A novel L12-strengthened multicomponent Co-rich high-entropy alloy with both high γ ′-solvus temperature and superior high-temperature strength

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

3 Scopus Citations
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Author(s)

  • Z. Y. Ding
  • S. W. Wu
  • J. H. Luan
  • Z. B. Jiao

Detail(s)

Original languageEnglish
Article number113826
Journal / PublicationScripta Materialia
Volume199
Online published11 Mar 2021
Publication statusPublished - 1 Jul 2021

Abstract

A L12-strengthened multicomponent Co-rich high-entropy alloy with superior microstructural stability was developed in this study. High-density cuboidal γ ′ particles were found to embed in the matrix for the alloy subjected to isothermal aging at temperatures ranging from 800 to 1100 °C without the formation of brittle intermetallic phases neither at grain boundaries nor grain interior after long-term thermal exposure. Atom probe analyses indicated that Ta and Nb elements preferentially partitioned to the γ ′ intermetallic phase, which is found to be substantially important for stabilizing the L12 ordered crystalline structure. More importantly, the present alloy exhibited a good combination of both high γ ′-solvus temperature (1125°C) and low mass density (8.28 g cm−3), together with superb high-temperature tensile strength (755 MPa at 800 °C and 664 MPa at 900 °C). The present findings offer an essential paradigm for designing advanced L12-strengthened high-temperature alloys with broader temperature capabilities based on Co.

Research Area(s)

  • Co-rich high-entropy alloy, High-temperature strength, Microstructural stability, Solute partitioning

Citation Format(s)

A novel L12-strengthened multicomponent Co-rich high-entropy alloy with both high γ ′-solvus temperature and superior high-temperature strength. / Cao, B. X.; Kong, H. J.; Ding, Z. Y.; Wu, S. W.; Luan, J. H.; Jiao, Z. B.; Lu, J.; Liu, C. T.; Yang, T.

In: Scripta Materialia, Vol. 199, 113826, 01.07.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review