The Thermal Expansion Coefficients and the Temperature Coefficients of Young's Modulus of the Alloys of Iron and Palladium

概要

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The density ρ, Young's modulus E, the coefficient of linear thermal expansion α, and the temperature coefficient of Young's modulus e were measured with alloys of iron and palladium cooled down in a furnace after heating at 1000℃to ascertain whether a theory of Invar established previously by one of the present investigators is valid in the above alloy system or not. It was found that the both curves of ρ and of E to the alloying concentration showed a slight bend at the composition of about 30 at% of palladium, and also α showed its minimum value of +8.9×10^<-6> and e its conspicuous positive maximum of +139.9×10^<-5> at 30 at% of palladium. The alloy containing 30 at% of palladium consists almost of the γ phase after furnace cooling, but when it was cooled slower than 30°/hr from 800℃, the γ phase decreased reaching zero at the rate of 5°/hr, accompanying an increase of α to +12.3×10^<-6>, and a decrease of e to -12.5×10^<-5>, both in the order of usual alloys. According to these results, it can be confirmed that the theory of Invar mentioned above is also valid in the iron and palladium system under all conditions.
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