Synergies between simulations and experiments in nanocrystalline metals
|Helena Van Swygenhoven|
ASQ division- Materials and Reasearch, Paul Scherrer Institute (ASQ-PSI), PSI-Villigen, Villigen 5232, Switzerland
Atomistic simulations have provided unprecedented insight into the structural and mechanical properties of nanocrystalline materials, highlighting the role of the non-equilibrium grain boundary structure in both inter- and intra-grain deformation processes. One of the most important results is the capability of the nanosized grain boundary to act as source and sink for dislocations, in other words a deformation mechanism that does not leave behind dislocation debris. The dislocation activity suggested by molecular dynamics for four different nc-fcc metals, Al, Cu, Ni and Au are discussed in terms of the inherent restrictions and caveats of the simulation technique and in terms of material properties such as the generalized stacking fault energy curves. Details about the nucleation and propagation mechanism and their relation to grain boundary structures and grain boundary misorientations will be presented.
Presentation: invited oral at E-MRS Fall Meeting 2005, Symposium I, by Helena Van Swygenhoven
See On-line Journal of E-MRS Fall Meeting 2005
Submitted: 2005-04-27 13:26 Revised: 2009-06-07 00:44