Abstract
This paper presents the result of research of thermomechanical treatment impact on polycrystalline tungsten structure and properties. Samples were exposed to deformation. Two deformation technics were applied: uniaxial rolling and cross direction rolling. After deformation all samples acquired the form of foil. After deformation the relation between the structure of the foils and the annealing time was investigated.The investigation of high-temperature deformation was conducted using the samples which underwent preliminary heat treatment, and which didn't. The result of heat treatment and tensile strength investigation of pre-machined polycrystalline tungsten samples at elevated temperature is presented in this study. It is shown that annealing at 2670 K after uniaxial rolling could result in significant increase of high temperature creep resistance of tungsten.The factors that determine the effect of reducing high-temperature deformation of modified tungsten have been identified. As a result of mechanical treatment with subsequent annealing a unique nanoscale structure is formed. The tungsten nanocomposite has been obtained for the first time. During investigation of tungsten nanocomposite thermal stability its structural stability has been confirmed.
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