The influence of long-term annealing at room temperature on creep behaviour of ECAP-processed copper

0470411 - ÚFM 2018 RIV NL eng J - Journal Article
Král, Petr - Dvořák, Jiří - Kvapilová, Marie - Blum, W. - Sklenička, Václav
The influence of long-term annealing at room temperature on creep behaviour of ECAP-processed copper.
Materials Letters. Roč. 188, FEB (2017), s. 235-238. ISSN 0167-577X. E-ISSN 1873-4979
R&D Projects: GA MŠMT(CZ) LQ1601
Institutional support: RVO:68081723
Keywords : Equal-channel angular pressing (ECAP) * Ultrafine-grained microstructure * Creep behaviour * Microstructure stability
OECD category: Materials engineering
Impact factor: 2.687, year: 2017

Present work investigates the effect of long-term annealing at low homologous temperature (~0.22 Tm) on creep
behaviour of pure copper (99.99%) processed by equal-channel angular pressing (ECAP). Coarse-grained pure
copper was processed by 1 and 8 ECAP passes at room temperature. The ECAP-processed specimens were
annealed at room temperature for 3 years. Microstructures of ECAP-processed specimens and their room
temperature-annealed states were investigated by electron back scatter diffraction (EBSD) technique. Tensile
tests were performed at room temperature under constant rate and at 373 K in creep under constant load. It was
found that long-term annealing at room temperature led to occurrence of large grains in microstructure which
influenced the strength. The influence grew with number of ECAP passes.
Permanent Link: http://hdl.handle.net/11104/0268100