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Microstructure evolution of nanostructured Ni_3Al during annealing

Microstructure evolution of nanostructured Ni_3Al during annealing
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摘要 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 ℃ . 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℃.
作者 任江伟 单爱党 刘俊亮 张俊宝 宋洪伟
机构地区 Key Laboratory of Ministry of Education for High Temperature Materials and Tests Baosteel Technology Centre
出处 《中国有色金属学会会刊：英文版》 CSCD 2007年第A01期69-73,共5页 Transactions of Nonferrous Metals Society of China
基金 Project(0452nm053) supported by the Nano-Materials Program of Shanghai City of China
关键词 镍 铝 合金 金属互化物 纳米晶体 Ni3Al intermetallic compound nanocrystallite
分类号 TB383.1 [一般工业技术—材料科学与工程]
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参考文献26

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中国有色金属学会会刊：英文版
2007年 第A01期

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