An Al-Si-Cu microcrystalline hypereutectic alloy has been studied by the microindentation method. The possibility has been shown of optimizing the superplastic deformation temperature regimes in the Al-Si-Cu microcrystalline alloy on the basis of the results obtained by the microindentation method. The temperature range (500-550 °C) has been determined where all CuAl2 dispersed particles (blocking grain boundary sliding which is necessary for superplastic flow development) are dissolved. In the temperature range 500-520 °C, record values of elongation-to-failure of about 800% for Al-Si- Cu alloys have been observed.
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