[Studies on the dental gold-alloys (14). Effect of platinum addition on the AuCu-transformation by means of x-ray diffraction analysis (author's transl)].

X-ray diffraction studies were carried out so as to investigate the effects of 0.33-6.90 at. % additions of platinum on the ordering process of AuCu alloy. The stable existing temperature range of AuCu I was extended to higher temperature by the addition of platinum to stoichiometric gold-copper alloy, the ordering rate in these alloys were slower than that of binary AuCu. Changes in diffraction patterns showed a different sequence in ordering process at higher and lower temperature range. Orthorhombic AuCu II was only found in the alloy containing 0.33 at.% Pt at around 410 degrees C.