Microstructure of severely deformed metals determined by X-ray peak profile analysis

Gubicza, Jenő and Nam, N. H. and Balogh, L. and Hellmig, R. J. and Stolyarov, V. V. and Estrin, Y. and Ungár, Tamás (2004) Microstructure of severely deformed metals determined by X-ray peak profile analysis. In: 9th International Symposium on Physics of Materials, 2003. szeptember 1-4., Prága, Csehország.

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Abstract

Two essentially different metals, fcc copper and hexagonal titanium, were deformed by equal channel angular pressing (ECAP) up to eight passes. The microstructure developed as a result of severe plastic deformation (SPD) was studied by X-ray peak profile analysis. The formation of submicron grain sized structures was studied as a function of the number of ECAP passes. Thermal stability of the microstructure in both copper and titanium was examined by differential scanning calorimetry (DSC). During the isothermal heat-treatment of copper a bi-modal microstructure was formed, as manifested in a special shape of the peak profiles. In titanium, a considerable fraction of dislocations gets annihilated at temperatures well below the exothermic peak in the DSC curve.

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