Structure and Migration Characteristic of Heterointerfaces During the Phase Transformation from L12 to DO（22） Phase

• Published in: Journal of Wuhan University of Technology. Materials science edition no. 5; pp. 814 - 819
• Main Author: ZHANG Mingyi CHEN Zheng WANG Yongxin ZHANG Jing ZHAO Yan LU Yanli
• Format: Journal Article
• Language: English
• Published: 2010
• Subjects: 合金元素; 微观相场模型; 微观组织演变; 界面结构; 畴结构; 相变温度; 迁移特性
• ISSN: 1000-2413; 1993-0437

Based on the microscopic phase-field model, the structure and migration characteristic of ordered domain interfaces formed between DO22 and L12 phase are investigated, and the atomistic mechanism of phase transformation from L12 （Ni3Al） to DO22 （Ni3V） in Ni75AlxV25-x alloys are explored, using the simulated microstructure evolution pictures and the occupation probability evolution of alloy elements at the interface. The results show that five kinds of heterointerfaces are formed between DO22 and L12 phase and four of them can migrate during the phase transformation from L12 to DO22 except the interface （002）D//（001）L. The structure of interface （100）D//（200）L and interface （100）D//（200）L·^1/2[001] remain the same before and after migration, while the interface （002）D//（002）L is formed after the migration of interface （002）D//（002）L·^1/2[100] and vice versa. These two kinds of interface appear alternatively. The jump and substitute of atoms selects the optimization way to induce the migration of interface during the phase transformation, and the number of atoms needing to jump during the migration is the least among all of the possible atom jump modes.