Al-20 wt% Zn samples were obtained at room temperature by rapid cooling from the melt. The quenched samples were aged at different temperatures below and above the transformation temperature (503 K) for 2 h, then quenched to room temperature. Structure variations and changes in internal friction, thermal diffusivity, Young's modulus and resistivity were traced for these testing conditions. The different results were explained in terms of the thermally induced structures in the alloy.
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