Physical metallurgy and mechanical properties of transition-metal Laves phase alloys

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

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Author(s)

  • C. T. Liu
  • J. H. Zhu
  • M. P. Brady
  • C. G. McKamey
  • L. M. Pike

Detail(s)

Original languageEnglish
Pages (from-to)1119-1129
Journal / PublicationIntermetallics
Volume8
Issue number9-11
Publication statusPublished - Sep 2000
Externally publishedYes

Abstract

This paper provides a comprehensive review of the recent research on the phase stability, point defects, and fracture toughness of AB2 Laves phases, and on the alloy design of dual-phase alloys based on a soft Cr solid solution reinforced with hard XCr2 second phases (where X = Nb, Ta and Zr). Anti-site defects were detected on both sides of the stoichiometric composition of NbCr2, NbCo2, and NbFe2, while they were observed only on the Co-rich side of ZrCo2. Only thermal vacancies were detected in the Laves phase alloys quenched from high temperatures. The room-temperature fracture toughness cannot be effectively improved by increasing thermal vacancy or reducing stacking fault energy through control of phase stability. Microstructures, mechanical properties, and oxidation resistance of dual-phase alloys based on Cr-NbCr2, Cr-TaCr2, and Cr-ZrCr2 were studied as functions of heat treatment and test temperature at temperatures to 1200 °C. Among the three alloy systems, Cr-TaCr2 alloys possess the best combination of mechanical and metallurgical properties for structural use at elevated temperatures.

Citation Format(s)

Physical metallurgy and mechanical properties of transition-metal Laves phase alloys. / Liu, C. T.; Zhu, J. H.; Brady, M. P.; McKamey, C. G.; Pike, L. M.

In: Intermetallics, Vol. 8, No. 9-11, 09.2000, p. 1119-1129.

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