Age-hardening by metastable phases in an experimental Au-Ag-Cu-Pd alloy

被引：0
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作者：
Lee, Jae-Ho [1 ]
Yi, Sang-Joon [1 ]
Seol, Hyo-Joung [1 ]
Kwon, Yong Hoon [1 ]
Lee, Jai-Bong [2 ]
Kim, Hyung-Il [1 ]
机构：
[1] Department of Dental Materials, College of Dentistry, Medical Research Institute, 1-10 Ami-dong, Seo-gu, Pusan, 602-739, Korea, Republic of
[2] Department of Prosthodontics, College of Dentistry, Seoul National University, 28 Yeongeon-dong, Jongno-gu, Seoul, 110-744, Korea, Republic of
来源：
Journal of Alloys and Compounds | 2006年 / 425卷 / 1-2期
关键词：
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. © 2006 Elsevier B.V. All rights reserved;
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