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1Microstructure evolution of nanostructured Ni_3Al during annealing显示文摘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 ℃ .任江伟 单爱党 刘俊亮 张俊宝 宋洪伟 2007中国有色金属学会会刊:英文版2007,17,A01:0
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