Phase transformation and microstructural changes during ageing process of an Ag-Pd-Cu-Au alloy

被引：0
|
作者：
Yu, Chin-Ho [1 ]
Park, Mi-Gyoung [1 ]
Kwon, Yong Hoon [1 ]
Seol, Hyo-Joung [1 ]
Kim, Hyung-Il [1 ]
机构：
[1] Department of Dental Materials, School of Dentistry, Medical Research Institute, 1-10 Ami-dong, Seo-gu, Pusan, 602-739, Korea, Republic of
来源：
Journal of Alloys and Compounds | 2008年 / 460卷 / 1-2期
关键词：
Age-hardening behaviour and the related phase transformation and microstructural changes during isothermal ageing process were studied to elucidate the age-hardening mechanism of an Ag-based dental casting alloy composed of Ag-Pd-Cu-Au-Zn; Ir and In by means of hardness test; X-ray diffraction (XRD); scanning electron microscopic (SEM) observations and energy dispersive spectroscopic microanalysis (EDS). In the hardness test at 350 and 400 °C; the hardness of the solution-treated specimen began to increase and reached a maximum value with increasing ageing time; and subsequently the hardness decreased gradually. By considering XRD results and SEM observations together; the solution-treated specimen consisted of three phases; the Ag-rich α1 phase as a matrix; the Cu-Pd α2 phase and the CuPd β phase with a CsCl-type as particle-like structures. By ageing the solution-treated specimen; the Ag-rich α1 and Cu-Pd α2 phases were transformed into the Ag-rich α′1 and Cu3Pd α′2 phases; respectively. The CuPd β phase with a CsCl-type was not changed apparently during the ageing process. From the results of the hardness test; XRD study; SEM observations and EDS analysis; it could be derived that the hardness increased by the diffusion and precipitation of the Cu-rich phase from the Ag-rich matrix during the early stage of phase transformation of α1 into α′1 and that the progress of coarsening of the Cu-rich precipitates with an entanglement structure caused the hardness decrease during the later stage of phase transformation of α1 into α′1. The particle-like structures composed of the Cu-Pd α2 and the CuPd β phase with a CsCl-type contributed little to the hardness increase which occurred in the early stage of aging process. © 2007 Elsevier B.V. All rights reserved;
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