single Crystal Superalloy

作     者：X.G.Liu L.Wang L.H.Lou J.Zhang 

作者机构：Superalloys DivisionInstitute of Metal ResearchChinese Academy of Sciences Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of Sciences 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2015年第31卷第2期

页      面：143-147页

核心收录：

学科分类：0806[工学-冶金工程] 0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：the Shanghai Synchrotron Radiation Facility (SSRF) the financial support of the project from the National Basic Research Program of China (No.2010CB631201) the National High Technology Research and Development Program of China (No.2012AA03A511 and No.2012AA03A513) 

主　　题：Superalloy Molybdenum Microstructure Partitioning 

摘      要：The effect of Mo addition on microstructural characteristics of a nickel-base single crystal superalloy containing 4 wt% Re was investigated. The γ/γ’ partitioning ratios determined by energy dispersive spectrometer attached to a transmission electron microscope showed that the addition of Mo enhanced the partitioning of Re,W and Cr in the g matrix while decreased the concentration of Ta in the matrix. Synchrotron radiation diffraction was adopted to measure the γ/γ’ lattice misfit at room temperature. The results indicated that Mo addition changed the γ/γ’ lattice misfit towards larger negative as well as increased the tetragonal distortion of the γ lattice. Additionally,Mo addition led to microstructural instability and altered the precipitation behavior of topologically close-packed phases during 1100 C exposure. Instead of precipitating directly from the matrix,the μ phase was observed to be converted from the α phase which precipitated preferentially as a metastable intermediate in the alloy with high Mo content.