Effect of Aging on the Stability of Thermoelastic Properties
of Elinvar

V. R. Baraz, E. L. Zakharova, and V. A. Strizhak

Ural State Technical University, ul. Mira 19, Ekaterinburg, 620002 Russia

Received January 8, 1997; in final form, June 13, 1997

Abstract—Quenched elinvar alloy 45NKhT has a decreased Young’s modulus, which may be restored by
aging, bringing the alloy to a more equilibrium state. The anomalous deviation of Young’s modulus from the
equilibrium value may be divided into the magnetoelastic and structural components, which originate from fer-
romagnetic ordering and structural instability, respectively. The thermoelastic coefficient of the alloy is char-
acterized by a substantial aging-temperature dependence, which allows one to control the degree of elinvar
anomaly manifested by the alloy.

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