Influence of alloying elements on mechanical and electronic properties of NbMoTaWX (X = Cr, Zr, V, Hf and Re) refractory high entropy alloys

Tong, Yonggang; Bai, Linhui; Liang, Xiubing; Chen, Yongxiong; Zhang, Zhibing; Liu, Jian; Li, Yejun; Hu, Yongle

doi:10.1016/j.intermet.2020.106928

Cited by 85 publications

(14 citation statements)

References 45 publications

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“…The refractory high-entropy alloys with four or more group elements are usually designed based on Ta-Nb-Mo-W, Ti-Nb-Zr-Hf, Ti-Nb-V-Zr, Ti-Nb-Mo-V, Ti-Ta-Nb-Zr, and Ti-Ta-Nb-V, as shown in Figure 4 . In addition, alloys can contain Al or Si to reduce the alloy density to improve Bio-HEAs performance, and there are also studies to improve the wear performance of Bio-HEAs by adding Cr elements ( Tong et al, 2020 ).…”

Section: Component Design Theory and Simulation Studiesmentioning

confidence: 99%

“…The energy band, total and partial densities of states, and charge density were calculated to investigate the strength and ductility enhancement mechanism of NbMoTaW alloy using Ti alloying. Tong et al ( Tong et al, 2020 ) used DFT calculations to simulate the effects of Ti, Zr, Cr, V, Hf, and Re additions on the properties of NbMoTaW HEAs and further analyzed the role played by various strengthening mechanisms. Chen et al ( Chen S. M. et al, 2022 ) used the first-principles approach combined with a thermodynamic model to study phase decomposition in alloys by considering HEA as various pseudo-binary systems, as shown in Figure 10 , which predicts that phase decomposition in Hf-Nb-Ti-Zr alloys with a BCC structure occurs at temperatures below the critical temperature of 1298 K. The HEA decomposes most favorably into NbTa-rich and HfZr-rich BCC phases, while the BCC-rich HfZr phase is transferred to the hexagonal compact stacking structure (HCP) phase at low temperatures.…”

Section: Component Design Theory and Simulation Studiesmentioning

confidence: 99%

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Bio-high entropy alloys: Progress, challenges, and opportunities

Feng

Tang

Liu

et al. 2022

Front. Bioeng. Biotechnol.

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With the continuous progress and development in biomedicine, metallic biomedical materials have attracted significant attention from researchers. Due to the low compatibility of traditional metal implant materials with the human body, it is urgent to develop new biomaterials with excellent mechanical properties and appropriate biocompatibility to solve the adverse reactions caused by long-term implantation. High entropy alloys (HEAs) are nearly equimolar alloys of five or more elements, with huge compositional design space and excellent mechanical properties. In contrast, biological high-entropy alloys (Bio-HEAs) are expected to be a new bio-alloy for biomedicine due to their excellent biocompatibility and tunable mechanical properties. This review summarizes the composition system of Bio-HEAs in recent years, introduces their biocompatibility and mechanical properties of human bone adaptation, and finally puts forward the following suggestions for the development direction of Bio-HEAs: to improve the theory and simulation studies of Bio-HEAs composition design, to quantify the influence of composition, process, post-treatment on the performance of Bio-HEAs, to focus on the loss of Bio-HEAs under actual service conditions, and it is hoped that the clinical application of the new medical alloy Bio-HEAs can be realized as soon as possible.

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Section: Component Design Theory and Simulation Studiesmentioning

confidence: 99%

Section: Component Design Theory and Simulation Studiesmentioning

confidence: 99%

Bio-high entropy alloys: Progress, challenges, and opportunities

Feng

Tang

Liu

et al. 2022

Front. Bioeng. Biotechnol.

