On the Thermal Expansion, Rigidity Modulus and Its Temperature Coefficient of the Alloys of Cobalt, Iron and Vanadium and a New Alloy "Velinvar"

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According to the rule on the small expansibility of invar, previously proposed by one of the present investigators, they expected that there are invar and elinvar type alloys in the system of cobalt, iron and vanadium. So, they measured the thermal expansion of the alloys containing 50 to 80 percent of cobalt and less than 13 percent of vanadium and found that an addition of vanadium to cobalt-iron alloys considerably reduces their expansibility. The least coefficient of linear expansion in the temperature range of 10° to 50° was 3.94×10^<-6> in the alloy containing 56 percent of cobalt and 9 percent of vanadium. They also measured the mean temperature coefficient of rigidity modulus of the alloys in the temperature range of 20° to 50° by a torsion pendulum method and found that the coefficients of most alloys are negative, while as the concentration approaches the composition, at which the thermal expansion coefficient was least, the coefficient diminishes. first gradually and then rapidly, becomes zero at a certain composition and afterwards changes its sign. Then the coefficient reaches a positive maximum (+31.5×10^<-5>) in the alloy showing a least expansion coefficient. Thus, it will be seen that there are many elinvar type alloys in this ternary system. Further, the rigidity modulus at 20° of the alloys was also determined with the result that the modulus shows a maximum value (8.46×10^5 Kg/cm^2) at the composition containing 55 percent of cobalt and 13 percent of vanadium and a minimum (5.40×10^5 Kg/cm^2) at that containing 63 percent of cobalt and 7 percent of vanadium.
東北大学の論文

On the Thermal Expansion, Rigidity Modulus and Its Temperature Coefficient of the Alloys of Cobalt, Iron and Vanadium and a New Alloy "Velinvar"

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