| The stress-rupture properties and fatigue behavior of Al-10wt.%Ti alloy, which has been produced by mechanical alloying, followed by hot extrusion, were investigated. Creep strength of MA Al10wt.%Ti and MA Al-0wt.Ti alloys at 300℃ were two and three times as much as that of conventional precipitation-hardened Al alloys, because dislocation mobility was reduced effectively by the presence of thermally stable dispersoids. The creep mechanism of MA Al-10wt.%Ti is considered to be primarily controlled by deformation between dispersoids and grain boundary dislocations in the grain boundary. Room temperature fatigue strength of MA Al-10wt.%Ti alloy was similar to that of Al 7075 but superior to Al 2024. As the temperature increased from room temp. to 300℃, 400℃, the fatigue ratio decreased from 0.36 to 0.3 and 0.27, respectively, and the number of crack initiation at the surface and secondary crack were increased. |
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