A eutectic high-entropy alloy with good high-temperature strength-plasticity balance. Issue 11 (2nd November 2019)

• Record Type: Journal Article
• Authors: Han, Liuliu; Xu, Xiandong; Wang, Li; Pyczak, Florian; Zhou, Rui; Liu, Yong
• Is Part Of: Materials research letters. Volume 7:Issue 11(2019)
• Page Start: 460
• Page End: 466
• Publication Date: 2019-11-02
• Subjects: Eutectic high-entropy alloy -- compression behavior -- strain hardening -- strength-plasticity balance; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2019.1650130
• Languages: English
• ISSNs: 2166-3831

Abstract

ABSTRACT: We developed a eutectic high-entropy alloy (EHEA) with appreciable high-temperature strength-plasticity balance. Structural characterizations of the as-cast sample revealed a lamellar structure with austenite (face-centered-cubic, FCC) and Laves phases. Upon annealing at 873 K, precipitation of nanoscale (Ni, Al, and Zr)-rich L12 phase from the FCC phase took place, which eventually transformed into a martensitic (hexagonal, ε ) phase with rearrangement of atomic species. Compressive properties revealed a brittle behavior at temperatures below 873 K, but changed to a ductile behavior with considerable strain hardening at 973 K, due to the formation of a high density of deformation twins observed by transmission electron microscopy. GRAPHICAL ABSTRACT: IMPACT STATEMENT: A eutectic high-entropy alloy with attractive high-temperature compressive strength-plasticity balance was realized by tuning the microstructure via heat treatment, during which nanoscale L12 phase formed within the FCC matrix phase.