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Effects of Grain Refinement by ECAP on the Deformation Resistance of\nAl Interpreted in Terms of Boundary-Mediated Processes
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SYSNO ASEP 0468252 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effects of Grain Refinement by ECAP on the Deformation Resistance of
Al Interpreted in Terms of Boundary-Mediated ProcessesAuthor(s) Blum, W. (DE)
Dvořák, Jiří (UFM-A) RID, ORCID
Král, Petr (UFM-A) RID, ORCID
Eisenlohr, P. (US)
Sklenička, Václav (UFM-A) RID, ORCIDNumber of authors 5 Source Title Journal of Materials Science & Technology. - : Chinese Academy of Sciences - ISSN 1005-0302
Roč. 32, č. 12 (2016), s. 1309-1320Number of pages 12 s. Language eng - English Country NL - Netherlands Keywords Deformation ; Grain boundaries ; Equal channel angular pressing (ECAP) ; Creep ; Dynamic recovery ; Fine grained microstructure Subject RIV JG - Metallurgy R&D Projects ED1.1.00/02.0068 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFM-A - RVO:68081723 UT WOS 000392557600014 EID SCOPUS 85006240215 DOI 10.1016/j.jmst.2016.08.028 Annotation Results of a large set of tensile and compressive creep tests on pure Al were reanalyzed for the influence
of low- and high-angle grain boundaries on the deformation resistance at the temperature
T = 473 K = 0.51Tm where Tm is the melting point. Thermomechanical treatment by equal channel angular
pressing followed by heating to T led to strong increase of areal fraction of high-angle boundaries in a
structure of subgrains of ≈10−6 m in size, accompanied by significant reduction of subgrain strengthening
and of the stress sensitivity of the deformation rate. (Sub)grain strengthening by low-angle boundaries
is most effective; the strengthening effect virtually disappears during creep as the boundary spacings
coarsen toward their stress-dependent, quasi-stationary size wqs. The same type of coarsening is found
for (sub)grain structures with large fraction of high-angle boundaries; in the quasi-stationary state they
lead to softening at low and strengthening at high stresses, and a significant increase in tensile fracture
strain to values up to 0.8. The results are analogous to former results for Cu and are explained in the
same way by the influence of boundaries on storage and recovery of crystal defects and the homogenization
of glide.Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2017
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