Off-stoichiometry-guided design of high-strength chemically complex intermetallic-based alloys with outstanding ductility

Bo Xiao; Jixun Zhang; Shaofei Liu; Yilu Zhao; Lianyong Xu; C. T. Liu; Tao Yang

doi:10.1016/j.jmst.2023.02.033

Author(s)

Bo Xiao
Yilu Zhao
Lianyong Xu

Related Research Unit(s)

Detail(s)

Original language	English
Pages (from-to)	28-33
Journal / Publication	Journal of Materials Science and Technology
Volume	160
Online published	6 Apr 2023
Publication status	Published - 10 Oct 2023

Link(s)

DOI	DOI https://doi.org/10.1016/j.jmst.2023.02.033 Final Published version
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Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85153210105&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(66ed74d8-ec52-4ee3-a7f5-ce695e2f1b96).html

Abstract

Chemically complex intermetallic alloys (CCIMAs) have gained particular interest because of their attractive physical and mechanical properties. However, the CCIMAs based on the strict alloying stoichiometry often show serious brittleness with very low ductility at ambient temperature, which seriously hinders their practical use in engineering applications. Here we demonstrate an off-stoichiometry strategy to achieve large tensile plasticity (-30%) together with an ultrahigh tensile strength (-1.4 GPa) in a novel Co_39.3Ni_39.6Al_13.8Ti_3.1Ta_2.8Nb_1.4 (at.%) CCIMA system. Such an ultrahigh strength is primarily ascribed to the high anti-phase boundary energy via multiple alloying additions (i.e., Ti, Ta, and Nb). Simultaneously, the nanoscale disordered phases at grain boundaries (GBs) can efficiently enhance dislocation mobilities and plastic deformation compatibility, thus resulting in a large ductility. The off-stoichiometry strategy provides an effective avenue for the innovation of ultra-strong yet ductile multicomponent intermetallic-based alloys.

© 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

Research Area(s)

Anti-phase boundary energy, Chemically complex intermetallic alloys, Mechanical behavior, Microstructure, Nanoscale disordered phase, Off-stoichiometry

Citation Format(s)

[ RIS ] [ BibTeX ]

Off-stoichiometry-guided design of high-strength chemically complex intermetallic-based alloys with outstanding ductility. / Xiao, Bo; Zhang, Jixun ; Liu, Shaofei et al.
In: Journal of Materials Science and Technology, Vol. 160, 10.10.2023, p. 28-33.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

Xiao, B, Zhang, J , Liu, S, Zhao, Y, Xu, L, Liu, CT & Yang, T 2023, 'Off-stoichiometry-guided design of high-strength chemically complex intermetallic-based alloys with outstanding ductility', Journal of Materials Science and Technology, vol. 160, pp. 28-33. https://doi.org/10.1016/j.jmst.2023.02.033

Xiao, B., Zhang, J., Liu, S., Zhao, Y., Xu, L., Liu, C. T., & Yang, T. (2023). Off-stoichiometry-guided design of high-strength chemically complex intermetallic-based alloys with outstanding ductility. Journal of Materials Science and Technology, 160, 28-33. https://doi.org/10.1016/j.jmst.2023.02.033

Xiao B, Zhang J , Liu S, Zhao Y, Xu L, Liu CT et al. Off-stoichiometry-guided design of high-strength chemically complex intermetallic-based alloys with outstanding ductility. Journal of Materials Science and Technology. 2023 Oct 10;160:28-33. Epub 2023 Apr 6. doi: 10.1016/j.jmst.2023.02.033

Xiao, Bo ; Zhang, Jixun ; Liu, Shaofei et al. / Off-stoichiometry-guided design of high-strength chemically complex intermetallic-based alloys with outstanding ductility. In: Journal of Materials Science and Technology. 2023 ; Vol. 160. pp. 28-33.