High-Performance Multicomponent Alloys

Abstract submission deadline

closed (20 December 2023)

Manuscript submission deadline

closed (29 February 2024)

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Topic Information

Dear Colleagues,

Multicomponent alloys are classes of materials that consist of a large number of alloying elements in various proportions. One well-known alloy grade is the Cantor alloy including an equal amount of five kinds of principal elements. Recently, multicomponent alloys have frequently been named high-entropy alloys (HEAs) which have gradually attracted the attention of the community. For example, single-phase FCC entropy alloys exhibit excellent damage tolerance and impact toughness at low temperatures, while BCC entropy alloys exhibit excellent high-temperature mechanical properties at elevated temperatures. Furthermore, dual-phase HEAs with a non-equal proportion of principle elements are designed to overcome the strength-ductility trade-off. The dual-phase HEAs have been reported to hold a combination of excellent good ductility and yield strength, performing better than the single-phase HEAs as well as many kinds of metallic materials. Besides HEAs, multicomponent alloys can also include a wide range of engineering materials, e.g., high-performance high-alloy steels, TWIP steels, Ni-/Co-based superb alloys, etc. Metallic materials produced by advanced processing, e.g., additive manufacturing (AM), can also be included in this alloy category.

The current Topic Collection includes broad research topics referring to the composition, microstructure, and property correlation of multicomponent alloys. Various aspects can include, but are not limited to, material design using conventional and state-of-the-art methodologies, e.g., CALPHAD, Integrated Computational Materials Engineering (ICME), machine learning-based AI method, etc.; multiscale material characterizations from micro- to nano-scale; advanced material processing using, e.g., AM; control of defect including non-metallic inclusions in the large-scale high-performance alloys, etc.

Authors from academia and industry are therefore invited to submit their original research and/or review contributions on advances in high-performance multicomponent alloys to the current Special Issue.

Dr. Xusheng Yang
Dr. Honghui Wu
Dr. Wangzhong Mu
Topic Editors

Keywords

Participating Journals

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
Crystals crystals	2.4	4.2	2011	10.8 Days	CHF 2100
Entropy entropy	2.1	4.9	1999	22.4 Days	CHF 2600
Materials materials	3.1	5.8	2008	15.5 Days	CHF 2600
Metals metals	2.6	4.9	2011	16.5 Days	CHF 2600
Nanomaterials nanomaterials	4.4	8.5	2010	13.8 Days	CHF 2900

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Published Papers (5 papers)

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All Crystals Entropy Materials Metals Nanomaterials

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16 pages, 8901 KiB  

Open AccessArticle

Photocatalytic Hydrogen Evolution of TiZrNbHfTaO_x High-Entropy Oxide Synthesized by Mechano-Thermal Method

by Ömer Güler, Mustafa Boyrazlı, Muhammet Gökhan Albayrak, Seval Hale Güler, Tatsumi Ishihara and Kaveh Edalati

Materials 2024, 17(4), 853; https://doi.org/10.3390/ma17040853 - 11 Feb 2024

Cited by 10 | Viewed by 1703

Abstract

One of the most promising solutions to slow down CO₂ emissions is the use of photocatalysis to produce hydrogen as a clean fuel. However, the efficiency of the photocatalysts is not at the desired level, and they usually need precious metal co-catalysts [...] Read more.

One of the most promising solutions to slow down CO₂ emissions is the use of photocatalysis to produce hydrogen as a clean fuel. However, the efficiency of the photocatalysts is not at the desired level, and they usually need precious metal co-catalysts for reactions. In this study, to achieve efficient photocatalytic hydrogen production, a high-entropy oxide was synthesized by a mechano-thermal method. The synthesized high-entropy oxide had a bandgap of 2.45 eV, which coincided with both UV and visible light regions. The material could successfully produce hydrogen from water under light, but the main difference to conventional photocatalysts was that the photocatalysis proceeded without a co-catalyst addition. Hydrogen production increased with increasing time, and at the end of the 3 h period, 134.76 µmol/m² h of hydrogen was produced. These findings not only introduce a new method for producing high-entropy photocatalysts but also confirm the high potential of high-entropy photocatalysts for hydrogen production without the need for precious metal co-catalysts. Full article

