High Entropy Alloy, Hard to Form Metal and Alloy of Additive Manufacture

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystal Engineering".

Deadline for manuscript submissions: closed (20 December 2021) | Viewed by 3013

Special Issue Editors


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Guest Editor
Department of Mold and Die Engineering, National Kaohsiung University of Sciences and Technology, Kaohsiung City 807618, Taiwan
Interests: additive manufacture; wire drawing, high entropy alloy; titanium alloy; nickel titanium and phase transformation

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Guest Editor
Department of Mold and Die Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 807, Taiwan
Interests: surface modifications of titanium alloys; coatings for biomedical implants; biocompatible/biodegradable polymer coatings; coatings for drug delivery applications; coatings for mold and die; shape memory alloys

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Guest Editor
Metal Processing R&D Department, Metal Industries Research & Development Centre, Kaohsiung City 81160, Taiwan
Interests: metal forming; FEA; high entropy alloy; computational materials science; plasticity theory

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Guest Editor
Department of Materials Science and Engineering, National Cheng Kung University , No.1, University Road, Tainan City 701, Taiwan
Interests: material analysis (phase and microstructure); novel fabrication; crystal growth; sintering

Special Issue Information

Dear Colleagues,

Additive manufacturing (AM) of complex-shaped and hard-to-form metals has attracted considerable interest during the last decade. Hard-to-form metals (HFMs), such as high entropy alloy (HEA), have great potential applications in refraction, energy, biomedical, aerospace industrial, etc. AM technology provides great capabilities for hard-to-form metal manufacture, whereas many technical challenges remain for materials scientists and engineers to overcome.

Due to the ongoing manufacture challenges and scientific findings of hard-to-form metals and high entropy alloys of AM, we invite researchers to contribute to this Special Issue on high entropy alloys, as well as hard-to-form metals and alloys of additive manufacture. This issue is focused on the raw materials, processes, simulation, properties, post-treatments, and applications of AMed HEA and HFM materials. In this issue, we aim to bring scientists of all fields together to advance the field further and explore untouched potential and applications.

The potential topics include but are not limited to:

- Raw materials of HEA and HFM for AM;

- New/modified AM technologies;

- Microstructures, properties, and applications of AMed HEA and HFM;

- AM process and control;

- Modeling and simulation of AM technologies;

- Post-treatments of AMed HEA and HFM.

Prof. Dr. Meng-Hsiu Tsai
Prof. Dr. Shih-Fu Ou
Dr. Yen-Ju Chen
Dr. Chia-Ming Yang
Guest Editors

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Keywords

  • high entropy alloy
  • hard-to-form metals
  • additive manufacture
  • crack
  • defects
  • phase transformation
  • mechanical properties

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Published Papers (1 paper)

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Research

12 pages, 2597 KiB  
Article
Effects of Annealing on the Microstructure and Wear Resistance of Laser Cladding CrFeMoNbTiW High-Entropy Alloy Coating
by Qiang Shen, Yan Li, Jing Zhao, Dezheng Liu and Yongsheng Yang
Crystals 2021, 11(9), 1096; https://doi.org/10.3390/cryst11091096 - 9 Sep 2021
Cited by 9 | Viewed by 2584
Abstract
In this study, a CrFeMoNbTiW high-entropy alloy (HEA) coating was prepared on a Q245R steel (American grade: SA515 Gr60) substrate by means of laser cladding. The effects of annealing temperature on the microstructure and wear resistance of the CrFeMoNbTiW coating were investigated using [...] Read more.
In this study, a CrFeMoNbTiW high-entropy alloy (HEA) coating was prepared on a Q245R steel (American grade: SA515 Gr60) substrate by means of laser cladding. The effects of annealing temperature on the microstructure and wear resistance of the CrFeMoNbTiW coating were investigated using X-ray diffraction (XRD), a scanning electron microscope (SEM), a Vickers hardness tester and a roller friction wear tester. The results showed that the coating was mainly composed of body-centered cubic (BCC) solid solution and face-centered cubic (FCC) structural (Nb,Ti)C carbides prior to annealing, exhibiting an interdendritic structure and needlelike dendritic crystal structure with average microhardness of 682 HV0.2. The coarsening of the dendrite arms increased gradually after a 10-h long annealing treatment at 800 °C, 900 °C and 1000 °C, and a small amount of Laves phase was produced. After annealing, the highest microhardness value of the as-annealed coating reached 1176 HV0.2, which represents an increase of approximately 72.5% compared to that of the as-deposit coating. The wear resistance testing results imply that this type of coating retains good wear resistance following the annealing treatment and that its wear resistance increases in proportion to the annealing temperature in a range from 800 °C to 1000 °C. Full article
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