Effects of Aging on Nanoindentation Creep of Al-Al2Cu Eutectic Alloy
The evolution of microstructure and nanoindentation creep behaviors of α-Al layer and Al2Cu layer in Al-Al2Cu eutectic alloy after different aging treatments was investigated by X-ray diffractometer and optical microscope.The results reveal that blocky Al2Cu phases are formed in the eutectic alloy after aging at 273℃for different durations,of which the amounts are increased with aging time.After aging at 195℃and 273℃for different durations,the creep stress indexes and thermal activation volumes of α-Al layer and Al2Cu layer are changed,indicating that the deforma-tion resistance of eutectic alloy under high-temperature environment is dominated by Al2Cu layer.
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