B₄C/6082Al Composites Fabricated by Cyclic Extrusion and Compression: Microstructure and Mechanical Properties at Different Deformation Temperatures

B 4 C/6082Al neutron absorbing composites with a high B 4 C content of 30 wt% are fabricated by cyclic extrusion and compression (CEC) without prior or post sintering. Bulk composites are prepared directly from B 4 C/6082Al composite powders via deformation‐driven metallurgy based on the principle of severe plastic deformation. The effect of deformation temperature (350, 400, 450, 500, 550, and 600°C) on the fragmentation and dispersion of B 4 C reinforcement, grain properties of the 6082Al matrix, interfacial characteristics, and mechanical properties of the obtained B 4 C/6082Al composites is systematically investigated through scanning electron microscopy, electron backscatter diffraction and tensile tests. The results show that the distribution uniformity of the B 4 C particles and the average grain size of the 6082Al matrix increase with increasing deformation temperature. Composites with a deformation temperature of 550 °C exhibit good comprehensive properties; the tensile strength, hardness, and relative density are ≈278 MPa, 99.2 HB, and 99.6%, respectively. This preparation route demonstrates the capacity to develop aluminum matrix composites with high reinforcement content and excellent mechanical properties.