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

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

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)524-532
Number of pages9
JournalMaterials Science and Engineering A
Issue numberJanuary
Publication statusPublished - 10 Jan 2018
Externally publishedYes


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