Effects of deformation on layered structure and mechanical properties of Al 2 O 3 /Al composite
Wenchao Shi, Shibo Xue, Beishun Cui, An Chen, Feng Xu, Dongmei GongAbstract
The deformation is used to improve the mechanical properties of aluminum matrix composites. The effect of deformation on the aluminum powder morphology is analyzed. The influence of the flaked aluminum powders on oxygen content is discussed. The mechanical properties of Al 2 O 3 /Al composite are studied. The results show that when subjected to compression deformation during cold pressing and hot forging, the initial spherical aluminum powders can be flaked with the layered structure in meridian section. Ball milling can flake the initial spherical aluminum powders and promote the oxidation degree of aluminum powder. The flaked aluminum powders are stacked with the direction approximate perpendicular to the loading direction in meridian section. The increased broken alumina film can be considered as reinforcement, improving the strength of the Al 2 O 3 /Al composite. Shear deformation can significantly improve the hardness and tensile strength of the Al 2 O 3 /Al composite. The hardness and tensile strengths of the Al 2 O 3 /Al composite prepared by shear deformation with flaked aluminum powders are 92.7 HV and 207.7 MPa, respectively.