Journal
MATERIALS
Volume 14, Issue 15, Pages -Publisher
MDPI
DOI: 10.3390/ma14154259
Keywords
metals and alloys; 3D printing; oxidation
Categories
Funding
- NATIONAL KEY RESEARCH AND DEVELOPMENT PROGRAM [2019YFB2006500]
- SCIENCE AND TECHNOLOGY INNOVATION PROGRAM OF HUNAN PROVINCE [2020RC2002]
- INNOVATION DRIVEN PROGRAM OF CENTRAL SOUTH UNIVERSITY [2019CX006]
- THE RESEARCH FUND OF THE KEY LABORATORY OF HIGH PERFORMANCE COMPLEX MANUFACTURING
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The oxidation behavior of a 3D laser printed equimolar Cr-Mn-Fe-Co high-entropy alloy was studied at high temperatures, showing that the oxidation kinetics followed parabolic rate law and the oxide layer thickness increased with experimental temperature or time. Exfoliation of the oxide layer occurred at 900 degrees C. The loose structures formed during oxidation tests significantly affected the high-temperature oxidation resistance of the HEA.
The oxidation behavior of an equimolar Cr-Mn-Fe-Co high-entropy alloy (HEA) processed by 3D laser printing was investigated at 700 degrees C and 900 degrees C. The oxidation kinetics of the alloy followed the parabolic rate law, and the oxidation rate constant increased with the rising of the temperature. Inward diffusion of oxygen and outward diffusion of cations took place during the high-temperature oxidation process. A spinel-type oxide was formed on the surface, and the thickness of the oxide layer increased with the rising of experimental temperature or time. The exfoliation of the oxide layer took place when the test was operated at 900 degrees C over 12 h. During oxidation tests, the matrix was propped open by oxides and was segmented into small pieces. The formation of loose structures had great effects on the high-temperature oxidation resistance of the HEA.
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