X-ray diffraction studies of several proprietary dental gold alloys demonstrated that hardening probably is a dual mechanism of precipitation and order-hardening. Lattice parameter measurements showed that the ordered structure was AuCu. In addition, it was shown that maximum hardness occurs at about 75% full order.
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References
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Harker, D.: Order Hardening: Its Mechanism and Recognition, Trans American Society for Metals32:210-234, 1944.
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Skinner, E.W. , and Phillips, R.W.: The Science of Dental Materials , 6th ed, Philadelphia : W. B. Saunders Co., 1967, p 285.
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Peyton, F.A. ; Asgar, K.; Charbeneau, G.T.; Craig, R.G.; and Myers, G.E.: Restorative Dental Materials, 3rd ed, St. Louis: C. V. Mosby Co., 1968 , p 287.
