Analyzing the 'non-equilibrium state' of grain boundaries in additively manufactured high-entropy CoCrFeMnNi alloy using tracer diffusion measurements
- Title
- Analyzing the 'non-equilibrium state' of grain boundaries in additively manufactured high-entropy CoCrFeMnNi alloy using tracer diffusion measurements
- Author
- 박주현
- Keywords
- High-entropy alloys; Additive manufacturing; Grain boundary diffusion; Non-equilibrium defects; Anisotropy
- Issue Date
- 2020-12
- Publisher
- ELSEVIER SCIENCE SA
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v. 844, Article no. 155757, 10pp
- Abstract
- Additively manufactured (AM) metallic materials contain typically numerous grown-in defects which limit durability and mechanical properties of workpieces. However, the existence and impact of non-equilibrium vacancies and dislocations and especially the state of grain boundaries in AM materials remained completely unexplored. Here we are presenting an ultimate proof of a 'non-equilibrium state' of general high-angle grain boundaries in an as-produced AM high-entropy CoCrFeMnNi alloy. A low-temperature annealing treatment relaxes the 'non-equilibrium' grain boundary state without invoking grain growth. The 'non-equilibrium' state of grain boundaries in AM materials resembles that in severely plastically deformed ones and needs to be taken into account for technological applications. We further report a strong microstructure-induced anisotropy of grain boundary kinetic properties in the AM high-entropy alloy. (c) 2020 Elsevier B.V. All rights reserved.
- URI
- https://www.sciencedirect.com/science/article/pii/S0925838820321216https://repository.hanyang.ac.kr/handle/20.500.11754/165071
- ISSN
- 0925-8388
- DOI
- 10.1016/j.jallcom.2020.155757
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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