Correlative chemical and structural investigations of accelerated phase evolution in a nanocrystalline high entropy alloy. (1st July 2020)

• Record Type: Journal Article
• Authors: Li, Y.J.; Kostka, A.; Savan, A.; Ludwig, A.
• Is Part Of: Scripta materialia. Number 183(2020)
• Page Start: 122
• Page End: 126
• Publication Date: 2020-07-01
• Subjects: Atom probe tomography -- Transmission electron microscopy -- Grain boundary segregation -- High entropy alloys -- Phase stability; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.03.016
• Languages: English
• ISSNs: 1359-6462

Abstract

Graphical abstract: Abstract: Based on our recently-developed combinatorial processing platforms for accelerated investigations of phase evolution in multinary alloys, a novel correlative atom probe tomography and transmission electron microscopy approach is proposed to study phase stability in a nanocrystalline CrMnFeCoNi alloy. We observed that the material can decompose at 250 ° C for 5 h or 300 ° C for 1 h, having the same decomposed products as in its coarse-grained counterpart after annealing at 500 ° C for 500 days. A low apparent activation energy for the diffusion of Ni in the nanocrystalline alloy is derived and explains the fast kinetics of phase decomposition in nanocrystalline alloys.