University of Wollongong
Browse

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

Download (5.03 MB)
journal contribution
posted on 2024-11-15, 19:29 authored by Hailiang YuHailiang Yu, Anh TieuAnh Tieu, Cheng LuCheng Lu, Xiong LiuXiong Liu, Mao Liu, Ajit Godbole, Charlie Kong, Q Qin
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.

History

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, 15 (9568), 1-9.

Journal title

Scientific Reports

Volume

5

Language

English

RIS ID

99814

Usage metrics

    Categories

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC