Effects of Al2O3 Addition on the Microstructure and Properties of CoCr Alloys

Hong, Q.; Bai, P.; Wang, J. Effects of Al₂O₃ Addition on the Microstructure and Properties of CoCr Alloys. Metals 2019, 9, 1074. Hong, Q.; Bai, P.; Wang, J. Effects of Al2O3 Addition on the Microstructure and Properties of CoCr Alloys. Metals 2019, 9, 1074.

DOI: 10.3390/met9101074

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Abstract

In typical Cobalt-chromium (CoCr) alloys powders, aluminum oxide (Al₂O₃) powder can be added. In the present study, we successfully prepared alloyed samples of various powder ratios by laser cladding, and analyzed their microstructure and carbide structural characteristics, including microhardness, biological properties, morphology (using scanning electron microscopy), and crystal structure (using X-ray powder diffraction). Elemental distribution was also determined by energy-dispersive X-ray spectral analysis. The results showed that Al₂O₃ addition caused the alloy to change from slender columnar crystals to columnar grains similar, to equiaxed grains. In addition, Al₂O₃ agglomeration zones appeared, and carbide structures were altered. The mechanism of the observed performance changes was also analyzed.

Keywords

CoCr alloy; microstructure; powder modified; Al2O3

Subject

MATERIALS SCIENCE, Biomaterials

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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