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标题: "Machine-learning approach for the phase stability and mechanical properties of disordered alloys at finite temperature"
原文链接: "https://arxiv.org/abs/2608.10465"
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## Condensed Matter > Materials Science

## Title:Machine-learning approach for the phase stability and mechanical properties of disordered alloys at finite temperature

Authors:[Rutchapon Hunkao](https://arxiv.org/search/cond-mat?searchtype=author&query=Hunkao,+R), [Urvesh Patil](https://arxiv.org/search/cond-mat?searchtype=author&query=Patil,+U), [Stefano Sanvito](https://arxiv.org/search/cond-mat?searchtype=author&query=Sanvito,+S)

[View PDF](https://arxiv.org/pdf/2608.10465) [HTML (experimental)](https://arxiv.org/html/2608.10465v1)

> Abstract:The prediction of stable alloys forming solid-state solutions across large portions of the composition space is a serious theoretical challenge, since one has to evaluate the Gibbs free energy, including both configurational and vibrational contributions. This requires an energy theory capable of extremely high throughput. By taking the Ni-Pd system as prototype, we construct an efficient Jacobi-Legendre machine-learning potential based on density-functional-theory data, which provides accurate energies and forces across the entire composition space. Based on a cluster expansion up to three-body terms and only 873 trainable parameters, this allows us to compute the partition function by directly integrating all accessible microstates, differing for composition, atomic configuration and thermal agitation. We confirm that Ni and Pd are fully miscible, forming an $fcc$ solid-state solution. This is only metastable at room temperature, while becomes thermodynamically stable at around 600~K, with the stability achieved first at the Pd-rich end of the composition range. Interestingly, entropy and heat capacity analysis reveal a competition between the solid-state solution and two intermetallic phases with long-period L1 $_0$ structure for NiPd and NiPd $_3$. All in all, our approach offers a powerful and high-throughput workflow for the study of disordered alloys, an approach that can be extended to multi-component systems such as high-entropy alloys.

| Subjects: | Materials Science (cond-mat.mtrl-sci) |
| --- | --- |
| Cite as: | [arXiv:2608.10465](https://arxiv.org/abs/2608.10465) \[cond-mat.mtrl-sci\] |
|  | (or [arXiv:2608.10465v1](https://arxiv.org/abs/2608.10465v1) \[cond-mat.mtrl-sci\] for this version) |
|  | [https://doi.org/10.48550/arXiv.2608.10465](https://doi.org/10.48550/arXiv.2608.10465) |

## Submission history

From: Rutchapon Hunkao \[[view email](https://arxiv.org/show-email/fe7e35e0/2608.10465)\]  
**\[v1\]** Tue, 11 Aug 2026 04:23:38 UTC (27,324 KB)

[Which authors of this paper are endorsers?](https://arxiv.org/auth/show-endorsers/2608.10465) | Disable MathJax ([What is MathJax?](https://info.arxiv.org/help/mathjax.html))
