title: Mechanical properties of micro- and nanocrystalline diamond foils.
abstract: Diamond coating of suitable template materials and subsequent delamination allows for the manufacturing of free-standing diamond foil. The evolution of the microstructure can be influenced by secondary nucleation via control of process conditions in the hot-filament chemical vapour deposition process. Bending tests show extraordinarily high strength (more than 8 GPa), especially for diamond foils with nanocrystalline structure. A detailed fractographic analysis is conducted in order to correlate measured strength values with crack-initiating defects. The size of the failure causing flaw can vary from tens of micrometres to tens of nanometres, depending on the diamond foil microstructure as well as the loading conditions.
authors.affiliation: Chair of Metals Science and Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 5, 91058 Erlangen, Germany matthias.lodes@fau.de.
authors.forename: M A
authors.initials: MA
authors.lastname: Lodes
authors.affiliation: Chair of Metals Science and Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 5, 91058 Erlangen, Germany.
authors.forename: F S
authors.initials: FS
authors.lastname: Kachold
authors.affiliation: Chair of Metals Science and Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 5, 91058 Erlangen, Germany.
authors.forename: S M
authors.initials: SM
authors.lastname: Rosiwal
keywords: fractography; hot-filament chemical vapour deposition; mechanical testing by tensile test and ball-on-three-balls bending test; self-supporting nanocrystalline diamond foil