THERMAL-EXPANSION MEASUREMENTS ON CREEP TESTED MG-PSZ

Thermal expansion measurements made on tension-creep-tested Mg-PSZ sho w the recovery of much of the plastic strain that was induced by the c reep test. The amount of plastic strain recovered on the initial measu rement was found to increase with the time between the tension-creep e xperiment and the initial thermal expansion measurement. Times in exce ss of 100 days caused the recovery of more strain in the thermal expan sion measurement than had initially been induced in the tension-creep test. This aging process was accelerated by heating to 400-degrees-C. These results are in qualitative agreement with an earlier neutron dif fraction measurement.