Coherent precipitation and stability of cuboidal nanoparticles in body-centered-cubic Al0.4Nb0.5Ta0.5TiZr0.8 refractory high entropy alloy. (1st January 2021)

• Record Type: Journal Article
• Authors: Wang, Qing; Han, Jincan; Liu, Yufeng; Zhang, Zhongwei; Dong, Chuang; Liaw, Peter K.
• Is Part Of: Scripta materialia. Number 190(2021)
• Page Start: 40
• Page End: 45
• Publication Date: 2021-01-01
• Subjects: High entropy alloy -- Precipitation -- Microstructure -- Phase transformation -- Aging; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.08.029
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The present work developed a new body-centered-cubic (BCC)-based Al0.4 Nb0.5 Ta0.5 TiZr0.8 refractory high entropy alloy with coherent precipitation. The formation of cuboidal nanoprecipitates with a size of 25~50 nm in an 873 K-aged alloy is ascribed to a moderate lattice misfit. A Zr5 Al3 phase also coexists with B2 in a same particle shape due to similar chemical compositions, in which Ti is enriched in B2 but not in Zr5 Al3 . The BCC/B2 coherency would be deteriorated with increasing the aging temperature, leaving coarse Zr5 Al3 alone. Besides, there exist two kinds of BCC phases due to the segregations of Nb/Ta and Ti/Zr. Graphical abstract: Image, graphical abstract