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爆炸壓結(jié)Nd-Fe-B永磁體微觀結(jié)構(gòu)
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TG146.4

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國(guó)家自然科學(xué)基金（50071035）和上海市自然科學(xué)基金（02ZE14054）


Grain-Boundary Structure of Explosively Compacted Nd-Fe-B Magnets
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    摘要:

    利用透射電鏡、X射線衍射儀、X射線能譜儀，對(duì)爆炸壓結(jié)Nd-Fe-B永磁合金進(jìn)行微觀組織結(jié)構(gòu)的觀察和分析。結(jié)果表明：爆炸壓結(jié)Nd-Fe-B的組織主要由基體Nd2Fe14B相、富O相和富Nd相組成；基體相是硬磁相，四方晶體結(jié)構(gòu)，其晶格常數(shù)為a=0．88nm和c=1．22nm；富O相形貌呈三角狀或?qū)訝睿植荚?個(gè)晶粒交隅處和兩個(gè)晶粒交界處，其晶體結(jié)構(gòu)均為面心立方（fcc），點(diǎn)陣常數(shù)a=0.559nm；富Nd相呈不同塊狀形貌，鑲嵌存基體內(nèi)或晶界上，其晶體結(jié)構(gòu)為密排六方（hcp），晶格常數(shù)a=0．395nm和c=0.628nm：在富O相中O，Nd和Fe的含量（原子分?jǐn)?shù)，下同）分別為45％～60％，20％～40％和10％～12％，塊狀富Nd相中則為80％～85％Nd和10％～l5％O，同時(shí)還發(fā)現(xiàn)晶界相中分布著少量的位錯(cuò)。

    Abstract:

    The microstructure of the explosively compacted Nd-Fe-B permanent magnets has been investigated by means of TEM and XRD. It is shown that there are three kinds of phases: matrix Nd2Fe14B, O-rich phases and Nd-rich phase with different structures and compositions in explosively compacted Nd-Fe-B permanent magnets. Matrix Nd2Fe14B is predominantly the hard Nd2Fe14B phase with lattice parameters of a=0.88 nm and c=1.22 nm. The O-rich phase presented at the two-grain boundaries and three-grain junctions, with fcc structures, and lattice parameter is a=0.559 nm. The O-rich phase belong to the compound Nd-Fe-O, and contents of O, Nd and Fe are 56at%, 22at% and 21at%, respectively. It is also shown that a large number of the block-shaped Nd-rich phases are in the two-grain boundary or three-grain junctions or Nd2Fe14B phases, with hcp structure and lattice parameters of a=0.395 nm and c=0.628 nm. The Nd-rich phases belong to compound Nd-O, and contents of Nd and O are 85at% and 12at%, respectively. Also a few dislocations in the boundary phases have been observed.

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敖琪 劉薇 吳建生.爆炸壓結(jié)Nd-Fe-B永磁體微觀結(jié)構(gòu)[J].稀有金屬材料與工程,2005,34(10):1613~1616.[Ao Qi, Liu Wei, Wu Jiansheng. Grain-Boundary Structure of Explosively Compacted Nd-Fe-B Magnets[J]. Rare Metal Materials and Engineering,2005,34(10):1613~1616.]
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  • 收稿日期:2004-06-07
  • 最后修改日期:2004-11-22
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