CAJ | 학술논문

通过示差扫描量热仪和振动样品磁强计对Ni_(43)Mn_(46-x)T_xSn_(11)(T=Fe,Co,Ni)铁磁形状记忆合金的相变、磁性以及磁熵变进行了研究.结果表明,由于价电子浓度的增加,Fe,Co,Ni替代Mn使马氏体转变温度大幅提高.Fe,Ni掺杂对马氏体居里温度(Tc_M)影响不大,Co则使T_c~M略有下降;奥氏体居里温度(T_c~A)对成分比较敏感,Fe,Ni的加入均使T_c~A略有提高,而Co则会大大提高T_c~A.由于马氏体相变伴随着磁化强度的突变,Ni_(43)Mn_(46-x)T_xSn_(11)合金在马氏体相变附近具有较大的低场磁熵变,对于Ni_(43)Mn_(41)Co_5Sn_(11)在室温1 T磁场下磁熵变达到了19 J·kg~(-1)·K~(-1).通过调节成分,磁熵变峰值温度可以在199和294 K之间调节,同时保持了较大低场磁熵变.
통과시차소묘량열의화진동양품자강계대Ni_(43)Mn_(46-x)T_xSn_(11)(T=Fe,Co,Ni)철자형상기억합금적상변、자성이급자적변진행료연구.결과표명,유우개전자농도적증가,Fe,Co,Ni체대Mn사마씨체전변온도대폭제고.Fe,Ni참잡대마씨체거리온도(Tc_M)영향불대,Co칙사T_c~M략유하강;오씨체거리온도(T_c~A)대성분비교민감,Fe,Ni적가입균사T_c~A략유제고,이Co칙회대대제고T_c~A.유우마씨체상변반수착자화강도적돌변,Ni_(43)Mn_(46-x)T_xSn_(11)합금재마씨체상변부근구유교대적저장자적변,대우Ni_(43)Mn_(41)Co_5Sn_(11)재실온1 T자장하자적변체도료19 J·kg~(-1)·K~(-1).통과조절성분,자적변봉치온도가이재199화294 K지간조절,동시보지료교대저장자적변.
The phase transitions,magnetic properties,and magnetic entropy changes in Ni_(43)Mn_(46-x)T_xSn_(11)(T=Fe,Co,Ni)ferromagnetic shape memory alloys were studied by using differential scanning calorimeter and vibrating sample magnetometer.The martensitic transformation temperature increased rapidly with the substitution of Mn by Fe,Co,and Ni,which could be attributed to the increase of valence electron concentration.The Curie temperature of martensitie phase showed little dependence on the composition,while the curie temperature of austenitic phase(T_C~A)was sensitive to composition.Fe and Ni doping led a small increase of T_C~A,and the substitution of Mn by Co largely raised T_C~A.Large positive magnetic entropy changes were observed due to the large magnetization change around the martensitic transformation temperatures. Especially, in Ni_(43)Mn_(41) Co_5Sn_(11), the magnetic entropy change reached 19 J·kg~(-1)·K~(-1) in the field of 1 T at 294 K.By tuning the composition,the working temperature could be adjusted between 199 and 294 K with large magnetic entropy changes.