High-entropy intermetallic compound with ultra-high strength and thermal stability. (15th March 2021)

• Record Type: Journal Article
• Authors: Yao, Kunda; Liu, Liang; Ren, Jie; Guo, Yong; Liu, Yanfang; Cao, Yang; Feng, Rui; Wu, Fufa; Qi, Jingang; Luo, Jian; Liaw, Peter K.; Chen, Wen
• Is Part Of: Scripta materialia. Number 194(2021)
• Publication Date: 2021-03-15
• Subjects: High-entropy alloy -- Intermetallic compound -- Thermal stability -- Mechanical property -- Phase formation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.113674
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The current research of high-entropy alloys (HEAs) is mainly focused on simple solid-solution alloys or alloys with precipitation strengthening phases. In the present work, we developed a series of high-entropy intermetallic compounds (HEICs). In particular, the multi-principal element Fe0.75 Co0.75 Ni0.75 Cu0.75 TiZrHf with B2 ordering shows an ultrahigh compressive yield strength of 2.25 GPa and a fracture strength of 2.52 GPa. The developed HEIC also demonstrates exceptional high-temperature phase stability with retained yield strengths up to 905 MPa and 705 MPa at 800 °C and 900 °C, respectively. The underlying phase formation rule of the HEICs is discussed within the framework of a proposed electronegativity related parameter combined with the atomic size dispersity. Our study broadens the family of high-entropy materials and provides a new perspective for the high-temperature alloy design based on multi-principal element intermetallics. Graphical abstract: Image, graphical abstract