Abstract
Abstract The creep resistance of an unreinforced and a particle-reinforced AlSi1MgCu alloy (AA6061) produced by liquid metallurgy was studied by means of conventional tensile creep tests at 300 °C. Dislocation-creep mechanism is attributed to both materials in the range of 15 – 50 MPa. The particlereinforced metal (PRM) exhibits a higher creep rate than the matrix alloy because of the particles acting as dislocation sources and the increase of the apparent diffusion coefficient due to a higher defect density. The apparently smaller creep exponent for the matrix is explained by the overaging of Mg2Si precipitates during longterm tests. Void formation leads to strain localisation in the unreinforced alloy, which is dispersed by the particles reducing the damage rate in the PRM. Subsequently, the time to rupture of the PRM surpasses that of the unreinforced matrix at creep stresses smaller than 10 –3 G (20 MPa).
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