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采用区熔定向凝固方法制备了<110>轴向择优取向的Tb0.3Dy0.7Fe2超磁致伸缩合金,在真空管式炉氩气保护条件下,对合金进行不同温度和时间的热处理,研究了不同处理时间、处理温度、冷却条件对该合金取向、组织、磁致伸缩性能以及力学性能的影响。结果表明:热处理不改变定向凝固形成的轴向择优取向;经930℃×2 h热处理后,网状的富稀土相基本转变为球状并均匀分布在基体相内,定向凝固形成的片层状组织发生退化,减小了REFe2相的磁畴在磁场中转动的阻力。细小的球状富稀土相均匀弥散分布在基体相内,减少了应力集中,因此提高了磁致伸缩性能和压缩强度;定向凝固Tb-Dy-Fe合金采用930℃×2h热处理后随炉冷却的工艺可以获得良好的综合性能,其饱和磁致伸缩为1226×10-6,压缩强度为256 MPa。
The Tb0.3Dy0.7Fe2 giant magnetostrictive alloy with <110> axial preferred orientation was prepared by zone melting directional solidification method. The alloys were treated with different temperature and time under the protection of argon in a vacuum tube furnace. Treatment time, treatment temperature and cooling conditions on the orientation, microstructure, magnetostrictive properties and mechanical properties of the alloy. The results show that: the heat treatment does not change the orientation of the directional solidification of the axial preferred orientation; after 930 ℃ × 2 h heat treatment, the mesh-rich rare earth phase basically transformed into spherical and uniformly distributed in the matrix phase, the directional solidification of the lamellar structure Degradation occurs, reducing the resistance of the REFe2 phase’s magnetic domains rotating in the magnetic field. Fine spherical rare earth rich phase uniformly dispersed in the matrix phase, reducing stress concentration, thereby enhancing the magnetostrictive performance and compressive strength; directional solidification Tb-Dy-Fe alloy after 930 ℃ × 2h heat treatment with the furnace cooling process Can get a good overall performance, the saturation magnetostriction of 1226 × 10-6, compressive strength of 256 MPa.