Study of structure of naturally aged aluminium after twist channel angular pressing\n

0506875 - ÚFM 2020 RIV US eng J - Článek v odborném periodiku
Kunčická, Lenka - Kocich, R. - Ryukhtin, Vasil - Cullen, J.C.T. - Lavery, N.P.
Study of structure of naturally aged aluminium after twist channel angular pressing
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Materials Characterization. Roč. 152, JUN (2019), s. 94-100. ISSN 1044-5803. E-ISSN 1873-4189
Grant CEP: GA ČR(CZ) GA19-15479S; GA MŠMT LM2015056
Institucionální podpora: RVO:68081723 ; RVO:61389005
Klíčová slova: Twist channel angular pressing * Aluminium * Electron microscopy * Small-angle neutron scattering * Electric resistivity * Precipitation
Obor OECD: Materials engineering; Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics (UJF-V)
Impakt faktor: 3.562, rok: 2019
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/pii/S1044580318335915?via%3Dihub

Twist channel angular pressing (TCAP), the severe plastic deformation (SPD) technology developed recently to increase the efficiency of the imposed strain and its homogeneity within a single pass, is an effective process combining channel bending and twist extrusion in a single die. The presented study analyses the phenomena of substructure development, precipitation, structural units' orientations, and the occurrence of residual stress, as well as electric resistivity and microhardness, in commercial purity aluminium naturally aged for two years at room temperature after processing via single pass TCAP. The results are compared with the findings for the TCAP sample right after processing, selected results are also compared with the results for the sample after TCAP and one year of natural ageing, and with a sample processed by conventional ECAP. The analyses showed the substructure to recover substantially, the grain size decreased to submicron size. The residual stress within the grains introduced by the energy accumulated via the severe imposed strain relaxed significantly by the structure restoration, as well as by intensive precipitation. The aged TCAP sample specific electric resistivity was comparable to the resistivity of the original commercially pure aluminium (2.652E-05 and 2.635E-05 Ω·mm 2 ·m −1 , respectively), however, the microhardness mapping showed increased mechanical properties with homogeneous distribution.
Trvalý link: http://hdl.handle.net/11104/0298653