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Invar and Elinvar Alloys

The term invar alloys is used for some groups of alloys characterized by having temperature-invariant properties, either temperature-independent volume (invar) or temperature-independent elastic properties (elinvar) in a limited temperature range. A comprehensive survey of the physics and applications of invar alloys is given in [3.17]. [Pg.780]

With the discovery of an Fe-36wt%Ni alloy with an uncommonly low thermal expansion coefficient (TEC) around room temperature and called Invar by Guil- [Pg.780]

The linear (ct) and volumetric (/3) thermal expansion coefficients (TECs) are defined as  [Pg.781]

The thermal expansion of invar alloys is affected significantly by the addition of third elements. [Pg.782]

Invar is an austenitic aUoy and cannot be hardened by heat treatment. The effect of heat treatment on the TEC a depends on the method of cooling after annealing. Air cooling or water quenching from the annealing temperature results in a reduction of a but at the same time a becomes unstable. In order to stabilize the material, annealing at low temperature and slow cooling to room temperature are necessary. [Pg.782]


Asa decisive variable determining the properties of invar and elinvar alloys (Sect. 4.3.2.8). [Pg.757]

Kik3] Kikuchi, M., Fukamichi, K., Masumoto, T., Invar- and Elinvar-Type Amorphous Fe-Cr-B Alloys with High Corrosion Resistance , Set Rep. Res. Inst Tohoku Univ. Ser. A - Phys. Chem. Metall, 27(2), 210-219 (1979) (Experiment, Magn. Prop., Meehan. Prop., 23)... [Pg.440]

The iron meteorites are mostly composed of the Fe-Ni alloy minerals kamacite, taenite, and tetrataenite, and are believed to be remnants of the cores of parent bodies. Grains of Fe-Ni alloys are also common in most other types of meteorites. Because of exceedingly low cooling rates from the melt (typically 1 K/Ma), the recovered materials are believed to be close to equilibrium structures and are therefore of interest to metallurgists, especially given the importance of industrial Fe-Ni alloys such as Invar (FeesNiss), Elinvar, and Permalloy. [Pg.276]


See other pages where Invar and Elinvar Alloys is mentioned: [Pg.755]    [Pg.780]    [Pg.755]    [Pg.780]    [Pg.755]    [Pg.780]    [Pg.755]    [Pg.780]    [Pg.145]    [Pg.781]    [Pg.781]   


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Invar

Invar alloys

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