Abstract
The methods of Mossbauer spectroscopy and dilatometry are used to study the local atomic structure and thermal expansion of amorphous invar alloy Fe83B17. It is assumed that the alloy contains regions in which the local order corresponds to metastable orthorhombic and tetragonal phases of the composition Fe3B. The quantitative ratio of these regions is determined from Mossbauer spectra and is found to be 1:3. A quantitative two-level model of volumetric striction is presented. It is proposed in the model that heating is accompanied by reversible relaxation of orthorhombic configurations of the Fe3B type to tetragonal configurations, which in turn shortens the distance between iron atoms.
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