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KMID : 0362220120390030183
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Journal of The Korean Research Society for Dental Materials
2012 Volume.39 No. 3 p.183 ~ p.190
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Age-Hardenability of Au-Cu-Zn Alloy Containing Pd at Intraoral Temperature
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Lee Gwang-Young
Cho Su-Yoen
Pyo Ae-Ri
Kwon Yong-Hoon
Kim Hyung-Il
Seol Hyo-Joung
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Abstract
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In the present study, the age-hardenability of various Au-Cu-Zn alloys containing Pd at intraoral temperature was evaluated by means of hardness test and X-ray diffraction (XRD) study after solution-treatment at various temperatures and then aging at intraoral temperature. The apparent age-hardenability of Pd-free AuCu-20Zn(at%) alloys (specimen 1) at intraoral temperature resulted from the formation of the AuCu Il ordered phase, and the age-hardenability at intraoral temperature became apparent with increasing solution-treatment temperature. The age-hardenability of the Au-Cu-Zn alloys containing Pd at intraoral temperature decreased with increasing Pd content. The alloys containing 5 at% Pd showed relatively apparent age-hardenability at intraoral temperature, which resulted from the atomic diffusion by the help of quenched in excess vacancies. The low e/a-value (electrons per atom) of Pd was thouhgt to be the reason for the inhibition of the AuCu Il phase formation in the Au-Cu-Zn alloys containing Pd.
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KEYWORD
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Age-hardenability at intraoral temperature, AuCu Il, Solution-treatment, Au-Cu-Zn-Pd
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