Shear banding-induced (c plus a) slip enables unprecedented strength-ductility combination of laminated metallic composites

0557389 - ÚJF 2023 RIV CN eng J - Článek v odborném periodiku
Jiang, S. - Peng, R. L. - Máthis, K. - Yan, H. - Farkas, Gergely - Hegedues, Z. - Lienert, U. - Movarare, J. - Zhao, X. - Zuo, L. - Jia, N. - Wang, Y.
Shear banding-induced (c plus a) slip enables unprecedented strength-ductility combination of laminated metallic composites.
Journal of Materials Science & Technology. Roč. 110, MAY (2022), s. 260-268. ISSN 1005-0302
Grant CEP: GA MŠMT LM2018111
Institucionální podpora: RVO:61389005
Klíčová slova: dislocation slip * ductility * high-energy X-ray diffraction * laminated metallic composites * shear band
Obor OECD: Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics
Impakt faktor: 10.9, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.jmst.2021.09.032

Shear bands in metallic materials have been reported to be catastrophic because they normally lead to non-uniform plastic deformation. Ductility of laminated metallic composites deteriorates with increasing processing strain, particularly for those having hexagonal-close-packed (hcp) constituents due to inadequate slip systems and consequently prominent shear banding. Here, we propose a design strategy that counterintuitively tolerates the bands with localized strains, i.e. the shear banded laminar (SBL) structure, which promotes ( c + a ) dislocation activation in hcp metals and renders unprecedented strengthductility combination in hcp-metal-based composites fabricated by accumulative roll bonding (ARB). The SBL structure is characterized with one soft hcp metal constrained by adjacent hard metal in which dislocations have been accumulated near the bimetal interfaces. High-energy X-ray diffraction astonishingly reveals that more than 90% of dislocations are non-basal in Ti layers of the SBL Ti/Nb composite processed by eight ARB cycles. Moreover, ( c+a ) dislocations occupy a high fraction of -30%, promoting further ( c+a ) cross slip. The unique stress field tailored by both shear banding and heterophase interface-mediated deformation accommodation triggers important ( c+a ) slip. This SBL design is of significance for developing hcp-based laminates and other heterostructured materials with high performances.
Trvalý link: http://hdl.handle.net/11104/0331427