Temperature gradient driving interdiffusion interface and composition evolution in Ni-AI-Cr alloys  

作　　者：Yong-Sheng Li Hui-Yu Wang Jing Chen Shuai-Ge Yang Peng Sang Hong-Li Long 

机构地区：[1]School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing,210094,China [2]Key Laboratory of Advanced Metallic and Intermetallic Materials Technology,Ministry of Industry and Information Technology of People’s Republic of China,Nanjing,210094,China

出　　处：《Rare Metals》2022年第9期3186-3196,共11页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.51571122);the Fundamental Research Funds for the Central Universities(No.30921013107)。

摘　　要：The interdiffusion interface microstructures and composition evolution of Ni-Al-Cr/Ni-Al-Cr layered alloys under different temperature gradients were studied using phase-field simulation.A precipitate-free zone forms near the interface of the layered alloys,and the interface does not move with time under temperature gradients.When Cr concentrations in the alloy layers are different,Al diffuses from a low-to high-temperature region,whereas Cr from a high-to low-temperature region.The width of the precipitate-free zone changes from 0.5 to 2.5μm as the temperature gradient changes fromΔT=0.625 K·μm^(−1) to 1.250 K·μm^(−1);the width of the interdiffusion zone is also enlarged.Additionally,the temperature gradient promotes the interdiffusion of elements through the interface.In contrast,when the initial Al concentration is different in the alloy layers,an uphill diffusion of Al occurs,which is driven by the chemical potential of Al.

关 键 词：SUPERALLOY INTERDIFFUSION Interface microstructure PHASE-FIELD 

分 类 号：TG146.15[一般工业技术—材料科学与工程]