Examination of inverse Hall-Petch relation in nanostructured aluminum alloys by ultra-severe plastic deformation

نویسندگان

چکیده

To have an insight into the occurrence of inverse Hall-Petch relationship in ultrafine-grained (UFG) aluminum alloys produced by severe plastic deformation (SPD), ultra-SPD (i.e. inducing several ten thousand shear strains via high-pressure torsion, HPT) followed aging is applied to Al-La-Ce alloy. Average nanograin sizes 40 and 80 nm are successfully achieved together with strain-induced Lomer-Cottrell dislocation lock formation aging-induced semi-coherent Al11(La,Ce)3 precipitation. Analysis hardening mechanisms this alloy compared SPD-processed pure micrometer grain sizes, Al-based submicrometer ultra-SPD-processed Al-Ca reveals presence two breaks relationship. First, a positive up-break appears when decrease from which due extra solute-dislocation interactions. Second, negative down-break softening occur decreasing nanometer caused weakening mechanism minor contribution mechanism. Detailed analyses confirm that not necessarily solution for other accompanying strategies such as grain-boundary segregation precipitation required overcome softening.

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ژورنال

عنوان ژورنال: Journal of Materials Science & Technology

سال: 2021

ISSN: ['1941-1162', '1005-0302']

DOI: https://doi.org/10.1016/j.jmst.2021.01.096