Keywords

Magnesium AZ31, Twin Formation, Machine Learning, Decision Tree, EBSD

Abstract

To explore the driving forces behind deformation twinning in Mg AZ31, a machine learning framework is utilized to mine data obtained from electron backscatter diffraction (EBSD) scans in order to extract correlations in physical characteristics that cause twinning. The results are intended to inform physics-based models of twin nucleation and growth. A decision tree learning environment is selected to capture the relationships between microstructure and twin formation; this type of model effectively highlights the more influential characteristics of the local microstructure. Trees are assembled to analyze both twin nucleation in a given grain, and twin propagation across grain boundaries. Each model reveals a unique combination of crystallographic attributes that affect twinning in the Mg. Twin nucleation is found to be mostly controlled by a combination of grain size, basal Schmid factor, and bulk dislocation density while twin propagation is affected most by grain boundary length, basal Schmid factor, angle from grain boundary plane to the RD plane, and grain boundary misorientation. The machine learning framework can be readily adapted to investigate other relationships between microstructure and material response.

Original Publication Citation

Andrew Orme, Isaac Chelladurai, T Rampton, D Fullwood, A Khosravani, M Miles, R Mishra, Insights into Twinning in AZ31 Magnesium: A Combined EBSD and Machine Learning Study, Computational Materials Science, 124 (2016), 353-363

Document Type

Peer-Reviewed Article

Publication Date

2016-07-12

Permanent URL

http://hdl.lib.byu.edu/1877/3819

Publisher

Computational Materials Science

Language

English

College

Ira A. Fulton College of Engineering and Technology

Department

Mechanical Engineering

University Standing at Time of Publication

Full Professor

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