时效温度对ni-al-v 合金筏化影响的微观相场模拟 - 中国有色金属学报.pdf

21 4 2011 4 Vol.21 No.4 The Chinese Journal of Nonferrous Metals Apr. 2011 1004-0609(2011)04-0882-06 Ni-Al-V 2 1, 2 2 2 (1. 710072 2. 710072) Ni75Al25−xVx DO22 L12 L12 DO22 DO22 DO22 Ni75Al25−xVx TG111.5 A Microscopic phase-field simulation of influence of ageing temperature on raft in Ni-Al-V alloys 2 1, 2 2 2 YANG Kun , CHEN Zheng , ZHANG Ming-yi , WANG Yong-xin (1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China; 2. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China) Abstract: Based on the microscopic phase-field kinetic model and Ni75Al25−xVx alloy, the influences of ageing temperature on the competitive growth mechanism and raft structure were studied. The results show that the growth and coarsening of phase is a competitive process. It will form raft structure when the number of DO22 is less and the size is larger, causing L12 phase growing along the same direction. The precipitate phases appear earlier at a low temperature. There is more DO grain and not obvious raft structure at lower temperature if L1 phase precipitates first. There is less 22 2 DO22 grain and obvious raft structure at lower temperature if DO22 phase precipitates first. Key words: Ni Al V alloy; microscopic phase-field; raft; ageing temperature 75 25−x x