Effects of Grain Refinement by ECAP on the Deformation Resistance ofnAl Interpreted in Terms of Boundary-Mediated Processes

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F16%3A00468252" target="_blank" >RIV/68081723:_____/16:00468252 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.jmst.2016.08.028" target="_blank" >http://dx.doi.org/10.1016/j.jmst.2016.08.028</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jmst.2016.08.028" target="_blank" >10.1016/j.jmst.2016.08.028</a>

Result language
angličtina
Original language name
Effects of Grain Refinement by ECAP on the Deformation Resistance ofnAl Interpreted in Terms of Boundary-Mediated Processes
Original language description
Results of a large set of tensile and compressive creep tests on pure Al were reanalyzed for the influencenof low- and high-angle grain boundaries on the deformation resistance at the temperaturenT = 473 K = 0.51Tm where Tm is the melting point. Thermomechanical treatment by equal channel angularnpressing followed by heating to T led to strong increase of areal fraction of high-angle boundaries in anstructure of subgrains of 106 m in size, accompanied by significant reduction of subgrain strengtheningnand of the stress sensitivity of the deformation rate. (Sub)grain strengthening by low-angle boundariesnis most effective; the strengthening effect virtually disappears during creep as the boundary spacingsncoarsen toward their stress-dependent, quasi-stationary size wqs. The same type of coarsening is foundnfor (sub)grain structures with large fraction of high-angle boundaries; in the quasi-stationary state theynlead to softening at low and strengthening at high stresses, and a significant increase in tensile fracturenstrain to values up to 0.8. The results are analogous to former results for Cu and are explained in thensame way by the influence of boundaries on storage and recovery of crystal defects and the homogenizationnof glide.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
JG - Metallurgy, metal materials
OECD FORD branch
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Project
<a href="/en/project/ED1.1.00%2F02.0068" target="_blank" >ED1.1.00/02.0068: Central european institute of technology</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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