Implementing high entropy alloy synthesis via friction stir processing: Simultaneous solid-state alloying and ultra-refinement of copper

Abstract

Using the multi-principal element based high entropy alloy (HEA) concept, single-step ultra refinement and solid- state alloying of Cu with NiTi, Y, Fe, Cr, and Co were achieved simultaneously for the first time via friction stir processing (FSP). A bimodal microstructure with an average grain size smaller than 1.5 μ m was attained. The microstructure consisted of inter-dispersed regions of high and low density of geometrically-necessary dislocations. The fraction of high-angle grain boundaries was observed to increase from ~33% in the unstirred region to ~80% in the processed alloy. Intercalated bands having sharp variations in grain size were formed in conjunction with the bimodal microstructure. The entropic stabilization due to addition of diverse elements assisted multi- faceted heterogeneity and grain refinement along. This study paves the way for the development of HEAs via FSP.

Publication
Vacuum, 222(2024)(113042)
Nadeem Fayaz Lone,Dhruv Bajaj,Namrata Gangil,Mustufa Haider Abidi,Daolun Chen,A. Arora,Arshad Noor Siddiquee. “Novel CFD-DEM approach for analyzing spherical and non-spherical shape particles in spouted fluidized bed”. Particulate Science and Technology, 142(2024), 288

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