Platinum Metals Rev., 1965, 9, (1), 19
Influence of Purity on the Work-hardening of Platinum
A comprehensive study of the work-hardening, recovery and recrystallisation of three grades of platinum has been reported by Dr Ernst Raub, of the Forschungsinstitut für Edelmetalle (Z. Metallkunde, 1964, 55, (9), 512). Data were obtained for technically pure (<99-5 Percent purity), chemically pure (< 99.9 percent) and physically pure platinum (< 99.99 percent) after various cycles of cold working and annealing.
Physically pure platinum began to recover after heavy cold working at about 200°C, and recovered rapidly at 250°C. The temperature ranges of recovery and recrystallisation were found to rise with increasing impurity content. Strength at elevated temperatures was increased at higher impurity levels, independently of microstructure and grain size.