Silver-Palladium-Copper Alloys for Laser Irradiation

  • OHKUMA Kazuo
    Department of Dental Materials Science, The Nippon Dental University
  • YONEYAMA Tomoyuki
    Department of Precision Machine, Faculty of Technology, Tokyo Electric University

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Other Title
  • 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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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.

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