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Transgranular liquation cracking of grains in the semi-solid state

Karagadde, S; Lee, PD; Cai, B; Fife, JL; Azeem, MA; Kareh, KM; Puncreobutr, C; ... Atwood, RC; + view all (2015) Transgranular liquation cracking of grains in the semi-solid state. Nature Communications , 6 , Article 8300. 10.1038/ncomms9300. Green open access

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Abstract

Grain refinement via semi-solid deformation is desired to obtain superior mechanical properties of cast components. Using quantitative in situ synchrotron X-ray tomographic microscopy, we show an additional mechanism for the reduction of grain size, via liquation assisted transgranular cracking of semi-solid globular microstructures. Here we perform localized indentation of Al-15wt.%Cu globular microstructures, with an average grain size of ∼480 μm, at 555 °C (74% solid fraction). Although transgranular fracture has been observed in brittle materials, our results show transgranular fracture can also occur in metallic alloys in semi-solid state. This transgranular liquation cracking (TLC) occurs at very low contact stresses (between 1.1 and 38 MPa). With increasing strain, TLC continues to refine the size of the microstructure until the grain distribution reaches log-normal packing. The results demonstrate that this refinement, previously attributed to fragmentation of secondary arms by melt-shearing, is also controlled by an additional TLC mechanism.

Type: Article
Title: Transgranular liquation cracking of grains in the semi-solid state
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/ncomms9300
Publisher version: https://doi.org/10.1038/ncomms9300
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Science & Technology, Multidisciplinary Sciences, Science & Technology - Other Topics, SYNCHROTRON TOMOGRAPHIC QUANTIFICATION, X-RAY TOMOGRAPHY, AL-CU ALLOY, IN-SITU, ALUMINUM-ALLOYS, STRESS-CORROSION, DEFORMATION, BEHAVIOR, FRACTURE, TEMPERATURE
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10064794
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