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. (C) 2009 Elsevier B.V. All rights reserved.