Creep properties of aluminium processed by ECAP

0471641 - ÚFM 2017 RIV SK eng J - Journal Article
Král, Petr - Dvořák, Jiří - Jäger, Aleš - Kvapilová, Marie - Horita, Z. - Sklenička, Václav
Creep properties of aluminium processed by ECAP.
Kovové materiály. Roč. 54, č. 6 (2016), s. 441-451. ISSN 0023-432X. E-ISSN 1338-4252
R&D Projects: GA MŠMT(CZ) LQ1601
Institutional support: RVO:68081723 ; RVO:68378271
Keywords : equal channel angular pressing (ECAP) * aluminium * ultrafine-grained microstructure * creep
Subject RIV: JG - Metallurgy; JG - Metallurgy (FZU-D)
Impact factor: 0.366, year: 2016

The creep behaviour of pure polycrystalline aluminium and single crystals processed by
equal-channel angular pressing (ECAP) was investigated in order to understand the relationships
between heterogeneity of microstructure and creep behaviour. Tensile creep tests
were performed at 373 K on specimens processed by 1 and 4 ECAP passes. For comparison
purposes, the creep tests were also carried out on coarse-grained specimens. Microstructure
analyses showed that application of ECAP technique on polycrystalline aluminium and single
crystals led to the formation of significantly different microstructures even after a relatively
high number of ECAP passes. The different creep behaviour of ECAP-processed single crystals
and polycrystalline aluminium is influenced by inhomogeneity of microstructure. Further,
the creep behaviour of specimens processed by 4 ECAP passes is affected by grain-boundary
mediated processes like enhanced recovery of dislocations at high-angle grain boundaries in
grains finer than quasi-stationary subgrain size and grain boundary sliding.
Permanent Link: http://hdl.handle.net/11104/0269057