粉末烧结法制备Al/Tb_(0.3)Dy_(0.7)Fe_(1.95)磁致伸缩复合材料

Preparation of Al/Tb_(0.3)Dy_(0.7)Fe_(1.95) Magnetostrictive Composites by Powder Sintering Process

采用粉末烧结法制备了Al/Tb0.3Dy0.7Fe1.95磁致伸缩复合材料,研究了烧结温度对烧结体的显微结构、相组成、磁致伸缩、抗压强度等性能的影响。研究结果表明,600℃烧结时,烧结体中仍主要存在Al与GMM合金相,烧结获得较理想的相分布状态。随着烧结温度的增加,复合体中非GMM相越来越多,原始相减少。当1200℃烧结时,烧结体中主要存在杂相,已几乎没有GMM相。随着烧结温度的增加,复合材料的λs和抗压强度明显下降,烧结温度为600℃时,烧结体的λs和抗压强度最大,分别为405×10-6和61.71MPa。其不足是,复合材料仍呈现明显的脆性特征。

Using powder sintering process, A1/Tb0.3 Dy0.7 Fe1.95 composites were prepared. Dependence of sintering temperature on the microstructure, phases, magnetostriction and mechanical property of composites were investigated. The results show that there mainly are ReFe2 and Al phases in the composites sintered at 600 ℃. The sintered body has good microstructure. And ReFe2 phases reduce accordingly with the increasing of sintering temperature. There are mainly different impurity phases in the composites sintered at 1200℃. With the increasing of sintering temperature, magnetostriction and compressive strength of composites decrease evidently. When the sintering temperature is at 600 ℃ , the magnetostriction and the compressive strength of the composites are 405 × 10 ^-6 and 61.71 MPa, respectively. But it is a pity that the Al/Tb0.3Dy0.7Fe1.95 composites are still fragile.