Achieving Large Uniform Tensile Ductility in Nanocrystalline Metals

TitleAchieving Large Uniform Tensile Ductility in Nanocrystalline Metals
Publication TypeJournal Article
Year of Publication2010
AuthorsWang YM, Ott RT, Hamza AV, Besser MF, Almer J, Kramer MJ
Journal TitlePhysical Review Letters
Date Published11/17
ISBN Number0031-9007
Accession NumberISI:000284308500019
Keywordscobalt, PLASTIC-DEFORMATION, strength

Synchrotron x-ray diffraction and high-resolution electron microscopy revealed the origin of different strain hardening behaviors (and dissimilar tensile ductility) in nanocrystalline Ni and nanocrystalline Co. Planar defect accumulations and texture evolution were observed in Co but not in Ni, suggesting that interfacial defects are an effective passage to promote strain hardening in truly nanograins. Twinning becomes less significant in Co when grain sizes reduce to below similar to 15 nm. This study offers insights into achieving excellent mechanical properties in nanocrystalline materials.

URL<Go to ISI>://000284308500019
Alternate JournalPhys Rev Lett