Microstructure evolution of nanostructured Ni3Al during annealing

• Published in: Transactions of Nonferrous Metals Society of China Vol. 17; no. A01; pp. 69 - 73
• Main Author: 任江伟 单爱党 刘俊亮 张俊宝 宋洪伟
• Format: Journal Article
• Language: English
• Published: 01.11.2007
• Subjects: 纳米晶体; 金属互化物
• ISSN: 1003-6326

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℃.