Micro-to-nano-scale deformation mechanism of a Ti-based dendritic-ultrafine eutectic alloy exhibiting large tensile ductility

Okulov, I.V.; Boenisch, M.; Volegov, A.S.; Shakur Shahabi, H.; Wendrock, H.; Gemming, T.; Eckert, J.

Journalpaper

Micro-to-nano-scale deformation mechanism of a Ti-based dendritic-ultrafine eutectic alloy exhibiting large tensile ductility

Abstract

Deformation mechanism of a new Ti-16.6Nb-6Co-5.1Cu-6.5Al (at%) alloy is studied using scanning and transmission electron microscopy. The alloy consists of micrometer-sized β-Ti dendrites and an ultrafine-eutectic composed of β-Ti and TiCo phases. The yield strength of the alloy (1.1 GPa) is comparable to that of the metallic glass composites and is coupled with large tensile ductility of about 11%. Transmission electron microscopy analysis reveals that slip lines formed during deformation in the dendrites penetrates the eutectic resulting in formation of a stepped interface and an extra area serving to accommodate shear strains. The β-Ti eutectic component can deform plastically to a high degree supporting deformation of TiCo. The results suggest that microstructural design of the eutectic is important for controlling tensile ductility of dendritic-ultrafine eutectic alloys.

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URL: https://publications.hereon.de/id/34483/
Authors:Okulov, I.V., Boenisch, M., Volegov, A.S., Shakur Shahabi, H., Wendrock, H., Gemming, T., Eckert, J.
Year:2017
In: Materials Science and Engineering A
Volume:682
Pages:673 - 678
Publisher:Elsevier
Type:Journalpaper
ISSN: 0921-5093
Cite as: Okulov, I.V.; Boenisch, M.; Volegov, A.S.; Shakur Shahabi, H.; Wendrock, H.; Gemming, T.; Eckert, J.: Micro-to-nano-scale deformation mechanism of a Ti-based dendritic-ultrafine eutectic alloy exhibiting large tensile ductility. In: Materials Science and Engineering A. Vol. 682 (2017) 673 - 678. (DOI: 10.1016/j.msea.2016.11.082)