Effect of Cr content on precipitation behavior of (CoCrNi)94Ti3Al3 medium entropy alloys. (May 2021)

• Record Type: Journal Article
• Authors: Bai, Xi; Fang, Wei; lv, Jiwei; Chang, Ruobin; Yu, Haoyang; Yan, Jiaohui; Zhang, Xin; Yin, Fuxing
• Is Part Of: Intermetallics. Volume 132(2021)
• Publication Date: 2021-05
• Subjects: Medium entropy alloys -- High entropy alloys -- Chromium addition -- Precipitation behavior -- Coarsening kinetics -- Hardness response; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2021.107125
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: The L12 nanoparticles-enhanced alloys have huge potential in high temperature applications. In this study, the effects of Cr content on precipitation behaviors of (CoCrNi)94 Ti3 Al3 medium entropy alloys are investigated. The results indicate the fraction of L12 phase increases with the rising Cr content, meanwhile, the size and coarsening rate of L12 phase decrease, which suppresses the overaged degradation of hardness. The Cr concentration gradient between L12 phase and FCC phase plays an important role in the coarsening process. It is instructive to obtain exceptional nanostructure stability of L12 phase in precipitation-strengthened high entropy alloys via compositional optimization of base elements. Highlights: Number density of precipitates increases with the increase of Cr. The coarsening rate of L12 phase gradually decreases with the increase of Cr. The overaged degradation of hardness is suppressed by Cr additions. The Cr concentration gradient between L12 and FCC phase was detected. Base element Cr plays an important role in the coarsening process.