title: On the reliability of powder diffraction Line Profile Analysis of plastically deformed nanocrystalline systems.
abstract: An iron-molybdenum alloy powder was extensively deformed by high energy milling, so to refine the bcc iron domain size to nanometer scale (~10 nm) and introduce a strong inhomogeneous strain. Both features contribute to comparable degree to the diffraction peak profile broadening, so that size and strain contributions can be easily separated by exploiting their different dependence on the diffraction angle. To assess the reliability of Line Profile Analysis, results were compared with evidence from other techniques, including scanning and transmission electron microscopy and X-ray small angle scattering. Results confirm the extent of the size broadening effect, whereas molecular dynamics simulations provide insight into the origin of the local atomic, inhomogeneous strain, pointing out the role of dislocations, domain boundaries and interactions among crystalline domains.
authors: Elettra-Sincrotrone Trieste, Mechanical, Vacuum and Optic Engineering Group, Trieste, 34149, Italy.
authors: Luca
authors: L
authors: Rebuffi
authors: Lund University, Department of Physics, Lund, SE-221 00, Sweden.
authors: Andrea
authors: A
authors: Troian
authors: CNR-IOM TASC, Trieste, 34149, Italy.
authors: Regina
authors: R
authors: Ciancio
authors: CNR-IOM TASC, Trieste, 34149, Italy.
authors: Elvio
authors: E
authors: Carlino
authors: University of Trento, Department of Civil, Environmental and Mechanical Engineering, Trento, 38123, Italy.
authors: Amine
authors: A
authors: Amimi
authors: Indiana University, Department of Geological Sciences, Bloomington (IN), 47405, USA.
authors: Alberto
authors: A
authors: Leonardi
authors: University of Trento, Department of Civil, Environmental and Mechanical Engineering, Trento, 38123, Italy.
authors: Paolo
authors: P
authors: Scardi