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Age-hardening by miscibility limit in a multi-purpose dental gold alloy containing platinum
Gold Bulletin ( IF 2.2 ) Pub Date : 2010-03-01 , DOI: 10.1007/bf03214965
Hyo-Joung Seol , Joo-Hee Park , Ri-Mo Ku , Mi-Gyoung Park , Yong Hoon Kwon , Hyung-Il Kim

This study examined the age-hardening by miscibility limit in a multi-purpose dental gold alloy containing platinum. The hardness increased rapidly in the initial stage of the aging process, reached the maximum value, then decreased continuously with aging time. The significant hardness increase resulted from the heterogeneous precipitation of the Pt-rich β phase from the grain boundary of the Au-rich α1 matrix due to the miscibility limit of Au-Pt system. With increasing aging time, the fine Pt-rich β precipitates covered almost the whole matrix, and by further aging, the precipitates grew coarse. The microstructural coarsening reduced the interface between the Au-rich α1 matrix and the Pt-rich β precipitates, which released the lattice strains between the two phases, resulting in a softening effect. In the later stage of aging process, the Au-containing Pt3In particle-like structure was transformed into the Au-depleted particle-like structure containing relatively large amounts of Cu resulting from the overlapping miscibility limit of both Au-Pt and Ag-Cu systems, which was responsible for the slow decreasing rate in hardness in the later stage of aging.

中文翻译:

含铂多用途牙科金合金中混溶性限制的时效硬化

本研究通过含铂的多用途牙科金合金的混溶性极限检查了时效硬化。硬度在时效过程的初始阶段迅速增加,达到最大值,然后随着时效时间的延长而不断降低。由于 Au-Pt 体系的混溶性限制,富铂 β 相从富金 α1 基体的晶界异相析出,导致硬度显着增加。随着时效时间的增加,细小的富含 Pt 的 β 析出物几乎覆盖了整个基体,随着进一步时效,析出物变得粗大。显微组织粗化减少了富金α1基体和富铂β析出物之间的界面,从而释放了两相之间的晶格应变,从而产生了软化效应。在老化过程的后期,
更新日期:2010-03-01
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