Achieving ultrastrong anisotropy in bulk Pr2Fe14B/α-Fe nanocomposite magnets by high-pressure thermal compression
Achieving ultrastrong anisotropy in bulk Pr2Fe14B/α-Fe nanocomposite magnets by high-pressure thermal compression
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DOI：
10.1080/02670836.2022.2065048
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发表时间：
2022-04
影响因子：
1.8
通讯作者：
Guosheng Zhang;Xiaohong Li;Fuchen Hou;Li Lou;Ming Li;D. Guo
中科院分区：
文献类型：
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作者：
Guosheng Zhang;Xiaohong Li;Fuchen Hou;Li Lou;Ming Li;D. Guo
由于体块纳米复合磁体的软相分数较高，硬相的对准一直是制造体块纳米复合磁体的一大挑战。以非晶态前驱体为原料，采用高压热压缩变形法制备了各向异性块体Pr2Fe14B/α-Fe纳米复合磁体。合成的磁体具有超强的磁各向异性，具有高达29 wt.%的高软相分数和由等轴和板条状晶粒组成的双形态晶粒结构。这种各向异性是由于Pr2Fe14B纳米晶在高应力大应变变形过程中优先形核和生长而形成的强（00l）晶体织构所致。该研究有利于在高软相分数的前提下，开发具有优异能量产物的块状纳米复合磁体。
Aligning the hard phase has always been a great challenge in fabricating bulk nanocomposite magnets due to the high soft-phase fractions. In this work, anisotropic bulk Pr2Fe14B/α-Fe nanocomposite magnets have been fabricated from amorphous precursors by high-pressure thermal compression deformation. The synthesised magnet exhibits an ultrastrong magnetic anisotropy with a high soft-phase fraction of ∼29 wt.% and a dual-morphology grain structure that consists of equiaxed and lath-shaped grains. The anisotropy is originated from the strong (00l) crystallographic texture for Pr2Fe14B nanocrystals on account of its preferential nucleation and growth during the deformation with high stress and large strain. This study is favourable for the development of bulk nanocomposite magnets with superior energy products on the premise of high soft-phase fractions.