Nano-coupled heterostructure induced excellent mechanical and tribological properties in AlCoCrFeNi high entropy alloy

Authors

Yushan Geng
Hui Tan
Long Wang
Anh Kiet Tieu, University of WollongongFollow
Jiao Chen
Jun Cheng
Jun Yang

RIS ID

145846

Publication Details

Geng, Y., Tan, H., Wang, L., Tieu, A., Chen, J., Cheng, J. & Yang, J. (2021). Nano-coupled heterostructure induced excellent mechanical and tribological properties in AlCoCrFeNi high entropy alloy. Tribology International, 154

Abstract

© 2020 High strength, ductile and wear-resistant alloys are required for engineering applications. This work reports a good combination of mechanical and tribological properties in (NiAl)x(FeCr)yCo(x+y)/2 high-entropy alloys (HEAs) via adjusting A2/B2 nano-coupled heterostructure. The A2/B2 heterostructure switches from weave to network structure by increasing x:y ratio from 1:1.3 to 1:1, and eventually forms an island structure when x:y ratio is 1.3:1. Concurrently, the grain boundary FCC phase transforms from continuous to discontinuous as its fraction decreases. The island-like A2/B2 heterostructure provides (NiAl)1.3(FeCr)Co1.15 HEA a good compressive yield strength of 1.7 GPa and plasticity of 23.4%. Additionally, (NiAl)1.3(FeCr)Co1.15 HEA has the promising wear-resistance from room temperature to 800 °C, ascribing to its excellent strength and the protective tribo-layer at high temperatures.