S-Space College of Dentistry/School of Dentistry (치과대학/치의학대학원) Dept. of Dentistry (치의학과) Journal Papers (저널논문_치의학과)
Age-hardening by metastable phases in an experimental Au–Ag–Cu–Pd alloy
- Lee, Jae-Ho; Yi, Sang-Joon; Seol, Hyo-Joung; Kwon, Yong Hoon; Lee, Jai-Bong; Kim, Hyung-Il
- Issue Date
- Journal of Alloys and Compounds 425 (2006) 210–215
- The age-hardening mechanism and phase transformation during the age-hardening process were examined for a low carat gold alloy with a composition of 30 wt.% Au–30 wt.% Ag–20 wt.% Cu–20 wt.% Pd. By aging the solution-treated specimen, the fcc α0 phase was transformed into the Au-containing Ag-rich phase and the Pd-containing AuCu I phase through the metastable state. The phase transformation of the α0 phase into the metastable Ag-rich α′1 and AuCu I′ phases caused the apparent hardness increase. And the phase transformation of the Ag-rich α′1 and AuCu I′ phases into the Ag-rich α1 and AuCu I phases, caused the hardness decrease. The hardness increase in the early stage of the age-hardening process seemed to be caused by an introduction of the coherency strains at the interface between the metastable Ag-rich α′1 and AuCu I′ phases during the phase transformation of α0 into Ag-rich α′1 and AuCu I′. In the later stage of aging process, the alternative lamellar structure composed of the Au-containing Ag-rich phase and the Pd-containing AuCu I phase grew from the grain boundary consuming the Ag-rich α′1 and AuCu I′ phases in the grain interior, which caused the hardness decrease by releasing the coherency strains.
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