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Material constants of AlN—graphene composites determined by ultrasound method

The aim of the article is to present the elastic properties of AlN composites with addition of 0 to 8 wt% graphene. The composites were prepared using the hot pressing method. Samples prepared in this way show the anisotropy of elastic properties. All material constants i.e. Young’s modulus shear modulus and Poisson’s ratio of the composite including the anisotropy of its elastic properties were determined by the through-transmission method. This method is based on the measurement of the propagation velocities of appropriately polarized ultrasonic waves in the samples. A full description of the elastic properties of the AlN-graphene composite has been presented. In addition, SEM microstructure observations confirmed and allowed to explain the obtained values of elastic properties of ALN graphene—composites. The conducted research showed a significant influence of the amount of graphene addition on the elastic properties of the composites and the anisotropy of their properties. The highest, up to 55% anisotropy of the Young’s modulus is characterized by composite materials with an 8 wt% graphene content in the AlN composite—graphene. Simultaneously, for composites with 8 wt% graphene content the lowest elastic properties were calculated.