549 490 1 3 224 181 4 8 65 619 480 2 1 195 147 6 0__________________________________________________________________________ u03c3 tensile strength mpa yp yield strength mpa u03b4 elongation approximately zero unmeasurable blank not measured the test specimens of the aluminum matrix composite materials of example nos 9 to 17 were examined about tensile strength and elongation at room temperature tensile strength and elongation at 150 u00b0 c the test specimens of example nos 16 and 17 were additionally examined about tensile strength yield strength and elongation at 300 u00b0 c the results are shown in table 7 table 7 shows that the aluminum matrix composite materials of example nos 9 to 17 respectively had tensile strength sigma of more than 500 mpa at room temperature and more than 450 mpa at 150 u00b0 c therefore it is apparent that the test specimens of the examples of the present invention had improved heat resisting strength as shown in table 8 the test specimens of comparative example nos 58 to 65 were examined about tensile strength and elongation at room temperature and 150 u00b0 c the test specimens of comparative example nos 60 to 65 were additionally examined about tensile strength yield strength and elongation at 300 u00b0 c comparative example nos 58 59 64 and 65 had the same composition as the matrix composition of the examples of the present invention and had tensile strength sigma of more than 500 mpa at room temperature and more than 450 mpa at 150 u00b0 c the aluminum alloy of comparative example no 58 had the.