摘要
制备了具有择优取向的粘结Ni52Mn24.4Ga23.6磁体,测量了其在不同温度下的磁诱发应变,并就测试温度对磁诱发应变的影响进行了探讨。结果表明:粘结磁体室温时在1.2T磁场下磁诱发应变能达到饱和,为150×10-6的伸长应变;零摄氏度时磁体则在0.6T的磁场下产生76×10-6的饱和收缩应变;零摄氏度时磁诱发应变的可逆性要明显好于室温时应变的可逆性。XRD分析表明,造成不同测试温度下粘结磁体磁诱发应变行为不同的原因可能是不同温度下合金晶体结构有所不同。
Bonded Ni_(52)Mn_(24.4)Ga_(23.6) magnets were compacted with a magnetic field in which a preferential orientation of the martensitic variants was established. The magnetic-induced strains (MFIS) of bonded magnet were observed at room temperature and 0℃, and the effect of temperature on the MFIS was studied. It was found that applying a field of about 1.2T, the MFIS observed at room temperature saturated with an expanse of 150×10^(-6); while at 0℃,the MFIS reached saturation at about 0.6T with a shrink of 76×10^(-6). At the same time, the reversibility of MFIS observed at 0℃ was better than that of MFIS observed at room temperature. The XRD results showed that these characteristics of MFIS could be attributed to the difference of the crystal structure of the bonded Ni_(52)Mn_(24.4)Ga_(23.6) magnet at different temperature.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2005年第7期23-27,共5页
Journal of Materials Engineering
基金
湖南省自然科学基金资助项目(02JJY2082)
