中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 17 Special 1 November 2007 |
（1. Key Laboratory of Ministry of Education for High Temperature Materials and Tests,
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China;
2. Baosteel Technology Centre, Baoshan Iron & Steel Co. Ltd, Shanghai 201900, China）
Abstract:A nanocrystalline layer was produced on the surface of Ni3Al intermetallic by means of surface mechanical attrition treatment. The surface nanocrystallites were annealed at 250−750 ℃ for 30 min. Microstructure evolution of nanocrystallites during annealing was studied by X-ray diffraction (XRD) and transmission electronic microscope (TEM). The experimental results show that long-rang order recovers rapidly when annealing temperature is below 250 ℃ and changes slowly at 350−550 ℃, and then it increases rapidly at 750 ℃. The grain size of nanocrystallites of Ni3Al keeps stable and crystal defects recover when they are annealed below 550 ℃. The grains grow normally in low temperature annealing and abnormal growth occurs at 750 ℃.
Key words: Ni3Al; intermetallic compound; nanocrystallite
