摘要
The interfacial defects of hard magnetic Pr2Fe14B phase from amorphous t o nanostructures have been investigated by positron lifetime spectroscopy. The n anostructure was produced by melt-spinning and nanocrystallization route. The t wo main components can be ascribed to vacancy-like defects in the intergranular layers or the interfaces,and microvoids or large free volumes with size compar ed to several missing atoms at the interactions of the （atomic） aggregates or the crystallites. The remarkable changes in the positron lifetimes from the amor phous structure to the nanocrystructure with varied sizes can be interpreted,in dicating that the structural transformation and the grain growth induce the defe ct changes occurring at the interfaces with different shapes and sizes.
The interfacial defects of hard magnetic Pr_2Fe_(14)B phase from amorphous t o nanostructures have been investigated by positron lifetime spectroscopy. The n anostructure was produced by melt-spinning and nanocrystallization route. The t wo main components can be ascribed to vacancy-like defects in the intergranular layers or the interfaces,and microvoids or large free volumes with size compar ed to several missing atoms at the interactions of the (atomic) aggregates or the crystallites. The remarkable changes in the positron lifetimes from the amor phous structure to the nanocrystructure with varied sizes can be interpreted,in dicating that the structural transformation and the grain growth induce the defe ct changes occurring at the interfaces with different shapes and sizes.
出处
《中国有色金属学会会刊：英文版》
CSCD
2004年第4期654-659,共6页
Transactions of Nonferrous Metals Society of China
基金
Project(Wu 191/4 1)supportedbytheLandBaden W櫣rttembergandMax Planck Institutf櫣rMetallforschung ,Germany ,aswellastheDeutscheForschungsgemeinschaft
Project( 0 3 0 3 0 4B2 )sponsoredbytheScientificResearchFoundationfortheRe
