摘要
用超高温度梯度真空悬浮区熔定向凝固法制备了TbDyFe超磁致伸缩合金,研究了TbDyFe合金的晶体生长方式、轴向择优取向和磁致伸缩性能.结果表明:用悬浮区熔法可制备出轴向择优取向为<110>方向和<113>方向的TbDyFe合金;在20MPa的预应力和5l7.5kA·m-1的磁场下,取向为<110>和<113>的合金样品的磁致伸缩系数分别为l.8×10-3和1.6×10-3.随着生长速度的增大,TbDyFe合金由小晶面生长方式向非小晶面生长方式转变;使用取向为<110>或<113>的晶粒作籽晶,能加快晶粒的择优竞争生长,有利于<110>方向或<113>方向的轴向择优取向的形成;高温退火能不同程度地提高合金的磁致伸缩性能.
The float zone melting directional solidification device with super high temperature gradient has been used to prepare the TbDyFe magnetostrictive alloy and samples of <110> and <113> preferred orientations were obtained. The preferred orientation, microstructure and magnetostriction of TbDyFe alloy have been investigated. Under a 20MPa compressive stress, typical magnetostriction values of <110>-oriented and <113>-oriented grain-aligned rods are respectively 1.8×l0-3 and 1.6×l0-3 in 517.5 kA·m-1 applied field. Morphology changes with the increasing of the growth velocity from facet to nonfacet. Seed crystals can speed up competitive growth of crystals and promote <110> and <113> preferred orientations along axial direction. It has also been found that heat treatment can improve the magnetostriction in the TbDyFe alloy.TbDyFe magnetostrictive alloy, directional solidification, seed crystal
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2002年第3期307-312,共6页
Chinese Journal of Materials Research
基金
国家自然科学基金资助项目50071003.
