Microstructure, mechanical properties and corrosion resistance of high-level hard Nb-Ta-W and Nb-Ta-W-Hf multi-principal element alloy thin films

Zhou, Yiyong; Zhang, Zhibin; Yao, Wen Bin; Liang, Xiubing

doi:10.1016/j.jallcom.2022.166000

Cited by 10 publications

(11 citation statements)

References 61 publications

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“…The sluggish diffusion effect of W-containing RHEAs makes an alloy’s surface less susceptible to diffusion after corrosion in corrosive environments. Studies have shown that W-containing RHEAs can exhibit excellent corrosion resistance in acidic and salt solutions, such as sulfuric acid [ 20 , 159 ] and NaCl solution [ 135 , 160 , 161 , 162 , 163 , 164 , 165 ]. Since the corrosion resistance is significantly related to the elemental compositions, regulating the elemental compositions of RHEAs can improve the corrosion resistance.…”

Section: Functional Properties Of W-containing Rheasmentioning

confidence: 99%

“…For example, the addition of Ta, Mo, Cr and Al with excellent corrosion resistance can form stable passivation films on the alloy’s surface, reducing the corrosion rate and improve the corrosion resistance. Additionally, the corrosion resistance of RHEA thin films prepared by MS has been shown to be significantly higher than that of bulk RHEA samples prepared by VAM [ 20 , 135 , 165 , 166 ].…”

Section: Functional Properties Of W-containing Rheasmentioning

confidence: 99%

“…On the other hand, the corrosion resistance of W-containing RHEAs in NaCl solutions has been studied. Zhang et al [ 165 ] prepared a series of NbTaWHf x RHEA films using the MS technique. As shown in Figure 18 b, the corrosion resistance of all the RHEA films in a 3.5 wt.% NaCl solution was significantly enhanced compared to the 304 stainless steel.…”

Section: Functional Properties Of W-containing Rheasmentioning

confidence: 99%

“…( b ) NbTaWHf x RHEA films and 304 stainless steel in a 3.5 wt.% NaCl solution. Adapted from [ 20 , 165 ] with permissions from Elsevier.…”

Section: Figurementioning

confidence: 99%

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Recent Advances in W-Containing Refractory High-Entropy Alloys—An Overview

Chen

Chen²,

Liu³

et al. 2022

Entropy

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During the past decade, refractory high-entropy alloys (RHEA) have attracted great attention of scientists, engineers and scholars due to their excellent mechanical and functional properties. The W-containing RHEAs are favored by researchers because of their great application potential in aerospace, marine and nuclear equipment and other high-temperature, corrosive and irradiated fields. In this review, more than 150 W-containing RHEAs are summarized and compared. The preparation techniques, microstructure and mechanical properties of the W-containing RHEAs are systematically outlined. In addition, the functional properties of W-containing RHEAs, such as oxidation, corrosion, irradiation and wear resistance have been elaborated and analyzed. Finally, the key issues faced by the development of W-containing RHEAs in terms of design and fabrication techniques, strengthening and deformation mechanisms, and potential functional applications are proposed and discussed. Future directions for the investigation and application of W-containing RHEAs are also suggested. The present work provides useful guidance for the development, processing and application of W-containing RHEAs and the RHEA components.

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Section: Functional Properties Of W-containing Rheasmentioning

confidence: 99%

Section: Functional Properties Of W-containing Rheasmentioning

confidence: 99%

Section: Functional Properties Of W-containing Rheasmentioning

confidence: 99%

“…( b ) NbTaWHf x RHEA films and 304 stainless steel in a 3.5 wt.% NaCl solution. Adapted from [ 20 , 165 ] with permissions from Elsevier.…”

Section: Figurementioning

confidence: 99%

See 2 more Smart Citations

Recent Advances in W-Containing Refractory High-Entropy Alloys—An Overview

Chen

Chen²,

Liu³

et al. 2022

Entropy

View full text Add to dashboard Cite

show abstract

“…demonstrated the higher corrosion resistance of Ta coatings with I corr even down to 4.5 × 10 –9 A cm –2 in higher pH solutions (pH = 3). Ta alloy coatings also exhibited high anticorrosion with I corr of 9 × 10 –9 A cm –2 in NaCl solution . Nevertheless, the development of new alloys with higher corrosion resistance and higher conductivity is mainly dependent on the trial and error method; the development period might be longer with higher cost.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Screening of Transition Metal Alloys with High Corrosion Resistance: The Case of Ta-Based Alloys as an Example

Lv,

Gao,

Luo

et al. 2024

J. Phys. Chem. C

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Proton exchange membrane water electrolysis (PEMWE) is one of the potential strategies to generate green hydrogen energy, and anticorrosive coatings are mandatory to protect the bipolar plates, an important component of PEMWE. However, it is still challenging to explore the high-corrosion-resistance coatings by trial and error. In this paper, the corrosion properties of Ta and its alloys as examples are studied theoretically; in particular, the influences of crystal planes and alloying elements on the corrosion resistance have been studied systematically. Four descriptors, surface energy density ξ, work function τ, electronic descriptor ψ, and d band center ς, are proposed to screen the high-corrosion-resistance coatings. It is found that the electronic descriptor ψ can well predict the atomic escape energy and thus the corrosion resistance of Ta-based binary alloys with the coefficient of determination R 2 of 0.804 and 0.949, respectively. Among them, TaW and TaCr alloys exhibit the most excellent corrosion resistance with the lowest I corr (<1.59 × 10 −7 A cm −2 ) and the highest U corr (> −0.011 V vs SHE) because of the largest −IpCOHP values and thus the strongest binding strength. The screening method is also applicable to the other alloys.

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The effects of grain size and temperature on mechanical properties of CoCrNi medium-entropy alloy

2023

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In this paper, the molecular dynamics method was used to analyze mechanical properties and microscopic deformation mechanisms of CoCrNi medium-entropy alloy with different average grain sizes at various temperatures. Its elastic modulus and Poisson's ratio were first calculated by the constant pressure molecular dynamics method. It is found that the elastic modulus increases with the average grain size increasing and is reduced at elevated temperatures. However, its Poisson's ratio decreases with the average grain size increasing and is not sensitive to temperatures.Simulations of simple tension were carried out and the results show that: (1) when the average grain size exceeds 15.2 nm, its yield stress and maximum flow stress decreased with the average grain size raising (Hall-Petch relationship), in this situation it is speculated that the dislocation slips and deformation twins within the grains dominate the plastic deformation; (2) when the grain size is smaller than 15.2 nm, the two stress parameters instead increase with the average grain size increasing (Inverse Hall-Petch relationship), such a plastic deformation mechanism is understood mainly due to grain boundaries migrations and grain rotations. In the end, as temperature effects on microscopic deformation mechanisms are concerned, it is found that more dislocations tend to be plugged near grain boundaries which have lower mobility at lower temperatures. Accordingly, the two stress parameters increase as the temperature decreases.

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Microstructure, mechanical properties and corrosion resistance of high-level hard Nb-Ta-W and Nb-Ta-W-Hf multi-principal element alloy thin films

Cited by 10 publications

References 61 publications

Recent Advances in W-Containing Refractory High-Entropy Alloys—An Overview

Recent Advances in W-Containing Refractory High-Entropy Alloys—An Overview

Theoretical Screening of Transition Metal Alloys with High Corrosion Resistance: The Case of Ta-Based Alloys as an Example

The effects of grain size and temperature on mechanical properties of CoCrNi medium-entropy alloy

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