Author: Li, Bowen
Title: Machine learning approach for predicting the tensile strength of high entropy alloys
Advisors: Shi, S. Q. (ME)
Degree: M.Sc.
Year: 2021
Subject: Alloys -- Testing
Machine learning
Hong Kong Polytechnic University -- Dissertations
Department: Department of Mechanical Engineering
Pages: xii, 121 pages : color illustrations
Language: English
Abstract: Researchers showed great passion for high entropy alloys (HEAs) in the past decade for its broad compositional space, relatively simple phase structure and outstanding properties. Like most metal materials, finding a way to promote strength while maintaining satisfactory plasticity has attracted great concerns. Composition design induced multiple toughening mechanisms, combined with appropriate processing is promising. Meanwhile, an advanced data-driven machine learning (ML) assisted materials design strategy is developing and show great potentials. In this research, a ML framework was performed to predict the tensile strength (UTS) of HEAs with purpose of rapid search and lead of next-generation experimental alloys. The ML models were constructed based on datasets with 261 samples from HEAs experiments, and 57 related feature candidates were presented. A three-step feature selection were adopted after carefully considering the multiple validation methods and algorithms available. Redundant and irrelevant features were eliminated by CFS based RReliefF and MDI features importance ranking. A wrapper method finally selected the best feature subsets for datasets with processing attributes and as cast HEAs on two separate models, namely the Support Vector Machine with puk kernel and Random Forest Regression. Sets of better hyperparameters were given according to the grid search. Finally, the outperform model was applied to guide the composition design and heat treatment process of HEAs, demonstrated great predictive capacity. Also, challenges in building more robust and applicable model, and understanding the connection between the data, the model and the performance expressed were proposed.
Rights: All rights reserved
Access: restricted access

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