Effect Of Structure Of High Entropy Crfeconicu Alloys Produced By Eb Pvd On Their Strength And Dissipative Properties
JOURNAL OF ALLOYS AND COMPOUNDS(2021)
摘要
Thin (up to 100 mu m) foils and coatings of high-entropy CrFeCoNiCux (x = 0...3.0) alloys (HEAs) were produced at different temperatures in the 525...1275 K range by electron-beam evaporation of ingots. It is shown that CrFeCoNiCux (where x > 0.3) condensates deposited at a temperature above 925 K have a dual phase structure consisting of two FCC phases, while those deposited at a temperature below this value exhibit a single-FCC structure. It is also found that annealing of the deposited single-phase CrFeCoNiCux (x = 0.3...3.0) condensates at temperatures above 925 K results in the transition into a dual-FCC phase state. Yet, condensates with the copper content x < 0.3 remain stable at heating up to high temperatures (up to 1300 K). The transition from single-phase condensates into dual-phase condensates occurs through the formation of the metastable Cr-enriched phase. The effect of the condensate structure on their mechanical and dissipative properties is considered. The single-phase condensates exhibit increased microhardness, as compared to the cast alloy. The microhardness of the two-phase condensates is lower than in single-phase ones but still higher than in the cast ingot. HEA-based vacuum condensates in both single-phase and twophase states show high values of damping capacity, which are comparable with those of highly damping materials, such as AZ31B-F magnesium alloys. (C) 2021 Elsevier B.V. All rights reserved.
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关键词
High-entropy alloys, Physical vapor deposition, Vacuum condensate, Hardness, Plasticity, Damping capacity
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