Effect of Interactions Among Elements on Diffusion Process Associated with γ'Coarsening in a Ni-Based Single-Crystal Superalloy

• 作者: Dong-Qing Qi Guang-Lei Wang Hai-Feng Zhang Ji-De Liu Jin-Lai Liu Xiao-Feng Sun Xu-Dong Sun Yi-Zhou Zhou
• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2020,（7）
• 页码范围: 1013-1020
• 页数: 8页
• 语种: 英文

摘要

Coarsening of cuboidal γ'precipitates and relevant diffusion process in Ni-based single-crystal superalloy CMSX-4 were investigated at 1000,1020 and 1040 ℃ for specific times.The γ'coarsening kinetics followed a cubic rate law with time and was presumably controlled by bulk diffusion of elements in γ matrix.The associated diffusion activation energy was experimentally determined to be about 300 kJ/mol when it is considered the temperature-dependent thermo-physical parameters in modified Lifshitz-Slyozov-Wagner theory.The influence of temperature on γ/γ'microstructure is briefly discussed based on pseudo-binary[Ni]-[Al]phase diagram.Interactions among elements can effectively raise the local vacancy formation and vacancy-atom exchange barriers close to γ-and γ'-partitioning elements,respectively.Thus,it can significantly reduce the inter-coupling migrations of atoms during the macroscopic cross-diffusion process associated with γ'coarsening of Ni-based superalloys.

作者信息

序号	姓名	单位	发文数	被引次数	H指数	G指数
1	Guang-Lei Wang	中国科学院金属研究所	1	0	0.0	0.0
2	Dong-Qing Qi	中国科学院金属研究所	1	0	0.0	0.0
3	Ji-De Liu	中国科学院金属研究所	1	0	0.0	0.0
4	Jin-Lai Liu	中国科学院金属研究所	1	0	0.0	0.0
5	Yi-Zhou Zhou	中国科学院金属研究所	1	0	0.0	0.0
6	Xu-Dong Sun	中国科学院金属研究所	1	0	0.0	0.0
7	Hai-Feng Zhang	中国科学院金属研究所	1	0	0.0	0.0
8	Xiao-Feng Sun	中国科学院金属研究所	1	0	0.0	0.0