title: Extrinsic and intrinsic fracture behavior of high pressure torsion deformed nickel.
abstract: Nickel discs (>99.5 wt.%) were deformed by high pressure torsion (HPT) at different temperatures (-196 °C, 25 °C, 200 °C, and 400 °C) until saturation was reached. The strength and fracture behavior of microdefect-free samples and samples with inclusions were investigated using micro and macro tensile tests, respectively. The fracture behavior is not sensitive to the HPT deformation temperature but differs significantly in the two types of sample. The ultimate tensile strength is not affected by inclusions or grain texture.
authors.affiliation: Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, A-8700 Leoben, Austria.
authors.forename: Georg B
authors.initials: GB
authors.lastname: Rathmayr
authors.forename: Reinhard
authors.initials: R
authors.lastname: Pippan
keywords: Fracture; High pressure torsion; Nickel; Severe plastic deformation; Size effect