THE STRESS-STRAIN-RESISTANCE RELATIONS IN Fe-Mn-Si ALLOYS

1. IntroductionThe strain sensitivity coefficients of resistance, K, have a value of about 2.0 in elasticregion for most alloys, such as constantan (a Cu-Ni alloy), karma (a Ni--Cr based alloy)and Fe-Cr-Al alloy, except Pt-W alloys. The K values are also about 2.0 in plastic regionfor the most alloys. For the ac--Fe--Mn-Al-Cr alloy it is also about 2.0 during plastic transformation, however, it becomes as high as 4.0--4.8 due to the antiferromagnetic transitionbelow the N6el temperature,…