期刊
COATINGS
卷 10, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/coatings10010060
关键词
high entropy alloy; in-situ TEM annealing; thermal stability; diffusionless transformation; planar disorder; oxide formation
资金
- Hungarian National Research, Development and Innovation Office through the OTKA [NN112156]
In-situ TEM-heating study of the microstructural evolution of CrFeCoNiCu high entropy alloy (HEA) thin films was carried out and morphological and phase changes were recorded. Post annealing investigation of the samples was carried out by high resolution electron microscopy and EDS measurements. The film is structurally and morphologically stable single phase FCC HEA up to 400 degrees C. At 450 degrees C the formation of a BCC phase was observed, however, the morphology of the film remained unchanged. This type of transformation is attributed to diffusionless processes (martensitic or massive). From 550 degrees C fast morphological and structural changes occur, controlled by volume diffusion processes. Fast growing of a new intermetallic phase is observed which contains mainly Cr and has large unit cell due to chemical ordering of components in direction. The surface of the films gets covered with a CrO-type layer, possibly contributing to corrosion resistance of these.
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