Equicohesive temperature of the interface and matrix and its effect on the tensile plasticity of Al₁₈B₄O₃₃ whiskers reinforced aluminum composite at elevated temperatures

A pure aluminum composite reinforced by Al₁₈B₄O₃₃ whiskers was fabricated by a squeeze casting technique. In the present study, it is found that the dependence of tensile plasticity on temperature in Al₁₈B₄O₃₃ whiskers reinforced aluminum composite is different from other discontinuously reinforced aluminum composites. The tensile elongation to fracture of the composite obtains its maximum value at about 573 K, which is considered to be related to the equicohesive temperature of interface and matrix. This will also establish a basis for the research of hot forming process of the composite at elevated temperatures.