Daniel Marchand^1*, W.A. Curtin^1*

1 Institute of Mechanical Engineering, École Polytechnique Fédérale de Lausanne, CH-1015, Vaud, Switzerland

* Corresponding authors emails: daniel.marchand@epfl.ch, william.curtin@epfl.ch

DOI10.24435/materialscloud:z9-24 [version v1]

Publication date: Jul 14, 2021

How to cite this record

Daniel Marchand, W.A. Curtin, Machine learning for metallurgy: a neural network potential for Al-Cu-Mg, Materials Cloud Archive 2021.106 (2021), https://doi.org/10.24435/materialscloud:z9-24

Description

High-strength metal alloys achieve their performance via careful control of precipitates and solutes. The nucleation, growth, and kinetics of precipitation, and the resulting mechanical properties, are inherently atomic-scale phenomena, particularly during early-stage nucleation and growth. Atomistic modeling using interatomic potentials is a desirable tool for understanding the detailed phenomena involved in precipitation and strengthening, which requires length and time scales far larger than those accessible by first-principles methods. Current interatomic potentials for alloys are not, however, sufficiently accurate for such studies. Here, a family of neural-network potentials (NNPs) for the Al-Cu-Mg system is presented as the first example of a machine-learning potential that can achieve near-first-principles accuracy for many different metallurgically-important aspects of this alloy. High fidelity predictions of intermetallic compounds, elastic constants, dilute solid-solution energetics, precipitate/matrix interfaces, generalized stacking fault energies, and surfaces for slip in matrix and precipitates, antisite defect energies, and other quantities, are shown. The NNP shows some significant transferability to defects and properties outside the structures used to develop the NNP but also shows some errors, highlighting that the use of any interatomic potential requires careful validation in application to specific metallurgical problems of interest.

Materials Cloud sections using this data

Files

File name	Size	Description
2021-05-30_AlMgCu_HalfStructures.tar.gz MD5md5:4add7c6f7cb467ca07148feed2fcf2a4	2.3 MiB	All neural network potentials used in this work.
FPS-structures_input.data.tar.gz MD5md5:a0aad77b3e9ed4086d07c0a6f0246f7c	5.8 MiB	Structures after removal via furthest point sampling
ALL-structures_input.data.tar.gz MD5md5:61bb708399e090dfee234cce25d0a160	9.2 MiB	All structures prior to removal via furthest point sampling
computed_properties.tar.gz MD5md5:1eb5fe3e6faa1f6b215da3cfbe29bc3d	4.6 MiB	All properties as computed by all neural network potentials and DFT in json format for plotting
README.txt MD5md5:680bf88d1dc8384fe46e98d4e33cde54	1.5 KiB	README file

License

Files and data are licensed under the terms of the following license: Creative Commons Attribution 4.0 International.
Metadata, except for email addresses, are licensed under the Creative Commons Attribution Share-Alike 4.0 International license.

External references

Keywords

Aluminum Machine Learning Metallurgy MARVEL/DD2