Microstructure of severely deformed metals from X-ray line profile analysis

Gubicza, Jenő and Nam, N. H. and Máthis, K. and Stolyarov, V. V. (2006) Microstructure of severely deformed metals from X-ray line profile analysis. Zeitschrift für Kristallographie, 23. pp. 93-98. ISSN 0044-2968

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Abstract

Two essentially different materials, cubic Ti(49.8)Ni(50.2) shape memory alloy and hexagonal AZ91 Mg alloy, were deformed by equal channel angular pressing (ECAP). The microstructure developed as a result of severe plastic deformation was studied by X-ray line profile analysis. The correlation between the microstructure and the mechanical behavior was also investigated. Below 100 degrees C the tensile strength of the Mg alloy increased as a consequence of the increase of the dislocation density owing to ECAP. Above 200 degrees C the strength decreased and the ductility increased as a result of the breakage of the Al(12)Mg(17) precipitates due to ECAP. The analysis of the dislocation contrast factors of Ti(49.8)Ni(50.2) revealed that < 100 >{110} dislocations with < 111 > line vector formed during ECAP.

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