大磁致伸缩铁镓合金的模量软化与马氏体相变

Modulus Softening and Martensitic Transformation in Large Magnetostrictive Fe-Ga Alloys

Fe-Ga合金因其低场大磁致伸缩性能和良好的力学性能,在传感器、换能器和精密加工等高技术领域具有重要应用前景,自2000年以来成为磁致伸缩材料研究的热点。尽管目前人们对非磁性Ga元素固溶于α-Fe显著提升磁致伸缩性能的微结构根源没有形成统一认识,但大量的研究表明Fe-Ga合金的大磁致伸缩与模量软化行为密切相关。鉴于模量软化是马氏体相变的重要特征,有学者推测Fe-Ga合金可能也蕴含马氏体相变现象。主要概述了Fe_(100-x)Ga_x(x=21~27,原子百分数)合金的模量软化现象、马氏体相变行为、马氏体相变与磁致伸缩性能的关联性等研究进展,以加深对Fe-Ga合金大磁致伸缩微结构根源的理解。

Fe-Ga alloys have important application prospects in high-tech fields,such as sensors,transducers and actuators due to their large magnetostriction under low saturation magnetic field and good mechanical properties.Although the microstructure mechanisms are still controversial for the extraordinary magnetostriction enhancement induced by nonmagnetic Ga solution into body-centered-cubic Fe,considerable experiments have indicated that the large magnetostriction of Fe-Ga alloys is closely related to the modulus softening behavior.Considering that modulus softening is a common feature of martensitic transformation in ferroelastics,researchers then suggested that Fe-Ga alloys may also have martensitic transformation phenomena.In order to deepen the understanding of large magnetostriction in Fe-Ga alloys,here we present a brief review on the modulus softening,martensitic transformation behavior as well as the correlation between martensitic transformation and magnetostriction of Fe-Ga alloys with Ga content between 21at.%and 27at.%.