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Giant magnetostriction of ferromagnetic shape memory alloys with the grain boundary controlled by rapidly solidified method

快速凝固晶界控制铁磁形状记忆合金的超磁致伸缩

基本信息

批准号：
13650709
负责人：
OKAZAKI Teiko
金额：
$ 1.92万
依托单位：
Hirosaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650709/
关键词：
rapidly solidified method giant magnetostriction Fe-29.6at%Pd Fe-15〜17at%Ga Co_2NiGa [100] texture sensor actuator shape memory alloy 超磁歪合金 Acoustic Elastometer 磁性形状記憶合金液体急冷凝固法 Fe-Ga 微細柱状組織 Fe-Pd合金薄帯 (100)集合組織

项目摘要

The propose of this study as the developments of multi-functional sensor/actuator material, whish is useful as complex, small robots and micro-machines. Ferromagnetic shape memory alloys(FSMA), in which giant strain is caused by re-arrangements of the martensitic variants by applying magnetic field, are new type of actuator material rapidly responded to magnetic field, while, thermo-elastic shape memory alloys respond to heat slowly. In order to obtain the FMSA with good controlled texture, a rapidly solidified method was applied to Fe-Pd,Fe-Pt,Heusler-type Co_2NiGa and Fe-Ga alloys.1)Fe-29.6at%Pd,Fe-23at%Pt alloys : Although a single crystal and bulk samples have martensite phase only under room temperature, rapidly solidified ribbons exhibit giant magnetostnction of 1800(Fe-29.6at%Pd) and 420(Fe-23at%Pt> at〜373 K. The origin is due to that the ribbons are caused by strongly [100] oriented columnar microstructure with the size of grain, 1〜3μm. Especially, the grains of about 1μm size consist of fine layer-structure of 30-40nm thickness. These nano-scale layers are parallel to the columnar structure, which is stress-induced martensite twin. The nano-scale martensite twins make phase-transformation temperature increase to〜373 K.2)Co_2NiGa alloy : Heusler-type Co_2NiGa as well as Ni_2MnGa, which exhibits giant magnetostnction at low temperature, is rapidly solidified in order to develop a FSMA. The ribbon sample exhibits large magnetostnction and good shape recovery at temperature range of 350〜400K.3)Fe-17at%Ga alloy : a single crystal with large magnetostriction of 300ppm is much bnttle. The rapidly solidified ribbon has ductility and exhibits large magnetostnction of 200ppm.

本研究为多功能传感器/执行器材料的发展提供了参考，可用于复杂的小型机器人和微型机械。铁磁形状记忆合金（FSMA）是一种对磁场响应迅速的新型致动材料，而热弹性形状记忆合金对热响应缓慢。为了获得织构控制良好的FMSA，对Fe-Pd、Fe-Pt、heusler型Co_2NiGa和Fe-Ga合金采用了快速凝固的方法。1)Fe-29.6at%Pd、Fe-23at%Pt合金：虽然单晶和块状样品在室温下仅具有马氏体相，但在~ 373 K下，快速凝固的带状表现出1800（Fe-29.6at%Pd）和420（Fe-23at%Pt>）的巨磁阻。这是由于带状是由晶粒尺寸为1 ~ 3μm的强[100]取向柱状组织形成的。特别是1μm左右的晶粒由30 ~ 40nm厚度的精细层状结构组成。这些纳米层平行于柱状结构，为应力诱导马氏体孪晶。纳米马氏体孪晶使相变温度升高至~ 373 K.2)Co_2NiGa合金，heusler型Co_2NiGa和低温下表现出巨磁阻的Ni_2MnGa迅速凝固形成FSMA。在350 ~ 400k的温度范围内，带状样品表现出较大的磁致伸缩和良好的形状恢复。3)Fe-17at%Ga合金的单晶具有300ppm的大磁致伸缩。快速凝固的带状具有延展性，并表现出200ppm的大磁阻。