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Additive Manufacturing of High Entropy Alloys

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Manufacturing Processes and Systems".

Deadline for manuscript submissions: closed (10 August 2022) | Viewed by 2041

Special Issue Editor

State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Interests: additive manufacturing; selective laser sintering; surface modification; ternary composites; mechanical properties; electrical properties

Special Issue Information

Dear Colleagues,

Additive manufacturing (AM), commonly known as 3D printing, is a newly emerging technology for bringing about revolutionary manufacturing by the integration of design flexibility and the rapid fabrication of complex parts through the bottom-up accumulation of materials. These merits make it widely accepted as a new paradigm for the production of high-end components in the aerospace, automotive, healthcare, marine, and energy fields. High-entropy alloys (HEAs), emerging as a novel frontier in the metal materials community, exhibit superior properties due to the presence of multiprincipal elements and are considered alternative materials for critical components in extreme applications. Over the past decade, the fabrication of HEAs using AM has attracted increasing attention in both academic and industrial organizations for obtaining HEA products with desirable performance and seeking their potential applications.

This Special Issue aims at collecting cutting-edge original research papers and reviews on the latest advances in the AM of HEAs. The topic themes include HEA alloy design, processing parameter optimization, characterization techniques, microstructure–property relationships, process modelling, application advances, etc., specifically for AM.

Dr. Chao Cai
Guest Editor

Manuscript Submission Information

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Keywords

  • additive manufacturing
  • high-entropy alloys
  • alloy design
  • microstructure–property relationships
  • process modelling

Published Papers (1 paper)

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Research

13 pages, 3443 KiB  
Article
Manufacturing of Ti-Nb-Cr-V-Ni-Al Refractory High-Entropy Alloys Using Direct Energy Deposition
by Ho-In Jeong, Choon-Man Lee and Dong-Hyeon Kim
Materials 2022, 15(19), 6570; https://doi.org/10.3390/ma15196570 - 22 Sep 2022
Cited by 9 | Viewed by 1623
Abstract
High-entropy alloys (HEAs) are composed of 5–35 at% of five or more elements, have high configurational entropy, do not form intermetallic compounds, and have a single-phase face-centered cubic structure or body-centered cubic structure. In particular, refractory HEAs (RHEAs), based on refractory materials with [...] Read more.
High-entropy alloys (HEAs) are composed of 5–35 at% of five or more elements, have high configurational entropy, do not form intermetallic compounds, and have a single-phase face-centered cubic structure or body-centered cubic structure. In particular, refractory HEAs (RHEAs), based on refractory materials with excellent mechanical properties at high temperatures, have high strength and hardness at room temperature and excellent mechanical properties at low and high temperatures. In this study, the Ti-Nb-Cr-V-Ni-Al RHEAs were deposited using direct energy deposition (DED). In the microstructure of Ti-Nb-Cr-V-Ni-Al, the sigma, BCC A2, and Ti2Ni phases appeared to be different from the BCC A2, BCC B2, and Laves phases predicted in the phase diagram. This microstructure was similar to that of the casted Ti-Nb-Cr-V-Ni-Al and had a constructed fine grain size. It was found that the growth of these microstructures was due to the DED process, which has a fast solidification rate. The fine grain size caused high hardness, and the microhardness of the Ti-Nb-Cr-V-Ni-Al was measured to be about 900 HV. In addition, in order to analyze the thermal properties of Ti-Nb-Cr-V-Ni-Al composed of the refractory material, the heat-affected zone (HAZ) was analyzed through a preheating test. The HAZ was decreased, owing to the high thermal diffusivity of Ti-Nb-Cr-V-Ni-Al. Full article
(This article belongs to the Special Issue Additive Manufacturing of High Entropy Alloys)
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