Understanding the influence of carbon addition on the corrosion behavior and mechanical properties of Al alloy “covetics”

Varnell, Jason A.; Bakir, Mete; DiAscro, Angela M.; Chen, Xinyi; Nilufar, Sabrina; Jasiuk, Iwona; Gewirth, Andrew A.

doi:10.1007/s10853-018-2998-5

Title: Understanding the influence of carbon addition on the corrosion behavior and mechanical properties of Al alloy “covetics”

Journal Article · 15 October 2018 · Journal of Materials Science

DOI: https://doi.org/10.1007/s10853-018-2998-5 · OSTI ID:1607427

Varnell, Jason A. ^[1]; Bakir, Mete ^[2]; DiAscro, Angela M. ^[2]; Chen, Xinyi ^[2]; Nilufar, Sabrina ^[3];

^[2];

^[2]

Univ. of Illinois at Urbana-Champaign, IL (United States); University of Illinois at Urbana-Champaign
Univ. of Illinois at Urbana-Champaign, IL (United States)
Southern Illinois Univ., Carbondale, IL (United States)

The recent invention of a new processing method for metals and alloys involving the addition of carbon has led to several reports demonstrating an enhancement in the mechanical properties of the materials known as covetics. In this work the corrosion behavior and mechanical properties of a 6061 aluminum-carbon covetic are investigated and explained. Covetic samples with carbon added were found to exhibit a corrosion potential 40-70mV higher than samples processed without the addition of carbon. However, the corrosion current density of the covetic with carbon added relative to samples without carbon added was also increased. Surface characterization following the corrosion testing using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction revealed significant differences between the covetic with carbon added and the covetic parent material processed without carbon addition. After corrosion, the surface of the covetic with carbon added showed a alloying element rich surface morphology from the parent alloy and exhibited a smaller grain size than the material processed without carbon. Additionally, changes in the mechanical properties of the covetic were observed with both the hardness and the compressive strength of the covetic increasing as a result of carbon addition. Finally, the observed change in corrosion behavior and mechanical properties of the covetic with carbon added, along with the physical characterization, are consistent with the formation of a secondary phase in the alloy induced by carbon addition during the process used to make the covetic.

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Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: FG02-07ER46453; FG02-07ER46471; SC0015115

OSTI ID:: 1607427

Journal Information:: Journal of Materials Science, Journal Name: Journal of Materials Science Journal Issue: 3 Vol. 54; ISSN 0022-2461

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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