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Calorimetric and X-ray measurements in ultrafine-grained nickel

Zhilyaev, A. P. and Gubicza, Jenő and Surinach, S. and Baró, M. D. and Langdon, T. G. (2003) Calorimetric and X-ray measurements in ultrafine-grained nickel. In: 4th International Conference on Processing and Manufacturing of Advanced Materials, 2003. július 7-11., UNIVERSIDAD CARLOS III DE MADRID; MADRID, SPAIN.

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Abstract

The procedures of X-ray diffractometry and peak profile analysis, together with differential scanning calorimetry (DSC), were used to measure the grain size, dislocation density and corresponding elastic energy stored in ultrafine-grained (UFG) nickel processed by different methods: equal channel angular pressing, high pressure torsion and their combinations. It has been shown that grain growth in these samples begins at temperatures in the range from 500 to 700 K and the measured activation energy for grain growth is close to the activation energy for grain boundary self-diffusion. A difference between the released enthalpy in DSC experiments and the elastic energy evaluated by x-ray diffractometry is attributed to the decrease in surface energy during grain growth in UFG nickel. The grain boundary (GB) surface energy of high angle boundaries was also evaluated.

Item Type: Conference or Workshop Item (Paper)
Subjects: Q Science / természettudomány > QC Physics / fizika
Depositing User: Erika Bilicsi
Date Deposited: 15 Oct 2012 12:35
Last Modified: 15 Oct 2012 12:35
URI: http://real.mtak.hu/id/eprint/3118

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