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Silver-Palladium-Copper Alloys for Laser Irradiation
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- OHKUMA Kazuo
- Department of Dental Materials Science, The Nippon Dental University
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- YONEYAMA Tomoyuki
- Department of Precision Machine, Faculty of Technology, Tokyo Electric University
Bibliographic Information
- Other Title
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- レーザ用銀パラジウム銅合金
- (第3報) 硬化機序
- Part 3. Hardening Mechanism
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Description
Gold-Silver-Palladium alloy is generally considered softened by rapid heating or cooling such as by laser irradiation. We therefore investigated the hardening mechanism for base materials of Gold-Silver-Palladium alloy, Ag-Pd-Cu alloy and Ag-Pd-Cu-Zn alloy, which do not contain gold, using laser irradiation, and obtained the following results.<br> 1) The surface hardness of 45 wt% Ag-25Pd-30Cu alloy, among the Ag-Pd-Cu alloys, was 264.0 HV after laser irradiation, 66.8% harder than that after casting. Based on the results of X-ray diffraction, the hardening mechanism of the alloy by laser irradiation was a phase transformation from α2 (Ag-rich) to α1 (Cu-rich).<br> 2) The surface hardness of 36.0 wt% Ag-31.5Pd-22.5Cu-10.0Zn alloy, among Ag-Pd-Cu-Zn alloys, was 334.5 HV after laser irradiation, 70.9% harder than that after casting. EPMA at the site hardened by laser irradiation and the same site after additional heating in stain-free electric furnace, revealed a great difference between atomic distributions at the two sites. The hardening mechanism of the alloy by irradiation was found to be strain induced by changing solid solution limits.
Journal
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- The Journal of the Japanese Society for Dental Materials and Devices
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The Journal of the Japanese Society for Dental Materials and Devices 14 (4), 414-430, 1995
The Japanese Society for Dental Materials and Devices
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Details 詳細情報について
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- CRID
- 1390282679188772736
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- NII Article ID
- 110002993394
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- NII Book ID
- AN00127279
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- ISSN
- 21884188
- 02865858
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- Text Lang
- ja
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- Data Source
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- JaLC
- CiNii Articles
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- Abstract License Flag
- Disallowed