(This article belongs to the Topic High-Performance Multicomponent Alloys)

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28 pages, 11105 KiB  

Open AccessReview

Multi-Scale Microstructural Tailoring and Associated Properties of Press-Hardened Steels: A Review

by Zhuo Cheng, Mengjie Gao, Jinyue Liu, Shuize Wang, Guilin Wu, Junheng Gao, Honghui Wu and Xinping Mao

Materials 2023, 16(10), 3799; https://doi.org/10.3390/ma16103799 - 17 May 2023

Cited by 7 | Viewed by 2138

Abstract

High-strength press-hardened steels (PHS) are highly desired in the automotive industry to meet the requirement of carbon neutrality. This review aims to provide a systematic study of the relationship between multi-scale microstructural tailoring and the mechanical behavior and other service performance of PHS. [...] Read more.

High-strength press-hardened steels (PHS) are highly desired in the automotive industry to meet the requirement of carbon neutrality. This review aims to provide a systematic study of the relationship between multi-scale microstructural tailoring and the mechanical behavior and other service performance of PHS. It begins with a brief introduction to the background of PHS, followed by an in-depth description of the strategies used to enhance their properties. These strategies are categorized into traditional Mn-B steels and novel PHS. For traditional Mn-B steels, extensive research has verified that the addition of microalloying elements can refine the microstructure of PHS, resulting in improved mechanical properties, hydrogen embrittlement resistance, and other service performance. In the case of novel PHS, recent progress has principally demonstrated that the novel composition of steels coupling with innovative thermomechanical processing can obtain multi-phase structure and superior mechanical properties compared with traditional Mn-B steels, and their effect on oxidation resistance is highlighted. Finally, the review offers an outlook on the future development of PHS from the perspective of academic research and industrial applications. Full article

(This article belongs to the Topic High-Performance Multicomponent Alloys)

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13 pages, 5696 KiB  

Open AccessArticle

Thermoelectric Properties of PbS Doped with Bi₂S₃ and Cu₂S Prepared by Hydrothermal Synthesis and Spark Plasma Sintering

by Wei Wang, Cong Xian, Yun Ou, Zhijian He and Shuhong Xie

Crystals 2023, 13(5), 764; https://doi.org/10.3390/cryst13050764 - 4 May 2023

Cited by 2 | Viewed by 1930

Abstract

Hierarchical PbS powders doped with different contents of Bi₂S₃ and Cu₂S were synthesized using the hydrothermal method. Subsequently, the powders were subjected to spark plasma sintering (SPS) for consolidation into bulk ceramics. X-ray photoelectron spectroscopy results showed that [...] Read more.

Hierarchical PbS powders doped with different contents of Bi₂S₃ and Cu₂S were synthesized using the hydrothermal method. Subsequently, the powders were subjected to spark plasma sintering (SPS) for consolidation into bulk ceramics. X-ray photoelectron spectroscopy results showed that Bi₂S₃ and Cu₂S were doped into PbS successfully. The effect of doping with different Bi₂S₃ and Cu₂S contents on thermoelectric performance was investigated systematically. The results showed that pure PbS was an n-type semiconductor, and Bi₂S₃ doping or Bi₂S₃-Cu₂S co-doping could decrease the thermal conductivity of PbS effectively. PbS doped with 1% Bi₂S₃ exhibited a moderate Seebeck coefficient, high electric conductivity, and low thermal conductivity simultaneously, thus attaining a maximum figure of merit ZT of 0.55 at 773 K. PbS doped with 1% Bi₂S₃-1% Cu₂S exhibited an enhanced power factor and reduced thermal conductivity at an elevated temperature; the maximum ZT value obtained at 773 K was 0.83, which is more than twice that of pure PbS at 758 K (0.29), as a result. Full article

