Effect of Addition of Cobalt or Nickel on the Strain Gauge Factor and Electrical Properties of Iron-Chromium Alloys

Abstract

The present investigators already measured the strain gauge factor K and electrical properties for the wires of Fe-Cr alloys containing less than 50% chromium, and obtained the largest value of 6.2 in K for the alloy containing 20% chromium. So they have further investigated the influence of the addition of less than 70% cobalt or 65% nickel on their properties. Although K of Fe-Cr alloys shows some decrease with coefficient of electrical resistivity Cf and the mean thermo-electromotive force relative to copper Emf decrease and reach comparatively small values. The results on Fe-15%Cr-35%Co and Fe-10%Cr-20%Ni alloys show respectively.