Page 7 - Read Online

Zhou et al. J Mater Inf 2022;2:18 Journal of
DOI: 10.20517/jmi.2022.27
Materials Informatics

Review Open Access

New trends in additive manufacturing of
high-entropy alloys and alloy design by machine

learning: from single-phase to multiphase systems

1,2
3
1,2
1,2
4
1,2
1,2
Yinghao Zhou , Zehuan Zhang , Dawei Wang , Weicheng Xiao , Jiang Ju , Shaofei Liu , Bo Xiao , Ming
4
Yan , Tao Yang 1,5*
1
Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China.
2
Centre for Advanced Nuclear Safety and Sustainable Development, City University of Hong Kong, Hong Kong, China.
3
College of Physics, Sichuan University, Chengdu 610064, Sichuan, China.
4
Department of Materials Science and Engineering, Shenzhen Key Laboratory for Additive Manufacturing of High-performance
Materials, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China.
5
Hong Kong Institute for Advanced Study, City University of Hong Kong, Hong Kong, China.
*
Correspondence to: Prof. Tao Yang, Department of Materials Science and Engineering, City University of Hong Kong. Yeung
academic building, Tat Chee Avenue Kowloon, Hong Kong, China. E-mail: taoyang6@cityu.edu.hk
How to cite this article: Zhou Y, Zhang Z, Wang D, Xiao W, Ju J, Liu S, Xiao B, Yan M, Yang T. New trends in additive
manufacturing of high-entropy alloys and alloy design by machine learning: from single-phase to multiphase systems. J Mater Inf
2022;2:18. https://dx.doi.org/10.20517/jmi.2022.27
Received: 18 Sep 2022 First Decision: 14 Oct 2022 Revised: 22 Oct 2022 Accepted: 9 Nov 2022 Published: 17 Nov 2022
Academic Editors: Xingjun Liu, Wen Chen, Kotiba Hamad, Wei Xiong Copy Editor: Ke-Cui Yang Production Editor: Ke-Cui
Yang
Abstract
Alloys with excellent properties are always in significant demand for meeting the severe conditions of industrial
applications. However, the design strategies of traditional alloys based on a single principal element have reached
their limits in terms of property optimization. The concept of high-entropy alloys (HEAs) provides a new design
strategy based on multicomponent elements, which may overcome the bottleneck problems that exist in traditional
alloys. To further maximize the capability of HEAs, a novel additive manufacturing (AM) technique has been
utilized to produce HEA components with the desired structures and properties. This review considers a new trend
in the AM of HEAs, i.e., from the AM of single-phase HEAs to multiphase HEAs. Although most as-printed
single-phase HEAs show superior tensile properties to as-cast ones, their strength is still not satisfactory,
especially at elevated temperatures. Thus, multiphase HEAs are developed by introducing hard second phases,
such as L1 , BCC, carbides, oxides, nitrides, and so on. These phases can be introduced to the matrix using in situ
2
alloying during AM or the subsequent heat treatment. Dislocation strengthening is considered as the main reason

© The Author(s) 2022. Open Access This article is licensed under a Creative Commons Attribution 4.0
International License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, sharing,
adaptation, distribution and reproduction in any medium or format, for any purpose, even commercially, as
long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and
indicate if changes were made.

www.jmijournal.com