CAJ | 학술논문

通过研究铁磁性金属间化合物Ni2+xMn1-xGa(x=-0.1,0,0.08,0.13,0.18,0.2)和Ni2-xMn1+x/2Ga1+x/2(x=-0.1,0,0.04,0.06,0.1)两个系列多晶样品的交流磁化率随温度的变化行为，得到了化合物在不同组分下的马氏体相变温度TM和居里温度TC.发现随着Ni成分的增加，前者的马氏体相变温度Tm增加，而居里温度TC降低，后者的马氏体相变温度Tm和居里温度TC均是先增大后减小.报道了Tm在室温附近的单晶样品Ni52Mn24Ga24的磁场增强双向形状记忆效应.发现伴随着马氏体相变，样品在［001］方向可产生1.2%的收缩.如果在该方向施加1.2T的偏磁场可以使该应变值增大到4.0%.而垂直于［001］方向施加1.2T的偏磁场时，在［001］方向产生1.6%的膨胀.阐明了产生大应变的原因并非相界移动，而是单晶的杂散内应力小和外加磁场通过孪晶界移动使马氏体变体重组的共同结果.
통과연구철자성금속간화합물Ni2+xMn1-xGa(x=-0.1,0,0.08,0.13,0.18,0.2)화Ni2-xMn1+x/2Ga1+x/2(x=-0.1,0,0.04,0.06,0.1)량개계렬다정양품적교류자화솔수온도적변화행위，득도료화합물재불동조분하적마씨체상변온도TM화거리온도TC.발현수착Ni성분적증가，전자적마씨체상변온도Tm증가，이거리온도TC강저，후자적마씨체상변온도Tm화거리온도TC균시선증대후감소.보도료Tm재실온부근적단정양품Ni52Mn24Ga24적자장증강쌍향형상기억효응.발현반수착마씨체상변，양품재［001］방향가산생1.2%적수축.여과재해방향시가1.2T적편자장가이사해응변치증대도4.0%.이수직우［001］방향시가1.2T적편자장시，재［001］방향산생1.6%적팽창.천명료산생대응변적원인병비상계이동，이시단정적잡산내응력소화외가자장통과련정계이동사마씨체변체중조적공동결과.
The martensitic phase transformation temperature,Tm and the Curie temperature, TC, of polycrystalline samples Ni2+xMn1-xGa(x=-0.1,0,0.08,0.13,0.18,0.2) and Ni2-xMn1+x/2Ga1+x/2(x=-0.1,0,0.04,0.06,0.1) have been investigated by measuring the temperature dependence of alternating-current susceptibility. It was found that, with the increase of Ni content, TC decreases and Tm increases for Ni2+xMn1-xGa, and both TC and Tm increase first and decrease afterwards for Ni2-xMn1+x/2Ga1+x/2. Stress-free and two-way thermoelastic shape memory, with 1.2% strain, has been found in single crystal Ni52Mn24Ga24. The deformation can be enhanced more than three times, up to 4.0% shrinkage with a bias field 1.2T applied along the measurement direction. The origin of large recoverable strain should be attributed to the low level of internal stress and the field-induced rearrangement of martensitic variants through twin boundary motion rather than the phase boundary motion.