Abstract
The phase transformation associated with hardening in a low carat gold alloy for porcelain bonding during continuous heating was studied by resistivity measurements, hardness tests, X-ray diffraction and scanning and transmission electron microscopies. A short-range order structure, based on Au-Pd, was produced at a lower temperature. At an elevated temperature, two types of precipitation were observed. One is a nodular reaction consisting of an L12 ordered structure based on Pd3Sn and a disordered FCC structure at grain boundary. The other is a formation of spherical L12 ordered precipitates based on Pd3Sn within the grain followed by Ostwald ripening. A fine dispersed precipitate of the latter contributed to the remarkable hardening.
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Hisatsune, K., Tanaka, Y., Tani, T. et al. Phase transformation behaviour of a low carat gold alloy for porcelain bonding during continuous heating. J Mater Sci: Mater Med 3, 54–58 (1992). https://doi.org/10.1007/BF00702945
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DOI: https://doi.org/10.1007/BF00702945