(This article belongs to the Topic High-Performance Multicomponent Alloys)

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14 pages, 12703 KiB  

Open AccessArticle

Effect of Mg on Inclusion and High Cycle Fatigue Behavior in Titanium Microalloyed Beam Steel

by Zhijun Gao, Guangfei Pan, Shuize Wang, Yu Song, Honghui Wu and Xinping Mao

Metals 2023, 13(4), 760; https://doi.org/10.3390/met13040760 - 13 Apr 2023

Cited by 3 | Viewed by 1494

Abstract

In this paper, the fatigue behavior of titanium microalloyed beam steels were studied by high cycle fatigue test and fatigue crack growth rate test. The effect of Mg addition on the fatigue behavior in titanium microalloyed beam steel was systematically analyzed. According to [...] Read more.

In this paper, the fatigue behavior of titanium microalloyed beam steels were studied by high cycle fatigue test and fatigue crack growth rate test. The effect of Mg addition on the fatigue behavior in titanium microalloyed beam steel was systematically analyzed. According to the experimental results, the addition of magnesium can effectively modify the inclusions by reducing the size of Al₂O₃ and TiN and promoting the formation of finer complex inclusions with a MgO·Al₂O₃ core in titanium microalloyed high-strength beam steel. The number of inclusions in the experimental steels had far less of an impact on the fatigue characteristic than inclusion size. With the heterogeneous nucleation effect of MgO·Al₂O₃, the inclusions are refined after the Mg addition. The tensile strength of Beam-2 steel decreased by approximately 54 MPa, while its fatigue strength increased by about 33 MPa, showing favorable fatigue resistance. These findings are essential for optimize the fatigue properties of titanium microalloy steel and promoting the development of automobile beam steel with excellent fatigue properties. Full article

(This article belongs to the Topic High-Performance Multicomponent Alloys)

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13 pages, 11772 KiB  

Open AccessArticle

Study on Corrosion Behavior and Mechanism of Ultrahigh-Strength Hot-Stamping Steel Based on Traditional and Compact Strip-Production Processes

by Guoqiang Ma, Yimian Chen, Shuize Wang, Honghui Wu, Junheng Gao, Guilin Wu and Xinping Mao

Materials 2023, 16(8), 3064; https://doi.org/10.3390/ma16083064 - 13 Apr 2023

Cited by 1 | Viewed by 1785

Abstract

Hot-stamping steel is a type of high-strength steel that is mainly used in key safety components such as the front and rear bumpers, A-pillars, and B-pillars of vehicles. There are two methods of producing hot-stamping steel, i.e., the traditional process and the near [...] Read more.

Hot-stamping steel is a type of high-strength steel that is mainly used in key safety components such as the front and rear bumpers, A-pillars, and B-pillars of vehicles. There are two methods of producing hot-stamping steel, i.e., the traditional process and the near net shape of compact strip production (CSP) process. To assess the potential risks of producing hot-stamping steel using CSP, the microstructure and mechanical properties, and especially the corrosion behavior were focused on between the traditional and CSP processes. The original microstructure of hot-stamping steel produced by the traditional process and the CSP process is different. After quenching, the microstructures transform into full martensite, and their mechanical properties meet the 1500 MPa grade. Corrosion tests showed that the faster the quenching speeds, the smaller the corrosion rate of the steel. The corrosion current density changes from 15 to 8.6 μA·cm⁻². The corrosion resistance of hot-stamping steel produced by the CSP process is slightly better than that of traditional processes, mainly since the inclusion size and distribution density of CSP-produced steel were both smaller than those of the traditional process. The reduction of inclusions reduces the number of corrosion sites and improves the corrosion resistance of steel. Full article

(This article belongs to the Topic High-Performance Multicomponent Alloys)

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