Mixing entropy threshold for entropy-tailored materials. (March 2022)

• Record Type: Journal Article
• Authors: Wang, Jie; Tang, Yu; Li, Shun; Zhang, Zhouran; Ye, Yicong; Zhu, Li'an; Bai, Shuxin
• Is Part Of: Intermetallics. Volume 142(2022)
• Publication Date: 2022-03
• Subjects: High–entropy alloys -- Microstructure -- Phase stability -- Prediction -- Entropy-tailored materials -- Ti–Zr–Nb–V; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2021.107436
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: To determine the effect of mixing entropy on multicomponent alloys and to find the mixing entropy threshold for entropy-tailored materials, including high-entropy alloys and medium-entropy alloys, the microstructure and mechanical properties of 23 Ti–Zr–Nb–V alloys were investigated. The Laves phase content of Ti–Zr–Nb–V alloys was obtained using image recognition technology. According to the component threshold for Laves phases and HCP phase disappearance, V(Nb)–Zr(Ti) pseudo-binary phase diagrams, which can predict the phases of ternary Ti–Zr–V and Zr–Nb–V alloys, were established. By comparing the Laves phase content in Ti–Zr–Nb–V alloys obtained from experimental statistics, pseudo-binary phase diagrams and thermodynamic calculations, the Δ S mix threshold for entropy-tailored materials was 1.10–1.21R. The dependence of the yield strength and fracture strain of the Ti–Zr–Nb–V alloys further reveals that the mechanical properties of entropy-tailored alloys are essentially controlled by Δ S mix . Graphical abstract: Image 1 Highlights: The concept "entropy-tailored materials" unifying "high-entropy alloys" and "medium-entropy" alloys was proposed firstly. Mixing entropy threshold was acquired by comparing the Laves phase contents by prediction and experiment. The phase contents of 23 alloys in Ti–Zr–Nb–V system were examined by image recognition technology. The mechanical properties of entropy-tailored materials are directly dependent on their mixing entropy.