title: Velocity-dependent fatigue crack paths in nanograined Pt films.
abstract: Studies of crack growth in nanograined films assert that mechanical damage accumulates at grain boundaries irrespective of the crack velocity and loading conditions. This work shows that crack advance in nanograined Pt films involves a dislocation-slip mechanism that is a function of the crack growth rate and mode of loading. Crack paths in Pt were initially intergranular, but transitioned to a transgranular mode that persisted until catastrophic failure. This research demonstrates that crack growth mechanisms modeled for nanograined Ni cannot be generalized to other pure, metallic systems.
authors.affiliation: Department of Materials Science and Engineering and The Materials Research Institute, The Pennsylvania State University, 202B Steidle Building, University Park, Pennsylvania 16802, USA.
authors.forename: R A
authors.initials: RA
authors.lastname: Meirom
authors.forename: T
authors.initials: T
authors.lastname: Clark
authors.forename: R
authors.initials: R
authors.lastname: Polcawich
authors.forename: J
authors.initials: J
authors.lastname: Pulskamp
authors.forename: M
authors.initials: M
authors.lastname: Dubey
authors.forename: C L
authors.initials: CL
authors.lastname: Muhlstein