Effect of Cu Content on Unique Hardening Behavior of Dental Ag-Pd-Au-Cu System Alloy Subjected to Solution Treatment

Yong Hwan Kim; Mitsuo Niinomi; Toshikazu Akahori; Masaaki Nakai; Harumi Tsutsumi; Hisao Fukui

doi:10.4028/www.scientific.net/MSF.654-656.2200

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Effect of Temperature and Strain Rate on Microstructure of Dynamically Recrystallized Ni₄₅Co₅ Mn_36.7In_13.3 Alloy
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Biodegradable Mg-Ca and Mg-Ca-Y Alloys for Regenerative Medicine
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Calcium Phosphate Deposition on Magnesium Alloy for Bioimplant Applications
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Effect of Cu Content on Unique Hardening Behavior of Dental Ag-Pd-Au-Cu System Alloy Subjected to Solution Treatment
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Investigation of Biomimetic Apatite Growth on DLC-ZrO₂ Thin Films Prepared by MOCVD
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Effect of Grain Boundary Segregated Dopant on Phase Stability in Tetragonal Zirconia Polycrystal
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Evaluation and Control of Crystallographic Alignment of Biological Apatite Crystallites in Bones
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Change in Biological Apatite Orientation in Beagle Mandible
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HomeMaterials Science ForumMaterials Science Forum Vols. 654-656Effect of Cu Content on Unique Hardening Behavior...

Effect of Cu Content on Unique Hardening Behavior of Dental Ag-Pd-Au-Cu System Alloy Subjected to Solution Treatment

Abstract:

Hardness of Ag-20Pd-12Au-14.5Cu (mass%) subjected to a solution treatment (ST) at a temperature over 1073 K followed by water quenching increases drastically. This unique hardening behavior is not clarified becasue of their complex microsturucures. In this study, the relationship between the unique hardening behaviour and the microstructure of dental Ag-20Pd-12Au-xCu subjected to ST with different Cu/Ag ratios was investigated. The Vickers hardness of Ag-20Pd-12Au-14.5Cu increases remarkably from 192 to 286 Hv after ST whereas that of Ag-20Pd-12Au-6.5Cu decreases and that of Ag-20Pd-12Au-20Cu increases slightly after ST, respectively. The spotty regions are observed in only certain areas of Ag-20Pd-12Au-14.5Cu subject to ST. It is considered that the appearance of the spotty regions affects mainly to the unique hardening behaviour in Ag-20Pd-12Au-xCu.