Coherent Phase Diagram of Au-Cu-Pt Ternary System by High Resolution Electron Microscopy

高分辨率电子显微镜下 Au-Cu-Pt 三元体系的相干相图

• 批准号: 07457475
• 负责人: UDOH Koh-ichi
• 金额: $ 4.99万
• 依托单位: Nagasaki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07457475/
• 关键词: Gold alloy; Platinum; Dental Precious alloy; Age-hardening; Order-disorder transformation; Transmission electron microscopy; Selected area diffraction; X-ray diffraction

Acoherent phase diagram of the AuCu-Pt pseudobinary system was determined mainly by means of TEM bright- and dark-field imaging and selected area electron diffraction techniques according to the hypothesis of Allen and Cahn, because a coherent phase diagram gives us more effective information to predict phase transformations related to age-hardening characteristics in an alloy system than an equilibrium phase diagram.The following phase regions were found in the present experiments ; (1) alpha_0 single-phase of fcc disordered solid solution region ; (2) AuCu I(L1_0)fct ordered single-phase region ; (3) long-period orthorhombic superstructure AuCu II(L1_<0-S>)single-phase region ; (4) alpha + AuCu I region of two coexisting phases ; (5) AuCu I + AuCu II region of two coexisting phases ; (6) alpha + AuCu I + AuCu II region of three coexisting phases.

根据Allen和Cahn的假设，AuCu-Pt赝二元体系的相干相图主要通过TEM明暗场成像和选区电子衍射技术来确定，因为相干相图为我们提供了更有效的信息与平衡相图相比，可以预测合金系统中与时效硬化特性相关的相变。在本实验中发现了以下相区； (1) alpha_0单相fcc无序固溶体区域； (2) AuCu I(L1_0)fct 有序单相区； (3) 长周期斜方上部结构AuCu II(L1_<0-S>)单相区； (4) 两相共存的α+AuCu I区； (5) 两相共存的 AuCu I + AuCu II 区域； (6)三相共存的α+AuCuI+AuCuII区域。

项目成果

K.Hisatsune: "Phase Transformation in a Dental Gold Alloy for Soldering" Journal of Alloys and Compounds. 261. 308-312 (1997)

K.Hisatsune：“用于焊接的牙科金合金的相变”合金与化合物杂志。

A.Sakrana: "A coherent phase diagram of the[(AuCu)_<0.86>]_<1-x>Pt_x pseudobinary section in Au-Cu-Ag-Pt quaternary system" Dental Materials Journal. 16. 144-155 (1997)

A.Sakrana：“Au-Cu-Ag-Pt 四元系统中 [(AuCu)_<0.86>]_<1-x>Pt_x 伪二元部分的相干相图”《牙科材料杂志》。

K.Hisatsune: "Three Stages of ordering in CuAu" Intermetallics. 3. 335-339 (1995)

K.Hisatsune：“CuAu 有序化的三个阶段”金属间化合物。

K.Hamasaki: "Ageing behaviour in a dental low gold alloy with high copper content" Journal of Materials Science:Materials in Medicine. 9. (1998)

K.Hamasaki：“高铜含量牙科低金合金的老化行为”《材料科学杂志：医学材料》。

K.-I.Udoh: "Structural aspect of AuCu I or AuCu II and a cuboidal block configuration of f.c.c.disordered phase in AuCu-Pt and AuCu-Aq pseudobinary alloys" Materials Science and Engineering. A203. 154-164 (1995)

K.-I.Udoh：“AuCu I 或 AuCu II 的结构以及 AuCu-Pt 和 AuCu-Aq 伪二元合金中 f.c.c. 无序相的立方块配置”材料科学与工程。