Influence of Addition of Nickel on the Thermal Expansion, Rigidity Modulus and Its Temperature Coefficient of the Alloys of Cobalt, Iron and Chromium, Especially of Co-elinvar. I : Additions of 10 and 20 per cent of Nickel

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The influence of additions of 10 and 20 per cent of nickel on the thermal expansion in the range from 10 to 50°, rigidity modulus at 20°and its temperature coefficient in the range from 20 to 50°of the alloys of cobalt, iron and chromium was studied. The relations between those properties and the concentrations of nickel-added alloys were almost similar qualitatively to those in the case of the ternary alloys of cobalt, iron and chromium, that is, there were two groups of alloys, one showing a positive temperature coefficient of rigidity modulus and the other a negative. In the case of addition of 10 per cent of nickel, the smallest thermal expansion coefficient was 2.20×10^<-6>, while in the case of addition of 20 per cent, it was 1.69×10^<-6>. The largest positive values of the temperature coefficients of rigidity modulus in the corresponding cases were respectively+46.7×10^<-5> and + 66.0×10^<-5>. The largest and smallest values of rigidity modulus in the case of addition of 10 per cent of nickel were 9.10×10^5 kg/cm^2 and 6.00×10^5 kg/cm^2, and in the case of 20 per cent of nickel they were respectively 8.36×10^5kg/cm^2 and 5.09×10^5kg/cm^2.
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