アルミニウム合金基ハイブリッド複合材料の組織と機械的性質

抄録

  Hybrid composites, in which particles were distributed among continuous fibers, were prepared by the squeeze casting process. Aluminum alloy of AC1B was used as the matrix metal, and Al₂O₃ continuous fibers and Al₂O₃ particles as reinforcements. Their microstructures and mechanical properties were investigated and the effects of the introduction of particles were focused. The introduction of particles minimized preform contraction and fiber-to-fiber contact caused by squeeze casting. There were few reaction products at the interfaces between fiber and matrix. The longitudinal tensile strength of the composite increased with increasing fiber volume fraction, and further improved with the introduction of particles. The transverse tensile strength of the hybrid composites was approximately the same as that of the matrix alloy, while that of composites without particles decreased with increasing fiber volume fraction. Transverse tensile fracture mainly occured at the fiber-matrix interface for composites without particles, but occured in the matrix for hybrid composites.