Aluminum oxide (Al₂O₃) powder can be added to typical cobalt-chromium (CoCr) alloy powders. 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 the microhardness, biological properties, morphology (using scanning electron microscopy), and crystal structure (using X-ray powder diffraction). The elemental distribution was also determined by energy-dispersive X-ray spectroscopy. The results showed that an Al₂O₃ addition caused the alloy microstructure to change from slender columnar crystals to columnar grains that were similar in shape to equiaxed grains. In addition, Al₂O₃ agglomeration zones appeared, and carbide structures were altered. The mechanism of the observed performance changes was also analyzed.

In this work, the interface bonding properties of Al₂O₃/CoCr metal matrix composites were calculated using first principles after Al₂O₃ was added to traditional CoCr alloys. The phase and microstructure of the CoCr alloy and the Al₂O₃/CoCr metal matrix composites were characterized. The results indicate that the interface binding ability of the Al₂O₃ (111)/CoCr (111) interface model was the strongest, and the electronic overlap of its interface was the highest. The charge density was the strongest, the overlap area was the highest, and there was a charge accumulation area at the interface. Meanwhile, the influence of the amount of added Al₂O₃ on the bonding strength of the Al₂O₃/CoCr interface was studied. It was concluded that the interface bonding ability of the Al₂O₃ (111)/CoCr (111) interface was the best when 5% Al₂O₃ was added. By studying the phase composition and microstructure of Al₂O₃/CoCr metal matrix composites, it was shown that the microstructure of the composites was uniform and dense after added Al₂O₃, Al₂O₃, M₆C, and CoAl₂O₄ phases appeared, and the grain size was finer.

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.

In the present study, a finite element-based numerical simulation approach was employed to investigate the temperature field distribution and variations in molten pool dimensions during the selective laser melting (SLM) forming process of Al₂O₃/CoCr metal matrix composites. Building on this foundation, the present work explored the regulatory effects of volumetric energy density (VED) on the performance of SLM-fabricated components. Ultimately, the optimal process parameters for the selective laser melting of Al₂O₃/CoCr metal matrix composites were identified and established. The results show that when the laser power is in the range of 150–250 W and the scanning speed is 700–1100 mm/s, it is beneficial to the SLM forming of Al₂O₃/CoCr metal matrix composites. When the VED is between 133.3 J/mm³ and 171.4 J/mm³, the microstructural defects of the composite are the least. The optimal SLM process parameters are finally determined as follows: laser power 200 W, scanning speed 700 mm/s, scanning line spacing 0.06 mm, and hatch spacing 0.03 mm.