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研究了γ-Fe-Mn-Al-Cr(Mnl8.6—25.6,A10—9.8,CrO—5.7at.-%)合金中磁化率x,弹性模量E及电阻率p与温度T的关系.实验结果揭示该合金中存在顺磁-反铁磁性转变.提高Mn含量将降低合金的x和升高反铁磁转变温度T_N.相反,随着Al含量的增加,x增大,T_点降低,X-T曲线在T_N点的峰值增高;T>T_N时,|dx/dT|增大.Cr对Fe-Mn合金x-T曲线的影响较小,T>T_N时,X几乎不因T而变化.合金中γ→ε马氏体转变引起X降低,反之,ε→γ转变导致x升高.以多元回归分析建立γ-Fe-Mn-Al-Cr合金中T_N点与成分的经验关系.在顺磁-反铁磁性转变温度附近伴有E及ρ的反常变化,呈现“电阻率极小”.现在对Fe-Mn-Al合金的ρ反常还难以作出确切的解释,负电阻温度系数的产生可能与形成反铁磁能隙有关.所得结果对发展Fe-Mn-Al-Cr系反铁磁Invar合金及超低温无磁钢有一定的参考价值.
The relationship between magnetic susceptibility x, elastic modulus E and resistivity p and temperature T in γ-Fe-Mn-Al-Cr (Mnl8.6-25.6, A10-9.8, CrO-5.7at .-%) alloys was investigated. The experimental results reveal that there is paramagnetic-antiferromagnetic transition in this alloy.Improve the content of Mn will reduce the alloy’s x and increase the antiferromagnetic transition temperature T_N.On the contrary, with the increase of Al content, x increases, T_ point decreases , The peak value of XT curve increases at T_N point, | dx / dT | increases when T> T_N.Cr has little effect on the xT curve of Fe-Mn alloy, and T hardly changes with T when T> T_N. In the γ → ε martensitic transformation, the X decreased, whereas ε → γ transformation led to the increase of x.Multiple regression analysis was used to establish the empirical relationship between T_N and γ-Fe-Mn-Al- - Anomalous changes in E and ρ accompanied by an antiferromagnetic transition temperature show an “extremely small resistivity.” Now it is difficult to explain precisely the ρ anomaly in Fe-Mn-Al alloys. The temperature coefficient of negative resistance may be related to Formation of anti-ferromagnetic energy gap.The results obtained for the development of Fe-Mn-Al-Cr antiferromagnetic Invar alloy and ultra-low temperature non-magnetic steel has some reference value.