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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

—

Projekt

<a href="/cs/project/ED1.1.00%2F02.0068" target="_blank" >ED1.1.00/02.0068: CEITEC - central european institute of technology</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Materials Science & Technology

ISSN

1005-0302

e-ISSN

—

Svazek periodika

32

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

1309-1320

Kód UT WoS článku

000392557600014

EID výsledku v databázi Scopus

2-s2.0-85006240215