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Semi-solid compression of nano/micro-particle reinforced Al-Cu composites: An in situ synchrotron tomographic study

Wang, W; Guo, E; Phillion, AB; Eskin, DG; Wang, T; Lee, PD; (2020) Semi-solid compression of nano/micro-particle reinforced Al-Cu composites: An in situ synchrotron tomographic study. Materialia , 12 , Article 100817. 10.1016/j.mtla.2020.100817. Green open access

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Abstract

Four-dimensional fast synchrotron X-ray tomography has been used to investigate the semi-solid deformation of nano- and micro-particle reinforced aluminum-copper composites (Al-10 wt% Cu alloy with ~1.0 wt% Al_{2}O_{3} nano and ~1.0 wt% Al_{2}O_{3} micro particles). Quantitative image analysis of the semi-solid deformation behavior of three alloys (base, nano- and micro-particle reinforced) revealed the influence of the particulate size on both microstructural formation and dominant deformation mechanisms. The results showed that initial void closure and incubation period were present in the particle-free and nano-particle reinforced Al-Cu composite during semi-solid compression, while the micro-particle reinforced alloy only showed continual void growth and coalescence into cracks. The results suggest that the nano-particle reinforced composite has the best hot-tearing resistance amongst the three alloys. Improved hot-tear performance with nano-particulate reinforcement was attributed to the small liquid channel thickness, fine grain size which alters the distribution/morphology of the liquid channels, more viscous inter-dendritic liquid, and fewer initial voids.

Type: Article
Title: Semi-solid compression of nano/micro-particle reinforced Al-Cu composites: An in situ synchrotron tomographic study
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.mtla.2020.100817
Publisher version: https://doi.org/10.1016/j.mtla.2020.100817
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
Keywords: Metal matrix composites, Semi-solid deformation, Dilatancy, Hot-tearing
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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/10108123
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