Gold-platinum (Au-Pt) alloy has aroused considerable attention due to its ultra-low magnetic susceptibility (MS) in testing mass (TM) on spacecraft. However, the effect of Au content on the properties of the alloy has not yet been understood. In this study, the composition design of Au-Pt alloy with ultra-low MS was achieved through density functional theory (DFT) and experimental methods. The elastic, thermal properties and electronic structure were systematically investigated, the composition range was further optimized and Au75Pt25 was determined to be the most suitable alloy for TM material. The phase composition of this alloy after cold rolling and solid solution was characterized, indicating a single-phase FCC structure. In addition, there is a good validation between the experimental Vickers hardness and the DFT results. This work provides new insights into the compositional optimization of Au-Pt alloys and lays the foundation for alloy development.

中文翻译：

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超低磁化率金铂合金的成分设计：第一性原理与实验验证


金铂（Au-Pt）合金因其超低磁化率（MS）在航天器质量（TM）测试中引起了广泛关注。然而，Au含量对合金性能的影响尚不清楚。本研究通过密度泛函理论（DFT）和实验方法实现了超低MS的Au-Pt合金的成分设计。对弹性、热性能和电子结构进行了系统研究，进一步优化了成分范围，确定Au75Pt25是最适合TM材料的合金。对冷轧固溶后该合金的相组成进行了表征，表明其具有单相 FCC 结构。此外，实验维氏硬度与DFT结果之间也有很好的验证。这项工作为Au-Pt合金的成分优化提供了新的见解，为合金的开发奠定了基础。