《110》和《112》取向Tb-Dy-Fe超磁致伸缩合金的定向生长

• 作 者: 蒋成保 赵岩 徐惠彬
• 机 构: 北京航空航天大学材料学院,北京航空航天大学材料学院,北京航空航天大学材料学院 北京 100083,北京 100083,北京 100083
• 出 处: 金属学报
• 发表日期: 2004年04期

采用区熔定向凝固方法,在30-720 mm/h生长速度范围内,均能获得(110)轴向择优取向生长的Tb-Dy-Fe合金;凝固形态随生长速度提高出现从平面晶到胞状晶、树枝晶转变;低速生长(30 mm/h)的样品磁致伸缩性能没有压力效应,高速生长(≥120 mm/h)的样品磁致伸缩性能具有明显的压力效应.低生长速度时〈110〉取向样品按双{111}系孪晶生长,高生长速度时按单{111}系孪晶生长,由此计算样品的磁致伸缩性能与实验结果基本吻合.在更高生长速度下(900 mm/h)获得沿〈112〉轴向高度择优取向的样品,其磁致伸缩性能与高生长速度〈110〉取向样品性能相当,具有明显的压力效应.

In the range of 30-720 mm / h growth rate, (110) Tb-Dy-Fe alloy with axial preferred orientation was obtained by zone melt directional solidification method. The solidification morphology changed from plane crystal to cellular Crystal and dendritic transformation. There is no pressure effect on the magnetostriction of the sample grown at low speed (30 mm / h), but the magnetostriction of the sample grown at high speed (≥120 mm / h) has obvious pressure effect. 110> oriented samples were grown by twins {111} twins and grown as single {111} twins at high growth rates. The magnetostriction of the samples was basically consistent with the experimental results. At higher growth rates 900 mm / h), the samples with the preferred orientation in the <112> axial direction have the same magnetostrictive performance as the high growth rate <110> oriented samples with obvious pressure effect.