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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Microstructure evolution of nanostructured Ni3Al during annealing
REN Jiang-wei(任江伟)1, SHAN Ai-dang(单爱党)1, LIU Jun-liang(刘俊亮)2,
ZHANG Jun-bao(张俊宝)2, SONG Hong-wei(宋洪伟)2

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

ISSN 1672-7029
CN 43-1423/U

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