| Summary: | A novelty Al matrix composite reinforced with Cr3 C2 particles was prepared by an ultrasound vibration treatment-assisted casting process. The Cr3 C2 content on the microstructure and mechanical properties of Cr3 C2p /Al composite were researched systematically. The results indicated that Cr3 C2 particles were effectively distributed around the grain boundary and led to a great reduction in crystalline size. The density, porosity, and Vickers hardness of the composites rose simultaneously with the increase of Cr3 C2 content. Meanwhile, the tensile strength and yield strength increased by 104.5% and 85.7%, respectively by adding 3.0 wt. % Cr3 C2. The fracture morphologies showed that the fracture mechanism was plastic fracture for the pure Al and gradually transformed to brittle fracture as the content of Cr3 C2 exceeded 3.0 wt. %. Moreover, the strengthening mechanism of the composite was also discussed. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
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