Abstract Nanocrystalline alloys can be stabilized through selective grain boundary segregation of specific solute element additions. Increasing attention is being paid to ternary and higher order systems, where complex interactions govern segregation. To efficiently study the large composition spaces of such systems, we apply a high-throughput combinatorial technique revealing nanocrystalline stability through composition-grain-size maps. We compare two systems with distinct binary and ternary alloy interactions: In Pt–AuAg both binaries are expected to be stable, whereas in Pt–AuPd the Pt–Pd binary is unstable and Au-induced co-segregation of Pd was previously reported. For ternary Pt–AuAg we find excellent thermal stability throughout. The Pt–AuPd system, by contrast, divides into an unstable regime, where Pd solute dominates and precipitates, and a stable regime, where Au solute dominates and retains Pd in the grain boundary. Overall, by combining current theory and the introduced combinatorial approach, stable multicomponent nanocrystalline composition spaces can be rapidly determined.

中文翻译：

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三元纳米晶合金热稳定性的组合研究

摘要 通过特定溶质元素添加的选择性晶界偏析可以稳定纳米晶合金。人们越来越关注三元和更高阶系统，其中复杂的相互作用控制着隔离。为了有效地研究此类系统的大组成空间，我们应用了一种高通量组合技术，通过组成-晶粒尺寸图揭示了纳米晶体的稳定性。我们比较了两种具有不同二元和三元合金相互作用的系统：在 Pt-AuAg 中，两种二元预期都是稳定的，而在 Pt-AuPd 中，Pt-Pd 二元不稳定，并且先前报道了 Au 诱导的 Pd 共偏析。对于三元 Pt-AuAg，我们发现自始至终都具有出色的热稳定性。相比之下，Pt-AuPd 系统分为不稳定状态，其中 Pd 溶质占主导地位并沉淀，和稳定的状态，其中 Au 溶质在晶界中占主导地位并保留 Pd。总的来说，通过结合当前的理论和引入的组合方法，可以快速确定稳定的多组分纳米晶组成空间。