Landolt-Börnstein - Group III Condensed Matter Introduction


This chapter presents a brief introduction to the discussion on the properties of Elinvar alloys. Elinvar characteristics refer to the temperature independence of Young’s modulus E and shear modulus G near room temperature. Elinvar alloys are used in the areas of precision instruments, controlling devices and electromagnetic instruments. Elastic properties of alloys are affected by several kinds of factors. Especially, magnetic materials show a ΔE and ΔG effect below the magnetic transition temperature. The Elinvar characteristics are observed when the usual temperature dependences of Young’s modulus and shear modulus are comparable in magnitude with these magnetic effects. The elastic constant and also its temperature dependence show a crystalline anisotropy. Elinvar characteristics are obtained by aligning crystal orientations in polycrystals. Internal strains also affect elastic properties and Elinvar characteristics are often observed in quenched or rolled alloys even in the paramagnetic state. Magnetic energies are associated with an applied stress and also with the internal strains. As a consequence Young’s modulus in the demagnetized state is different from that in the magnetized state.

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Title Introduction
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Magnetic Alloys for Technical Applications. Soft Magnetic Alloys, Invar and Elinvar Alloys
7.1.5 Elinvar alloys
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Landolt-Börnstein - Group III Condensed Matter
  • H. P. J. Wijn
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  • K. Fukamichi
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