[Kovove materialy - Metallic materials]
    Fri - March 29, 2024 - 15:34 No. of hits : 1736714 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 54 (2016), Issue 6

Creep properties of aluminium processed by ECAP
KRAL, P., DVOŘÁK, J., JÄGER, A., KVAPILOVÁ, M., HORITA, Z., SKLENIČKA, V.
vol. 54 (2016), no. 6, pp. 441 - 451
DOI: 10.4149/km_2016_6_441

Abstract
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.

Key words
equal channel angular pressing (ECAP), aluminium, ultrafine-grained microstructure, creep

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


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