Fe取代对高锰锰铜合金组织和性能的影响

Effects of Fe substitution on the microstructure and properties of high magnese Mn-Cu alloys

用真空非自耗电弧炉熔炼、然后进行固溶处理制备了Mn80Cu20-xFex(x=0,2,4)合金。用X射线衍射分析、显微组织分析、差示扫描量热法、标准电阻应变计法等实验方法,研究了Fe取代对高锰Mn-Cu合金的组织和磁感生应变(magnetic-field-induced strain,MFIS)的影响。研究表明,Fe元素取代合金会发生γ→γ’转变,在Mn80Cu18Fe2和Mn80Cu16Fe4合金中还会有α相和ε相析出。随着Fe含量的增大,合金的磁性转变温度(Néel点)呈增高的趋势,且都高于室温,在室温下呈现反铁磁性;合金的最大磁感生应变也呈增大的趋势,Mn80Cu16Fe4合金获得的最大磁感生应变在0.9T时达到9×10-5。

MnsoCu20 xFex（x=0, 2, 4） alloys were prepared using non-consumble vacuum arc furnace smelting followed by subsequently solution treatment. The effect of Fe content on the microstructure and magnetic-field-induced strain（MFIS） was studied by means of X-ray diffraction （XRD）, photomicrograph, differential scanning calorimetry （DSC）, and resistance strain gauge method. The result showed that FCC→FCT martensitic transition occurs in Fe-substituted MnCu alloys, and α- and e-phase appeared in Mn80Cul8Fe2 alloy and MnsoCu16Fe4 alloy. With the increase of Fe content, the N6el temperatures of alloys increases, which are all higher than room temperature, that＇s to say, the alloys exhibit antiferromagnetic austenite microstructure at room temperature after quenching from high temperature. Alloys possess much larger magnetic-field-induced strain （MFIS） with the increase of Fe content, and taking Mn80Cul6Fe4 alloy as an example, when magnetic field strength was 0.9 T, the MFIS was at its maximum, 9× 10^-5.