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A new insight into ductile fracture of ultrafine-grained Al-Mg alloys

Journal Article


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Abstract


  • It is well known that when coarse-grained metals undergo severe plastic deformation to be transformed into

    nano-grained metals, their ductility is reduced. However, there are no ductile fracture criteria developed

    based on grain refinement. In this paper, we propose a new relationship between ductile fracture and grain

    refinement during deformation, considering factors besides void nucleation and growth. Ultrafine-grained

    Al-Mg alloy sheets were fabricated using different rolling techniques at room and cryogenic temperatures. It

    is proposed for the first time that features of the microstructure near the fracture surface can be used to

    explain the ductile fracture post necking directly. We found that as grains are refined to a nano size which

    approaches the theoretical minimum achievable value, the material becomes brittle at the shear band zone.

    This may explain the tendency for ductile fracture in metals under plastic deformation.

Publication Date


  • 2015

Citation


  • Yu, H., Tieu, A. Kiet., Lu, C., Liu, X., Liu, M., Godbole, A., Kong, C. & Qin, Q. (2015). A new insight into ductile fracture of ultrafine-grained Al-Mg alloys. Scientific Reports, 5 09568-1-09568-9.

Scopus Eid


  • 2-s2.0-84926636705

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4771&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3752

Has Global Citation Frequency


Start Page


  • 09568-1

End Page


  • 09568-9

Volume


  • 5

Place Of Publication


  • United Kingdom

Abstract


  • It is well known that when coarse-grained metals undergo severe plastic deformation to be transformed into

    nano-grained metals, their ductility is reduced. However, there are no ductile fracture criteria developed

    based on grain refinement. In this paper, we propose a new relationship between ductile fracture and grain

    refinement during deformation, considering factors besides void nucleation and growth. Ultrafine-grained

    Al-Mg alloy sheets were fabricated using different rolling techniques at room and cryogenic temperatures. It

    is proposed for the first time that features of the microstructure near the fracture surface can be used to

    explain the ductile fracture post necking directly. We found that as grains are refined to a nano size which

    approaches the theoretical minimum achievable value, the material becomes brittle at the shear band zone.

    This may explain the tendency for ductile fracture in metals under plastic deformation.

Publication Date


  • 2015

Citation


  • Yu, H., Tieu, A. Kiet., Lu, C., Liu, X., Liu, M., Godbole, A., Kong, C. & Qin, Q. (2015). A new insight into ductile fracture of ultrafine-grained Al-Mg alloys. Scientific Reports, 5 09568-1-09568-9.

Scopus Eid


  • 2-s2.0-84926636705

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4771&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3752

Has Global Citation Frequency


Start Page


  • 09568-1

End Page


  • 09568-9

Volume


  • 5

Place Of Publication


  • United Kingdom