Abstract
The strain gauge factor K at room temperature, the electrical resistivity ρ at 20°C, its mean temperature coefficient Cf and the mean thermo-electromotive force relative to copper Emf in the temperature range 0 to 40°C have been measured with the cylindrical wires of Fe-Co-Mn alloys in a cold worked state of about 94% reduction. It has been found that the maximum value of K is 5.4 in Fe-Mn binary alloy containing 30%Mn and decreases gradually with increasing Co content, the non-magnetic γ phase alloys showing the values of more than 4.0. ρ of Fe-Co binary alloys increases monotonously with the addition of Mn, while their Emf shifts from a negative to a positive value with increasing manganese content. Cf of Fe-Mn or Fe-Co binary alloys decreases with increasing Co or Mn content, respectively. Fe-30%Co-45%Mn alloy which exibits the minimum Cf of 2.4×10−4 show K of 4.6, ρ of 98 μΩ-cm and Emf of +0.2 μV/°C.
