A reversible solvent segregation transition at grain boundaries in gold-platinum alloys

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-08-05 DOI:10.1016/j.scriptamat.2025.116902

Sebastian Calderon , Wen-Yu Chen , Md. Shariful Islam , Sai S. Tripathy , Maarten P. de Boer , Elizabeth C. Dickey , Gregory S. Rohrer

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Abstract

Solute segregation to grain boundaries in polycrystalline metals and ceramics is a well-known phenomenon that reduces the total energy of the material. In this letter, the segregation of the solvent (Au) to grain boundaries in a binary Au_1-xPt_x (x = 0.15 to 0.18) alloy is demonstrated. After heating in the range of 500 °C to 600 °C and quenching to room temperature, grain boundaries in the alloy are enriched in Au at a mean level of ∼ 4 atoms/nm². When the alloy is annealed at 300 °C and quenched, the mean grain boundary composition is closer to the bulk composition. When the alloy is reheated to 500 °C, the segregation is reestablished, demonstrating that the transformation from the strongly segregated complexion to the weakly segregated complexion is reversible. The driving force for the solvent segregation is likely the lower grain boundary energy of Au in comparison to Pt.

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金-铂合金晶界上的可逆溶剂偏析转变

在多晶金属和陶瓷中，溶质偏析到晶界是一种众所周知的现象，它降低了材料的总能量。在这篇文章中，证明了二元Au1-xPtx （x = 0.15 ~ 0.18）合金中溶剂（Au）向晶界的偏析。在500°C至600°C范围内加热并淬火至室温后，合金的晶界以平均~ 4个原子/nm2的水平富集Au。在300℃退火和淬火后，合金的平均晶界成分更接近体成分。当合金再加热到500℃时，偏析重新建立，表明从强偏析向弱偏析的转变是可逆的。溶剂偏析的驱动力可能是Au的晶界能低于Pt。

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.