Yun Zou, Rongxin Liao, Rongtao Shen, Zhihua Liu, Yang Li
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Investigating deformation mechanisms of (FeCoNiCr)92Ti3.5Al4.5 HEA treated by ultrasonic nanocrystal surface modification
High-entropy alloys (HEAs) are known for their unique characteristics, but most material failures are subjected to the material surface, which is determined by the surface properties of the material. This study proposes an effective ultrasonic nanocrystal surface modification (UNSM) treatment to further enhance the surface mechanical properties of (FeCoNiCr)92Ti3.5Al4.5 HEA. More importantly, the deformation mechanisms of HEA treated by UNSM were revealed. Our research revealed that dislocation slip predominantly governs the deformation of coarse grains under low strain, with {100}< 001 > acting as the primary slip system. Conversely, twinning emerges as the primary deformation mechanism for fine grains under high strain. Notably, the refinement of coarse grains is particularly pronounced during the initial stages of deformation.
期刊介绍:
The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.