Age-hardenability and related microstructural changes during and after phase transformation in an Au-Ag-Cu-based dental alloy
AUTOR(ES)
Kim, Hyung-Il, Kim, Tae-Wan, Kim, Young-Oh, Cho, Su-Yeon, Lee, Gwang-Young, Kwon, Yong Hoon, Seol, Hyo-Joung
FONTE
Mat. Res.
DATA DE PUBLICAÇÃO
04/12/2012
RESUMO
The aim of this study was to clarify how the microstructural changes during and after phase transformation determine the age-hardenability of an Au-Ag-Cu-based dental alloy. The rapid increase in hardness in the initial stage was the result of rapid atomic diffusion by spinodal decomposition into metastable Ag-rich' and Cu-rich' phases. The constant hardening after apparent initial hardening was the result of a subsequent transformation of the metastable Ag-rich' and Cu-rich' phases to the stable Ag-rich α1phase and AuCu I phase through the metastable AuCu I' phase. During the increase in hardness, fine block-like structure with high coherency formed in the grain interior, which changed to a fine cross-hatched structure. A relatively coarse lamellar structure composed of Ag-rich α1and AuCu I phases grew from the grain boundaries, initiating softening before the grain interior reached its maximum hardness. As a result, the spinodal decomposition attributed to rapid hardening by forming the fine block-like structure, and the subsequent ordering into AuCu I, which is a famous hardening mechanism, weakened its hardening effect by accelerating the lamellar-forming grain boundary reaction.
Documentos Relacionados
- Microstructural Evolution and Phase Transformation of a Ti-5Nb-5Al Alloy During Annealing Treatment
- Characterization of Phase Transformations and Microstructural Changes in an API 5CT L80 Steel Grade During Ni Alloy Laser Cladding
- Microstructural Characterization of a Laser Surface Remelted Cu-Based Shape Memory Alloy
- Designing a Microstructural Array Associated with Hardness of Dual-phase Cu-Zn Alloy Using Investment Casting
- Microstructural development and tensile strength of an ECAP: deformed Al-4 wt. (%) Cu alloy