Elucidation of Characteristic Strengthening Mechanisms in Dental Gold Alloys by High Resolution Electron Microscopy
通过高分辨率电子显微镜阐明牙科金合金的特性强化机制
基本信息
- 批准号:03452277
- 负责人:
- 金额:$ 4.48万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (B)
- 财政年份:1991
- 资助国家:日本
- 起止时间:1991 至 1993
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Age-hardening characteristics and associated phase transformations were studied by means of electrical resistivity measurements, hardness tests, X-ray and electron diffraction, transmission electron microscopy and scanning electron microscopic observations in an AuCu-14at.%Ag pseudobinary alloy. The critical temperature for ordering was determined to be 650 K and the spinodal temperature was estimated to be 640 K.Age-hardening at 623 K was attributed to nucleation and growth processes of the AuCu II' metastble ordered phase even though the ageing temperature was just below the spinodal temperature. While hardening in the lower temperature range took place at two stages, the former was due to spinodal decomposition and the latter was brought about by ordering of AuCu I' and/or AuCu II' metastable phases depending on ageing temperature.The age-hardening mechanism of a commercial dental gold alloy containing platinum and palladium (Au-32at.%Cu-7.6at.%Ag-6.2at.%Zn-3.8at.%Pd-3.5at.%Pt) was also studied. The sequence of phase transformations during isothermal ageing below the critical temperature of ordering, Tc=825 K, was described as follows : disordered solid solution alpha_0 (fcc)--metastable AuCu I' ordered phase (fct) + metastable alpha_2' disordered phase (fcc)--equilibrium AuCu I ordered phase (fct) + equilibrium alpha_2 desordered phase (fcc). High resolution electron microscopic observation revealed that the hardening was due to the introduction of coherency strain at the interface between the AuCu I' ordered platelet and the surrounding matrix.The spinodal ordering which was predicted by the CVM was confirmed by means of TEM, SAED and XRD examinations in the equiatomic AuCu alloy using direct ageing. The coherent phase boundary, Tc', and the spinodal ordering temperature, Ts, were identified from differences of microstructural features and changes in XRD patterns during ageing at verious temperatures. The Tc' and Ts were determined to be 648 K and 630 K.
通过电阻率测量、硬度测试、x射线和电子衍射、透射电镜和扫描电镜观察,研究了AuCu-14at的时效硬化特征和相关相变。%Ag伪二元合金。定序的临界温度为650 K,旋多温度估计为640 K。在623 K时时效硬化主要是由于AuCu II亚稳有序相的形核和生长过程,尽管时效温度略低于峰值温度。而在较低温度范围内的硬化发生在两个阶段,前者是由于spinodal分解,后者是由于AuCu I‘和/或AuCu II’亚稳相根据时效温度的顺序而产生的。研究了含铂和钯的商用牙科金合金(Au-32at.%Cu-7.6at.%Ag-6.2at.%Zn-3.8at.%Pd-3.5at.%Pt)的时效硬化机理。在有序临界温度Tc=825 K以下的等温时效过程中,相变顺序为:无序固溶体alpha_0 (fcc)—亚稳AuCu I′有序相(fct) +亚稳alpha_2′无序相(fcc)—平衡AuCu I有序相(fct) +平衡alpha_2无序相(fcc)。高分辨率电镜观察表明,硬化是由于在有序血小板与周围基体的界面处引入了相干应变。采用直接时效法对等原子AuCu合金进行了TEM、SAED和XRD测试,证实了CVM预测的旋多有序现象。通过不同温度下时效过程中微观结构特征的差异和XRD谱图的变化,确定了合金的相干相界Tc′和独立有序温度Ts。测得Tc′和Ts分别为648 K和630 K。
项目成果
期刊论文数量(30)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Hisatsune,K.: "Phase transformation behaviour of a low carat gold alloy for porcelain bonding during continuous heating" Journal of Materials Science:Materials in Madicine. 3. 54-58 (1992)
Hisatsune,K.:“连续加热过程中用于瓷器粘合的低克拉金合金的相变行为”材料科学杂志:医学材料。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Udoh, K.: "Age-hardening associated with ordering and spinodal decomposition in a AgCu-40at.%Au pseudobinary alloy" Journal of Materials Science. 27. 504-510 (1992)
Udoh,%20K.:%20"时效硬化%20关联%20与%20排序%20和%20旋节线%20分解%20in%20a%20AgCu-40at.%Au%20伪二元%20合金"%20期刊%20of%20材料%20科学.%
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- 影响因子:0
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Tani,T.: "Age-hardening Mechanisms in a Commercial Dental Gold Alloy ContainingPlatinum and Palladium" Journal of Dental Research. 70. 1350-1357 (1991)
Tani,T.:“含铂和钯的商业牙科金合金的时效硬化机制”牙科研究杂志。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
K.Hisatsune,Y.Tanaka,T.Tani,K.Udoh and K.Yasuda: "Phase transformation behaviour of a low carat gold alloy for porcelain bonding during continuous heating" Journal of Materials Science;Materials in Medicine. 3. 54-58 (1992)
K.Hisatsune、Y.Tanaka、T.Tani、K.Udoh 和 K.Yasuda:“连续加热期间用于瓷器粘合的低克拉金合金的相变行为”材料科学杂志;医学材料。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
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- 通讯作者:
Udoh, K.: "Microstructure of AuCu II in the disordered f.c.c.phase of AuCu-14at.%Ag alloy" Journal of Alloys and Compounds. 176. 147-158 (1991)
Udoh,%20K.:%20“显微结构%20of%20AuCu%20II%20in%20the%20无序%20f.c.c.相%20of%20AuCu-14at.%Ag%20合金”%20期刊%20of%20合金%20和%20化合物。
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YASUDA Katsuhiro其他文献
YASUDA Katsuhiro的其他文献
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{{ truncateString('YASUDA Katsuhiro', 18)}}的其他基金
Characterization of Interfaces in Dental Alloys by HREM
通过 HREM 表征牙科合金中的界面
- 批准号:
03044117 - 财政年份:1991
- 资助金额:
$ 4.48万 - 项目类别:
Grant-in-Aid for international Scientific Research
High-Resolution Electron Microscopy Study of Phase Transformation in Dental Precious Metals Alloys
牙科贵金属合金相变的高分辨率电子显微镜研究
- 批准号:
01044112 - 财政年份:1989
- 资助金额:
$ 4.48万 - 项目类别:
Grant-in-Aid for international Scientific Research
High-Resolution Electron Microscopy Study on Characterization of Interfaces induced by Phase Transformation in Dental Gold Alloys
牙科金合金相变诱导界面表征的高分辨率电子显微镜研究
- 批准号:
01460241 - 财政年份:1989
- 资助金额:
$ 4.48万 - 项目类别:
Grant-in-Aid for General Scientific Research (B)
High-Resolution Electron Microscopy Study of Phase Transformations in Dental Alloys
牙科合金相变的高分辨率电子显微镜研究
- 批准号:
63044111 - 财政年份:1988
- 资助金额:
$ 4.48万 - 项目类别:
Grant-in-Aid for Overseas Scientific Research
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