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采用真空非自耗电弧炉熔炼,然后进行固溶处理制备了Mn70Fe30-xCox(x=0,2,4)试样.运用X射线衍射分析、显微组织分析、差示扫描量热法(DSC)、标准电阻应变计法等实验方法,研究了添加Co对Mn-Fe合金的磁诱发应变(magnetic-field-induced strain,MFIS)性能的影响.研究表明,Mn70Fe30-xCox(x=0,2,4)试样在室温下为单一的γ相组织.随着Co含量的增加,Mn70Fe30-xCox(x=0,2,4)试样的磁性转变温度TN(Neel点)呈降低的趋势,但都高于室温,在室温下呈现反铁磁性;Mn70Fe30-xCox(x=0,2,4)试样的最大磁诱发应变也呈增加的趋势.Mn70Fe26Co4试样的MFIS在1.1T时达到60ppm.
The Mn70Fe30-xCox (x = 0, 2, 4) samples were prepared by vacuum non-consumable electric arc furnace melting and then solution treatment.The microstructural analysis, differential scanning calorimetry DSC) and the standard resistance strain gauge method were used to study the effect of Co addition on the magnetic-field-induced strain (MFIS) performance of Mn-Fe alloys. The results show that Mn70Fe30-xCox 2,4) samples were single γ phase at room temperature.The magnetic transition temperature TN (Neel point) of Mn70Fe30-xCox (x = 0,2,4) samples tended to decrease with the increase of Co content , But both of them were higher than room temperature and exhibited antiferromagnetic properties at room temperature. The maximum magnetically induced strain of Mn70Fe30-xCox (x = 0, 2, 4) samples also showed an increasing tendency. MFIS of Mn70Fe26Co4 sample reached at 1.1T 60ppm.