Long-term tensile creep behavior of a family of FCC-structured multi-component equiatomic solid solution alloys. (15th April 2022)

• Record Type: Journal Article
• Authors: Xie, Di; Feng, Rui; Liaw, Peter K.; Bei, Hongbin; Gao, Yanfei
• Is Part Of: Scripta materialia. Number 212(2022)
• Publication Date: 2022-04-15
• Subjects: Creep deformation -- Creep lifetime -- Dislocation climb -- Multicomponent equiatomic solid solution alloy; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.114556
• Languages: English
• ISSNs: 1359-6462

Abstract

Highlights: The creep resistance is the highest in CoCrNi, followed by CoCrFeMnNi and then CoCrFeN alloys, while the Monkman-Grant relationship gives similar failure strain. While the room and cryogenic temperature strength is governed by solid solution effects, the contrast of creep behavior in these subset alloys is primarily governed by the stacking fault energy. The best performing CoCrNi has comparable creep resistance as commonly used precipitate/martensite-strengthened ferritic alloys. Abstract: Long-term tensile creep experiments were performed at 973 K on a family of multicomponent equiatomic solid solution alloys with face-centered cubic crystal structures, including quinary CoCrFeMnNi alloy and quaternary CoCrFeNi alloy, together with our previous report on ternary CoCrNi alloy. Analyzing the steady-state and transient creep properties and characterizing the precipitate evolution, it is suggested that dislocation creep be the dominant deformation mechanism for all these alloys. Although CoCrNi shows the highest room-temperature strength and the lowest creep rate at 973 K, the creep lifetime data for all three alloys are similar and can be described by the Monkman-Grant relationship. Graphical abstract: Image, graphical abstract