Paper number 392


P. Prader , H.P. Degischer

1Institute of Materials Science and Testing, Vienna University of Technology
Karlsplatz 13, A-1040 Vienna, Austria

Summary The thermal cycling creep behavior of the aluminium alloy 6061 reinforced by 10 vol.-% Al2O3-particles and its dependence on the applied mechanical creep load was analyzed with respect to different heat treatment conditions. The specimens were thermally cycled between room temperature and 300C. It was found that a stabilizing aging of the composite at 300C increases the lifetime significantly at an initial stress of 40 MPa but reduces the cycles to failure tremendously at 80 MPa. Void formation at particles, promoted by internal and external stresses, and their transverse linkage was the main failure mechanism.
Keywords particle reinforced aluminium, thermal cycling creep, lifetime, void formation, aging condition.

Theme : Metal Matrix Composites ; Thermo-mechanical behaviour

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