Fatigue property and fatigue cracks of ultra-fine grained copper processed by equal-channel angular pressing

0358391 - ÚFM 2012 RIV CH eng J - Journal Article
Wang, Q. - Du, Z. - Liu, X. - Kunz, Ludvík
Fatigue property and fatigue cracks of ultra-fine grained copper processed by equal-channel angular pressing.
Key Engineering Materials. Roč. 2011, č. 682 (2011), s. 231-237. ISSN 1013-9826
Institutional research plan: CEZ:AV0Z20410507
Keywords : ultrafine-grained copper * equal channel angular pressing * fatigue * fatigue cracks
Subject RIV: JL - Materials Fatigue, Friction Mechanics

Fatigue life, cyclic deformation behavior and microstructure of ultrafine-grained (UFG) copper produced by ECAP were tested and observed. Development of surface relief and fracture surfaces was observed. The results show that the UFG Cu has lower ductility and its strain controlled cyclic properties are worse than those of lower strength conventional grained counterparts. All the ECAP specimens display obvious cyclic softening under the applied range. The cyclic softening ratio increases with increasing strain amplitude. The formation of shear bands and grain boundary sliding are the main factors causing fatigue crack nucleation as well as the fatigue failure.
Permanent Link: http://hdl.handle.net/11104/0196453