Molecular dynamic characteristic temperatures for predicting metallic glass forming ability
| Autor: | Benjamin Afflerbach, Izabela Szlufarska, Lane E. Schultz, Dane Morgan |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
010302 applied physics
Condensed Matter - Materials Science Work (thermodynamics) Materials science Amorphous metal General Computer Science Logarithm Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences General Physics and Astronomy Thermodynamics 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology 01 natural sciences Casting Amorphous solid Computational Mathematics Molecular dynamics Viscosity Mechanics of Materials 0103 physical sciences General Materials Science 0210 nano-technology Cooling curve |
| Zdroj: | Computational Materials Science. 201:110877 |
| ISSN: | 0927-0256 |
| Popis: | We explore the use of characteristic temperatures derived from molecular dynamics to predict aspects of metallic Glass Forming Ability (GFA). Temperatures derived from cooling curves of self-diffusion, viscosity, and energy were used as features for machine learning models of GFA. Multiple target and model combinations with these features were explored. First, we use the logarithm of critical casting thickness, l o g 10 ( D m a x ) , as the target and trained regression models on 21 compositions. Application of 3-fold cross-validation on the 21 l o g 10 ( D m a x ) alloys showed only weak correlation between the model predictions and the target values. Second, the GFA of alloys were quantified by melt-spinning or suction casting amorphization behavior, with alloys that showed crystalline phases after synthesis classified as Poor GFA and those with pure amorphous phases as Good GFA. Binary GFA classification was then modeled using decision tree-based methods (random forest and gradient boosting models) and were assessed with nested-cross validation. The maximum F1 score for the precision–recall with Good Glass Forming Ability as the positive class was 0 . 82 ± 0 . 01 for the best model type. We also compared using simple functions of characteristic temperatures as features in place of the temperatures themselves and found no statistically significant difference in predictive abilities. Although the predictive ability of the models developed here are modest, this work demonstrates clearly that one can use molecular dynamics simulations and machine learning to predict metal glass forming ability. |
| Databáze: | OpenAIRE |
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