Temperature-dependent competing deformation mechanisms in nanocrystalline metals

TitleTemperature-dependent competing deformation mechanisms in nanocrystalline metals
Publication TypeJournal Article
Year of Publication2012
AuthorsWang YM, Ott RT, Besser MF, Hamza AV
Journal TitlePhysical Review B
Volume85
Pages144122
Date Published04
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000303386600002
KeywordsDislocations, ni, nickel, PLASTIC-DEFORMATION, POWDER, room-temperature, size, strain-rate sensitivity, strength, SUPERPLASTICITY
Abstract

In situ synchrotron x-ray diffraction experiments have been performed to elucidate the competing deformation mechanisms of nanocrystalline nickel at elevated temperatures (150-300 degrees C) and high strain rates. The observed lattice strain deviations, average grain sizes, and dislocation density at various stages of deformation and different temperatures suggest a strong dependence of dislocation slips and grain boundary sliding upon strain and temperature. The heating profile is found to strongly influence the microstructure and thus is a relevant parameter to consider when interpreting and comparing various experimental results.

URL<Go to ISI>://WOS:000303386600002
DOI10.1103/PhysRevB.85.144122
Alternate JournalPhys. Rev. B