【摘要】 研究了Tb0.3Dy0.7(Fe,M)1.95(M=Mn,Al,B,Ti,x=0.03)合金在高温度梯度区熔定向凝固过程中，晶体轴向取向、结晶形貌随晶体生长速度的变化规律和不同晶体轴向取向与磁致伸缩应变之间的关系．结果发现，晶体生长速度由低变高时，晶体由平面晶向胞状晶、胞技晶、树枝晶生长转化．晶体也相应地由利＜110＞，＜112＞变化为＜110＞＋＜113＞＋＜112＞混合轴向取向．完全的＜112＞轴向取向可获得优异的磁致伸缩性能．更多还原

【Abstract】 The crystallographic orientation, morphologies and the relationship betweenthe orientation and magnetostrictive properties of directionally solidified Laves-phaseeTb0.3Dy0.7 (Fe,M )1.95 alloys by zone melting with high thermal gradient GL wre studied.With increasing in Laves-phase growth vilocity at a high GL given, it is shown that thesolidification structure of alloys are from planar to cellular and to final dentritic structure,and meanwhile the crystallographic orientation of the Laves-phase are various correspondent-ly. The optimum magnetostrictive properties of the alloys with perfect <112> axial orienta-tion are obtained.更多还原