Microstructure and vacancy-type defects of high-pressure torsion deformed Al-3 wt%Cu alloy

Autor:	Herbert Reingruber, M. Faller, Peter Parz, Werner Puff, Roland Würschum, Reinhard Pippan
Rok vydání:	2012
Předmět:	Materials science Precipitation (chemistry) Metallurgy Alloy General Physics and Astronomy engineering.material Microstructure Nanocrystalline material Positron annihilation spectroscopy Vacancy defect engineering Composite material Spectroscopy Doppler broadening
Zdroj:	Journal of Applied Physics. 112:103506
ISSN:	1089-7550 0021-8979
Popis:	The influence of high-pressure torsion (HPT) on the microstructure and free-volume type defects of supersaturated Al-3 wt%Cu was studied. By means of HPT, grain refinement down to sizes of 100 nm could be achieved. Positron annihilation spectroscopy was applied for the characterization of deformation-induced defects and of vacancy-solute interaction. The chemical sensitive method of two-dimensional Doppler broadening spectroscopy reveals predominantly deformation-induced defects. In comparison to undeformed supersaturated Al-3 wt%Cu, the fraction of Cu-decorated free-volume type defects is strongly reduced and Al2Cu-precipitates with equilibrium structure occur rather than metastable semi-coherent Al-Cu precipitates. These precipitates stabilize the nanocrystalline structure and give rise to a rather different aging behaviour compared to the undeformed state.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::990d5b0957e1f0168673e9f048e216dc https://doi.org/10.1063/1.4765034 Zobrazit plný text záznamu