Thermal Expansion Coefficient, Rigidity Modulus and Its Temperature Coefficient of the Alloys of Iron, Nickel, Cobalt and Chromium, and Relations of Super Invar to Stainless Invar and of Elinvar to Co-Elinvar

概要

論文の詳細を見る
The influence of an addition of chromium on the thermal expansion, rigidity modulus and its temperature coefficient of the alloys of iron, nickel and cobalt has been determined. It has been found that, in the relations of the thermal expansion cofficient or the temperature coefficient of rigidity modulus to the concentration of the alloys of iron, nickel, cobalt and chromium, there are two ranges of the minimum values of the expansion coefficient or the maximum values of the positive temperature coefficient of the modulus, one of which originates at the composition of invar, that is, in the neighbourhood of the composition of super invar, or elinvar in the binary system of iron and nickel, and the other at those of stainless invar or co-elinvar in the ternary system of iron, cobalt and chromium ; they come together at the section of 10 per cent of chromium of the quaternary system, showing that stainless invar or co-elinvar are closely connected respectively with invar (super invar) or elinvar, and also that the nickel and the cobalt contained in each alloy can be substituted almost linearly by each other.
東北大学の論文