摘要
根据作者对Fe-Mn基合金系相变与反铁磁转变的研究结果,提出一种反铁磁性r-Fe-Mn-Al-Cr新精密电阻合金的设计方法。研究了Al与Cr对r-Fe-Mn合金残余电阻率、反铁磁转变及伴随的电阻反常变化的影响,Al增加残余电阻率的作用为0.087/μΩ·m/at％,Cr为0.012μΩ·m/at％。当反铁磁有序散射电阻率的增加适能补偿声子散射电阻率的减少时,合金呈现很小的电阻温度系数。据此,在Fe-Mn基合金中由Mn、Al与Cr的优化组合,研制出具有较好综合性能的两种Fe-Mn-Al-Cr精密电阻合金,它们的工作温度范围、电阻率及温度系数大约分別为180～350K、1.00μΩ·m及-20～+20×10^(-6)K^(-1)。Fe-Mn-Al-Cr精密电阻合金的性能虽低于Karma合金,但前者的显著优点是其性能稳定,对热处理工艺不敏感。
Presents a process of designing antiferromagnetic γ-Fe-Mn-Al-Cr precision resistance alloys on the basic of an investigation on the antiferromagnetic transition and austenite region in Fe-Mn host alloys. Studies the effect of Al or Cr content on the residual resistance, Ne'el transition and anomalous changes of resistance in γ-Fe-Mn alloys. In the case of Fe-Mn-Al-Cr alloys, resiclual resistivity increases by approximately 8.7μΩ·cm and 1.2μΩ·cm for adding l at% Al and l at% Cr, respectively. The temperature coefficient (l/ρ) (dρ/dT) of alloys becomes a minimal value when the decrease in phonon scattering resistivity is compensated by the increase in antiferromagnetic ordered scattering resistivity. By the appropriate combination of Mn. Al and Cr content in γ-Fe-31%Mn host, two of antiferromagnetic γ-Fe-Mn-Al-Cr precision resistance alloys with desirable combination properties have been found. Their temperature range, resistivity and mean temperature cocfficient are about 180K to 350K, 1.0μΩ·m and -20K to+20×10^(-6)K^(-1), respectively. The resistive properties which are insensitive to heat treatment is a excellent character of γ-Fe-Mn-Al-Cr alloy although the resistive properties of γ-Fe-Mn-Al-Cr alloys are somewhat lower than that of karma alloy. Finally, the origin of antiferromagnetic ordered scattering resistance has been discussed in brief.
出处
《大连铁道学院学报》
1993年第4期77-83,共7页
Journal of Dalian Railway Institute
基金
国家自然科学基金:59171021
关键词
电阻合金
反铁磁转变
低电阻合金
precision resistance alloys
paramagnetic-antiferromagnetic transition
Fe-Mn-Al-Cr alloys
