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Age-hardenability related to precipitation and lamellar-forming grain boundary reaction in dental low-carat gold alloy

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Veröffentlicht/Copyright: 16. August 2013
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 104 Heft 6

Abstract

A dental Ag–Au–Cu–Pd alloy with small amounts of Zn and Ir was examined to determine the association of the age-hardenability with the phase transformation process and microstructural changes by means of hardness testing, X-ray diffraction study, field emission scanning electron microscopic observation and energy dispersive spectrometry. The fast and apparent age-hardenability of the present alloy was possibly attributed to phase separation by spinodal decomposition and the formation of a fine and coherent cuboidal structure composed of the Ag–Au-rich α1 phase and the metastable Cu–Au-rich α2′ phase. The lamellar-forming grain boundary reaction was induced by internal strain before the maximum hardness value was obtained. Moreover, growth of the grain boundary lamellar structure toward the grain interior and its coarsening acted as a strain-releasing softening mechanism, which caused a decrease in age-hardenability. A change in Ag and Pd content might alter the start point of lamellar-formation and the age-hardenability of Ag–Au–Cu–Pd alloys.

Keywords: Age-hardenability; Precipitation; Metastable phase; Lamellar-forming grain boundary reaction; Softening
* Correspondence address, Assoc. Prof., Hyo-Joung Seol, Dept. of Dental Materials, School of Dentistry and Medical Research Institute, Pusan National University, Beomeo-Ri, Mulgeum-Eup, Yangsan-Si, Gyeongsangnam-Do, 626–814, South Korea, Tel.: +82-51-510-8229, Fax: +82-51-510-8228, E-mail:

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Received: 2012-7-12
Accepted: 2012-9-25
Published Online: 2013-08-16
Published in Print: 2013-06-13

© 2013, Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Original Contributions
  4. Analysis of V(C, N) nanoparticles in a medium carbon bainitic microalloyed steel and their influence on strengthening
  5. Experimental and numerical investigation of the microstructural influence on the deformation behavior of notched cp-titanium specimens
  6. Interfacial study of Si–Ge multilayers grown using ultrahigh-vacuum chemical vapor deposition
  7. Age-hardenability related to precipitation and lamellar-forming grain boundary reaction in dental low-carat gold alloy
  8. Calorimetric study and phase diagram investigation of the Au–Ga system
  9. Roles of iron and copper salts for controlling morphology of silver nanostructures
  10. Hydrothermal synthesis of nanowires, nanobelts, and nanotubes of vanadium oxides from one reaction system
  11. Facile synthesis of ultrafine TiO2 nanowires with large aspect ratio and its photoactivity
  12. Kinetics of thermal dehydration of sol-gel derived MgO–ZrO2 composite hydrogel
  13. Synthesis and reaction process of β-Si3N4 by means of carbothermal nitridation of serpentine
  14. Analysis of size effect and anisotropy of 6H – SiC thermal conductivity
  15. Effects of molecular polarity on nanofluidic behavior in a silicalite
  16. Vertical static compression performance of honeycomb paperboard
  17. Short Communications
  18. Synthesis of phase purity V2AlC via self-propagation high temperature sintering
  19. Densification and microwave properties of low-temperature co-fired CaO–B2O3–SiO2 glass-ceramic with La–B–Si additions
  20. DGM News
  21. DGM News
https://doi.org/10.3139/146.110904
Schlagwörter für diesen Artikel
Age-hardenability; Precipitation; Metastable phase; Lamellar-forming grain boundary reaction; Softening

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Original Contributions
  4. Analysis of V(C, N) nanoparticles in a medium carbon bainitic microalloyed steel and their influence on strengthening
  5. Experimental and numerical investigation of the microstructural influence on the deformation behavior of notched cp-titanium specimens
  6. Interfacial study of Si–Ge multilayers grown using ultrahigh-vacuum chemical vapor deposition
  7. Age-hardenability related to precipitation and lamellar-forming grain boundary reaction in dental low-carat gold alloy
  8. Calorimetric study and phase diagram investigation of the Au–Ga system
  9. Roles of iron and copper salts for controlling morphology of silver nanostructures
  10. Hydrothermal synthesis of nanowires, nanobelts, and nanotubes of vanadium oxides from one reaction system
  11. Facile synthesis of ultrafine TiO2 nanowires with large aspect ratio and its photoactivity
  12. Kinetics of thermal dehydration of sol-gel derived MgO–ZrO2 composite hydrogel
  13. Synthesis and reaction process of β-Si3N4 by means of carbothermal nitridation of serpentine
  14. Analysis of size effect and anisotropy of 6H – SiC thermal conductivity
  15. Effects of molecular polarity on nanofluidic behavior in a silicalite
  16. Vertical static compression performance of honeycomb paperboard
  17. Short Communications
  18. Synthesis of phase purity V2AlC via self-propagation high temperature sintering
  19. Densification and microwave properties of low-temperature co-fired CaO–B2O3–SiO2 glass-ceramic with La–B–Si additions
  20. DGM News
  21. DGM News
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