Abstract
Several copper-gold alloys, with compositions of between 10 and 80 atomic percent of gold, were examined by quantitative DTA from 25 to 500°C. The results are in good agreement with those obtained by other less rapid, but more accurate, methods. All the reactions observed were first-order transformations. A latent heat (180 ± 40 cal g-at −1) was measured at 405°C for the α″ I → α″ II transformation of the alloy containing 50% of gold. An endothermic effect, corresponding to an order—disorder reaction, was detected for all alloys, up to a composition of over 90 atomic percent of gold.
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