Abstract
Low temperature ageing at 37° C in an equiatomic CuAu alloy and several Cu-Au-Pd ternary alloys in the CuAu-Cu0.6Pd0.4 pseudobinary system was studied. Age-hardening and a decrease in electrical resistivity were observed in the CuAu alloy and Cu-Au-Pd ternary alloys containing palladium up to 11 at. %. These phenomena were caused by the progress of long-range ordering in the CuAu l type superstructure with the aid of quenched-in excess vacancies. The rate of low temperature ageing decreased with increasing palladium concentration. This was presumed to be due to the increase in migration energy of a quenched-in vacancy with the palladium concentration.
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