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Fabrication of aluminum borate whisker reinforced AZ91D magnesium alloy composites by semi-solid process and their mechanical properties

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In order to develop a light weight piston for an automobile engine, aluminum borate whisker reinforced AZ91D magnesium alloy composites were fabricated by a semi-solid material process using squeeze casting. By controlling the solid fraction, f s, and the rate of the infiltration into the preform, we succeeded in reinforcing a part of the cast alloy without deformation of the preform. The tensile strength of the alloy/composites interface fabricated by semi-solid (50% f s, solid fraction in the semi-solid slurry) process was 120 MPa, and it was equal to the strength by conventional 0% f s process. However, the flexural strength of the composite by the 50% f s process was about 10% lower than the strength of that from the 0% f s process, 498 MPa. After solid solution and aging treatment, the bending strength of the composites in both 0% and 50% f s process was decreased. This might be caused by the notch effect of Mg2Si compound produced between SiO2 binder of the preform and magnesium during heat treatment.


Document Type: Research Article

DOI: http://dx.doi.org/10.1163/156855101753396735

Publication date: October 1, 2001

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