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MM: Fachverband Metall- und Materialphysik

MM 34: Topical Session Bulk Nanostrucured Materials VII - Mechanical Properties II

MM 34.5: Vortrag

Mittwoch, 28. März 2012, 12:45–13:00, H 0107

Fracture behavior of copper: Ultrafine-grained vs. coarse-grained microstructure — •Anton Hohenwater and Reinhard Pippan — Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, A-8700 Leoben, Austria

The fracture behavior of ultrafine-grained copper produced by high pressure torsion was evaluated by means of elasto-plastic fracture mechanics. The fracture toughness was quantitatively measured by JIC as a global measure by recording the crack growth resistance curve. As a local fracture parameter the initiation toughness in terms of the crack opening displacement (CODi) was evaluated by using an automatic fracture surface analysis system. The results show a remarkably high global fracture toughness, JIC, but at the same time a low fracture initiation toughness, Ji. In this contribution reasons for the large difference between these two parameters will be discussed and a comparison of the fracture mechanical performance of ultrafine-grained with coarse-grained copper will be given.