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采用环氧树脂粘结Sm0.88Nd0.12Fe1.93合金颗粒,在外磁场中固化成型制备了磁致伸缩复合材料,研究了不同磁场中成型复合材料的显微组织、磁致伸缩和电阻率。结果表明,成型磁场为0T时,复合体系为0-3型构型,合金颗粒在树脂基体中无序分布;施加0.6T的固化磁场,获得伪1-3型构型复合材料,合金颗粒趋近定向排列。Sm0.88Nd0.12Fe1.93合金颗粒体积分数为30%、固化磁场为0.6T时,制备的复合材料在1.3T磁场下的磁致伸缩系数(λ∥–λ⊥)可达–1088×10-6,为铸态合金磁致伸缩系数的86.6%。相同颗粒体积分数的粘结Sm0.88Nd0.12Fe1.93复合材料,固化磁场为0.6T较无固化磁场条件下的电阻率降低85%。
The Sm0.88Nd0.12Fe1.93 alloy was bonded by epoxy resin, and the magnetostrictive composite was prepared by curing in the external magnetic field. The microstructure, magnetostriction and resistivity of the composites were studied. The results show that when the forming magnetic field is 0T, the composite system is of 0-3 type configuration and the alloy particles are disordered in the resin matrix. The solidified magnetic field of 0.6T is applied to obtain pseudo-1-3 configuration composite material. Near orientation. Sm0.88Nd0.12Fe1.93 alloy particles volume fraction of 30%, the curing magnetic field of 0.6T, the magnetostriction coefficient (λ∥-λ⊥) of the composite prepared under a magnetic field of 1.3T up to -1088 × 10- 6, 86.6% of the magnetostrictive coefficient of the as-cast alloy. The same particle volume fraction of bonded Sm0.88Nd0.12Fe1.93 composites, the curing magnetic field is 0.6T lower than the non-curing magnetic field resistivity decreased by 85%.