Metalurgija, Vol. 47 No. 4, 2008.
Izvorni znanstveni članak
Formation of ultrafine-grained (UFG) structure and mechanical properties by severe plastic deformation (SPD)
M. Besterci
; Institute of Materials Research of Slovak Academy of Sciences, Košice, Slovak Republic
T. Kvačkaj
; Faculty of Metallurgy, Technical University in Košice, Slovak Republic
R. Kočiško
; Faculty of Metallurgy, Technical University in Košice, Slovak Republic
J. Bacsó
; Faculty of Metallurgy, Technical University in Košice, Slovak Republic
K. Sulleiová
; Institute of Materials Research of Slovak Academy of Sciences, Košice, Slovak Republic
Sažetak
Commercial pure cooper (99,9% Cu) was deformed by equal channel angular pressing (ECAP) using up to 10 passes, route C. The evolution of microstructure and fracture character were observed by OM, SEM and TEM. The mean grain size decreased with increasing deformation, after 10 passes to 100 – 300 nm. TEM analysis suggested the possible nanostructure formation mechanism by the formation of cellular structure in grains, forming of subgrains and then forming of high angle nanograins with random orientation. Fractures of ECAP Cu material after 10 passes had transcrystalline ductile character with dimple morphology.
Ključne riječi
severe plastic deformation; ultrafine-grained materials; equal channel angular pressin; TEM; fracture surface
Hrčak ID:
26036
URI
Datum izdavanja:
1.10.2008.
Posjeta: 2.452 *