Preparation and Properties of High-Toughness AlMgB<sub>14</sub> Material.

Abstract

This study employed a composite method using TiB₂-HfC dual-component additive to prepare AlMgB₁₄ ceramic composite material. The morphology and phase composition of the AlMgB₁₄ ceramic powder were characterized using scanning electron microscopy (SEM) and an X-ray diffractometer (XRD). The phase evolution, microstructure, and mechanical properties of the sintered composite were investigated. The experimental results indicate that the AlMgB₁₄-based composite sintered at 1450 °C exhibited excellent comprehensive properties, with a Vickers hardness of 25.3 GPa, a fracture toughness of 6.9 MPa·m^1/2, a bending strength of 615 MPa, and a density of 3.22 g/cm³. Additionally, a solid solution second phase was observed in the AlMgB₁₄ material. Through a dual-component synergistic composite strategy, this study enhanced the toughness of AlMgB₁₄ material without significantly compromising other properties, providing a new design approach for the development of low-cost, high-performance AlMgB₁₄-based composites.