Dynamic restoration of severely predeformed, ultrafine-grained pure Cu at 373 K observed in situ

0482058 - ÚFM 2018 RIV US eng J - Článek v odborném periodiku
Král, Petr - Blum, W. - Dvořák, Jiří - Eisenlohr, P. - Petrenec, M. - Sklenička, Václav
Dynamic restoration of severely predeformed, ultrafine-grained pure Cu at 373 K observed in situ.
Materials Characterization. Roč. 134, DEC (2017), s. 329-334. ISSN 1044-5803. E-ISSN 1873-4189
Grant CEP: GA MŠMT(CZ) LQ1601
Institucionální podpora: RVO:68081723
Klíčová slova: ECAP * Dynamic grain coarsening * UFG copper * In situ
Obor OECD: Materials engineering
Impakt faktor: 2.892, rok: 2017

Microstructure changes of ultrafine-grained pure copper prepared by equal-channel angular pressing were investigated during in situ tensile testing inside a scanning electron microscope at constant total strain rate of 10-4 s-1 at 373 K (~ 0.28 Tm). After fast work hardening the flow stress saturated at an inelastic strain of 0.06. Significant local coarsening of grains was observed to start at about 2/3 of the maximum flow stress. However, these localized events did not significantly change the mean grain size up to an inelastic strain of 0.09. Surface observations showed that the coarsening was preferentially located at shear bands.
Trvalý link: http://hdl.handle.net/11104/0277460