Vacancy-solute aggregates in Al-Cu-Mg alloys studied by positron annihilation techniques

Autor:	G. Riontino, G. Ferro, Maurizio Biasini, P. Folegati
Jazyk:	angličtina
Rok vydání:	2001
Předmět:	Chemical species Materials science Nuclear magnetic resonance Positron Differential scanning calorimetry Vacancy defect Alloy Kinetics Analytical chemistry engineering engineering.material Spectroscopy Doppler broadening
Popis:	Vacancy-solute aggregates formed in the alloy Al-Cu (4.38 wt %)-Mg (1.62 wt %) were studied by two different positron annihilation techniques (lifetime spectroscopy and two-detectors Doppler broadening spectroscopy) and by differential scanning calorimetry (DSC). The results show that the concentration of Cu in the environment of a vacancy increases when the temperature of aging is raised from 20 to 60 \ifmmode^\circ\else\textdegree\fi{}C. Structural transformations, which produce a reordering of the chemical species in contact with vacancies and an energetic stabilization of the solute aggregates, are observed to occur at room temperature after aging at 180 \ifmmode^\circ\else\textdegree\fi{}C through effects on the kinetics of the average positron lifetime as well as on DSC thermograms.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c65845510e122091496faec742a0d737 http://hdl.handle.net/2318/9409 Zobrazit plný text záznamu