VARIATIONS OF ELASTIC-MODULI DURING AGING PROCESS OF AL-LI SOLID-SOLUTIONS TREATED AT HIGH-PRESSURE

Supersaturated Al-10 and 15 mol% Li solid solutions were prepared by m eans of heat treatments under high pressure and high temperature, and the variations of elastic modulus, electrical resistivity and micro-Vi cker's hardness in these solid solutions during isochronal ageing up t o 673 K were investigated. The maximum shear modulus was observed duri ng the precipitation of the delta' phase at 453 K ageing, The differen ce in the decomposition behaviour of several specimens obtained by hig h-pressure solid solutioning and the conventional one is discussed bas ed on the results of elastic moduli measurements.