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“…Yurchenko and Senkov et al [18,19] have pointed out that Zr addition causes the formation of Zr and Al-rich intermetallic compounds and increases the compressive yield strength of RHEAs by solution and precipitation strengthening effects. Tong et al [20] has reported that Zr alloying improves both the strength and ductility of RHEAs by forming Zr-Zr metallic bonds. Ji et al [21] has developed a series of Ti 65−x Ta 25 Nb 10 Zr x RHEAs with single BCC phase, and indicated that Zr addition dramatically alleviates the atomic-size and modulus mismatches and therefore ameliorates the mechanical properties of the alloys.…”

Section: Introductionmentioning

confidence: 99%

Zr alloying effects on the microstructure, compression performance and oxidation resistance of refractory high entropy alloys

Zhang

2022

Mater. Res. Express

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Three refractory high entropy alloys (RHEAs) with nominal compositions of Mo0.5NbHf0.25CrZrxTiAl (x = 0, 0.5, 1, mole ratio) were prepared by vacuum non-consumable arc melting technology. The influences of Zr addition on the microstructure, compressive performance and oxidation resistance at 1473 K of RHEAs were investigated and evaluated integrally. The results show that the three RHEAs are all composed of BCC1, BCC2 and Laves phases. With increasing the Zr content, the microstructure of RHEA has gradually become BCC1+BCC2 eutectics, and also the area fraction of BCC2 phase exhibits a rising trend. Both peak stresses are displayed at the strains of near 0.03 and 0.08 respectively in the compressive stress-strain curves of the three RHEAs. On the whole, the compressive yield strength of RHEA shows an increasing trend with Zr addition. The oxide scales of the three RHEAs all possess good adhesion and obviously layered structures. The different oxidation products are distributed in their oxide scales and internal oxidation zones. The oxidation resistance of RHEA is dramatically degraded due to the decreased compactness of the oxide scale with Zr addition.

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“…Subsequently, high yield strength and elongation up to about 1.11 GPa and 27.66% respectively were exhibited due to the presence of an ordered oxygen complex. Besides, many other researchers, such as Jayaraj [9], SaadSheik [26], Zhang Yong [27], Tong [28], etc., have developed lots of studies on high-temperature resistant HEAs.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Wire Arc Additively Manufactured MoNbTaWTi High Entropy Alloys

Liu¹,

Li²,

Du³

et al. 2021

Materials

Self Cite

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High-temperature resistant high-entropy alloys (HEAs) have attracted extensive attention due to their excellent thermodynamic stability and mechanical properties, especially at high temperatures. However, a highly effective method for large-size HEAs is still desirable but challengeable. This research reported a facile yet effective strategy for MoNbTaWTi HEAs via in-situ wire arc additive manufacturing (WAAM). The wire was MoNbTaWTi cable-type welding wire (CTWW) consisting of one center wire and seven twisted peripheral wires. Then, additive manufacturing of MoNbTaWTi high entropy alloys (HEAs) was accomplished, and various analytical techniques studied the microstructures and mechanical properties of the overlaying formed layers. X-ray diffraction showed the overlaying formed layers to contain a single disordered BCC solid solution phase with high-temperature structural stability. In addition, the single-phase BCC structure was maintained from 0 to 1400 °C. The bottom of the overlaying formed layers was made of columnar cellular structure, and the upper part resembled “cauliflower-like” fine dendrite and equiaxed crystal structure. The hardness of the overlaying formed layers averaged 533 HV0.2 at room temperature. At 1000 °C, the hardness was around 110 HV1, close to the value of Inconel 718 alloy (125 HV1). The compressive strength of the overlaying formed alloy layers displayed no sensitivity towards change in temperature from 500 to 1000 °C. As the temperature rose from 500 to 1000 °C, the compressive strength changed from 629 to 602 MPa, equivalent to only a 27 MPa decrease. The latter was much higher than the strength of Inconel 718 alloy at the same temperature (200 MPa).

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Influence of alloying elements on mechanical and electronic properties of NbMoTaWX (X = Cr, Zr, V, Hf and Re) refractory high entropy alloys

Cited by 85 publications

References 45 publications

Bio-high entropy alloys: Progress, challenges, and opportunities

Bio-high entropy alloys: Progress, challenges, and opportunities

Zr alloying effects on the microstructure, compression performance and oxidation resistance of refractory high entropy alloys

Microstructure and Mechanical Properties of Wire Arc Additively Manufactured MoNbTaWTi High Entropy Alloys

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