Generalized Stacking Fault Energy of {10-11}&lt;11-23&gt; Slip System in Mg-Based Binary Alloys: A First Principles Study

Dou, Yuchen; Luo, Hong‐Gang

doi:10.3390/ma12091548

Cited by 9 publications

(3 citation statements)

References 33 publications

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“…[ 16–18 ] Many studies on the GSFE of binary alloys have used the density functional theory (DFT). [ 19–21 ] Ding et al [ 1,19 ] studied the GSFE of basal < a >, prismatic (prism) < a >, pyramidal I (Py‐I) < a >, Py‐I < c + a >, and pyramidal II (Py‐II) < c + a > slip systems. The results showed that the activation of Py‐II slip had a significant role in plasticity.…”

Section: Introductionmentioning

confidence: 99%

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Plasticity Improvement of Mg Alloys with Alloying Atoms (Gd, Y)

Pang

Mei

et al. 2022

Physica Status Solidi (b)

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Low plasticity limits the wide application of magnesium alloys. The influence of atoms (Gd, Y) on the generalized stacking fault energy (GSFE) is investigated by density functional theory (DFT), and the possibility of activating basal and nonbasal slip systems is quantified. The lattice parameters and elastic constants are also calculated via DFT. The tensile tests of Mg–2Gd, Mg–2Y, and Mg–2Gd–2Y (at%) are carried out to verify the calculated results. It is found that both Gd and Y atoms can improve plasticity, and Gd has a better effect than Y. The different degrees of influence are mainly due to the different electron types of atoms. Gd belongs to the s‐ and f‐electron type and Y belongs to the d‐electron type. The further calculation of the electron density difference indicates that Y weakens the influence of the Gd atom, and the mechanism diagram is constructed.

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Section: Introductionmentioning

confidence: 99%

“…(DFT). [19][20][21] Ding et al [1,19] studied the GSFE of basal <a>, prismatic (prism) <a>, pyramidal I (Py-I) <a>, Py-I <c þ a>, and pyramidal II (Py-II) <c þ a> slip systems. The results showed that the activation of Py-II slip had a significant role in plasticity.…”

Section: Introductionmentioning

confidence: 99%

Plasticity Improvement of Mg Alloys with Alloying Atoms (Gd, Y)

Pang

Mei

et al. 2022

Physica Status Solidi (b)

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“…It is worth mentioning that it is beyond the scope of the present work to build a predictive ML model to calculate stacking fault energy as a function of composition. However, the presently suggested descriptors are one of the fundamentals to build this ML model in addition to collecting and analyzing the values of stacking fault energy in the present work and especially in the literature, for example [35,[41][42][43][44][45][46][47][48][49][50].…”

Section: Introductionmentioning

confidence: 99%

Correlation analysis of materials properties by machine learning: illustrated with stacking fault energy from first-principles calculations in dilute fcc-based alloys

Chong

Shang

Krajewski

et al. 2021

J. Phys.: Condens. Matter

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Advances in machine learning (ML), especially in the cooperation between ML predictions, density functional theory (DFT) based first-principles calculations, and experimental verification are emerging as a key part of a new paradigm to understand fundamentals, verify, analyze, and predict data, and design and discover materials. Taking stacking fault energy (γ SFE) as an example, we perform a correlation analysis of γ SFE in dilute Al-, Ni-, and Pt-based alloys by descriptors and ML algorithms. These γ SFE values were predicted by DFT-based alias shear deformation approach, and up to 49 elemental descriptors and 21 regression algorithms were examined. The present work indicates that (i) the variation of γ SFE affected by alloying elements can be quantified through 14 elemental attributes based on their statistical significances to decrease the mean absolute error (MAE) in ML predictions, and in particular, the number of p valence electrons, a descriptor second only to the covalent radius in importance to model performance, is unexpected; (ii) the alloys with elements close to Ni and Co in the periodic table possess higher γ SFE values; (iii) the top four outliers of DFT predictions of γ SFE are for the alloys of Al23La, Pt23Au, Ni23Co, and Al23Be based on the analyses of statistical differences between DFT and ML predictions; and (iv) the best ML model to predict γ SFE is produced by Gaussian process regression with an average MAE < 8 mJ m−2. Beyond detailed analysis of the Al-, Ni-, and Pt-based alloys, we also predict the γ SFE values using the present ML models in other fcc-based dilute alloys (i.e., Cu, Ag, Au, Rh, Pd, and Ir) with the expected MAE < 17 mJ m−2 and observe similar effects of alloying elements on γ SFE as those in Pt23X or Ni23X.

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