Friction-stir welding of a ductile high entropy alloy : microstructural evolution and weld strength

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

2 Scopus Citations
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Author(s)

  • Z. G. Zhu
  • Y. F. Sun
  • F. L. Ng
  • M. H. Goh
  • P. K. Liaw
  • H. Fujii
  • Q. B. Nguyen
  • Y. Xu
  • S.M.L. Nai
  • J. Wei

Detail(s)

Original languageEnglish
Pages (from-to)524-532
Journal / PublicationMaterials Science and Engineering A
Volume711
Early online date16 Nov 2017
StatePublished - 10 Jan 2018

Abstract

High entropy alloys (HEAs) are a novel subset of metallic systems with complex compositions usually yielding simple phase formation. To verify their potential engineering applications, a novel Co16Fe28Ni28Cr28 HEA with a low content of expensive Co was developed and its welding characteristics through friction-stir welding (FSW) were investigated. The HEA shows a stable face-centered-cubic (FCC) structure with an excellent ductility of about 70%. The microstructural evolution during FSW was dominated by discontinuous recrystallization through grain bulging and the B/B¯ {112}<110> shear texture formed in the stir zone (SZ). A white band (WB) containing W-rich and Cr-rich phases was detected in the SZ. The WB exhibited refined grains compared with the normal SZ, which may be associated with the particle-stimulated nucleation (PSN). The present understanding of the microstructural evolution during FSW of HEAs may help tailor the weld properties to pave the way for their engineering applications.

Research Area(s)

  • Friction-stir welding, High entropy alloys, Mechanical properties, Microstructural evolution, Recrystallization

Citation Format(s)

Friction-stir welding of a ductile high entropy alloy : microstructural evolution and weld strength. / Zhu, Z. G.; Sun, Y. F.; Ng, F. L.; Goh, M. H.; Liaw, P. K.; Fujii, H.; Nguyen, Q. B.; Xu, Y.; Shek, C. H.; Nai, S.M.L.; Wei, J.

In: Materials Science and Engineering A, Vol. 711, 10.01.2018, p. 524-532.

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