Microstructure and Mechanical Properties of Novel High-Strength, Low-Activation Wx(TaVZr)100−x (x = 5, 10, 15, 20, 25) Refractory High Entropy Alloys

Zhang, Jingsai; Chen, Shun Hua; Liu, Jiaqin; Qing, Zhenhua; Wu, Yucheng

doi:10.3390/e24101342

Cited by 11 publications

(5 citation statements)

References 57 publications

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“…As shown in Figure 3, V was distributed uniformly in the whole region, while other elements occur to different degrees of segregation due to their different melting points [32]. W was enriched in the dendrite region, particularly the white region, which is similar to previous studies [26,27,33]. This may result from its high melting point and limited solubility.…”

Section: Microstructure Of (Tivcrzr) 100−x W X Rheassupporting

confidence: 79%

Microstructure and Mechanical Properties of High-Specific-Strength (TiVCrZr)100−xWx (x = 5, 10, 15 and 20) Refractory High-Entropy Alloys

Wang

Zhang

et al. 2023

Entropy

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With the increasing demand for high-specific-strength materials for high-temperature applications, particularly in the aerospace field, novel (TiVCrZr)100−xWx (x = 5, 10, 15 and 20) refractory high-entropy alloys (RHEAs) were developed. The phase formation, microstructure, and mechanical properties were studied. The (TiVCrZr)100−xWx RHEAs exhibit a relatively high specific strength and low density compared with the W-containing RHEAs and most of the W-free RHEAs. In (TiVCrZr)100−xWx RHEAs, Laves, BCC and Ti-rich phases are formed, where the Laves phase is the major phase, and the volume fraction of the BCC phase increases with increasing W content. (TiVCrZr)100−xWx RHEAs exhibit dendrite structures, where W is enriched in the dendrite region, and increasing W-rich precipitations corresponding to the BCC phase are observed. The improvement of the strength and hardness of RHEAs is mainly attributed to the evolution of the microstructure and corresponding strengthening effect of W. The empirical parameters and calculated phase diagram were investigated, which further explain and verify the formation and variation of phases. The present findings give more insights into the formation of multi phases in (TiVCrZr)100−xWx RHEAs, and explore their application potential in the aerospace industry and nuclear reactors due to their high specific strength and low-activation constituent elements.

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Section: Microstructure Of (Tivcrzr) 100−x W X Rheassupporting

confidence: 79%

Microstructure and Mechanical Properties of High-Specific-Strength (TiVCrZr)100−xWx (x = 5, 10, 15 and 20) Refractory High-Entropy Alloys

Wang

Zhang

et al. 2023

Entropy

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“…The use of HEAs as catalysts is a promising research field. The "Materials Genome Initiative" accelerates the upgrading and blossoming of basic materials, such as metallic/non-metallic materials and alloys/HEAs [85]. Therefore, it is expected that correlation studies on HEAs will become increasingly favored, and the following aspects are worth noting.…”

Section: Discussionmentioning

confidence: 99%

High-temperature shock synthesis of high-entropy-alloy nanoparticles for catalysis

Liu

Tian

Han

et al. 2023

Chinese Journal of Catalysis

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“…6. As can be seen, although there are some river lines and smooth facets indicating the appearance of transgranular fractures, the intergranular dominated fracture was observed in the HEA due to the formation of hard and brittle HS phase in the intergrain regions resulting in the weakness of the intergrain regions (27,46). In addition, the formation of tear edges in the fracture surface of the HEA shows relatively ductile behavior of the corresponding regions, which is consistent with what has been found in previous studies (32,47).…”

Section: The Evolution Of Mechanical Propertiesmentioning

confidence: 99%

Microstructural Evolution and Mechanical Properties of Y Added CoCrFeNi High-entropy Alloys Produced by Arc-melting

Polat,

Kotan

2024

Hittite Journal of Science and Engineering

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The CoCrFeNi high entropy alloy (HEA) with face-centered cubic (FCC) crystal structure exhibits excellent ductility values even at cryogenic temperatures. However, since this HEA is relatively weak in strength, it may not meet the requirements of industrial applications in terms of strength-ductility trade-off. Therefore, the systematic addition of yttrium (Y) into CoCrFeNi HEA was investigated in the present study to increase the strength by solid solution and second phase strengthening. The HEAs were produced by vacuum arc melting, suction casting, and subsequent homogenization at 1150 °C for 24 h. The structural development of the HEAs was investigated by using the X-ray diffraction (XRD) technique revealing the formation of a solid solution phase and Ni3Y-type hexagonal structure (HS) second phase. The corresponding microstructure of the HEAs was examined under a scanning electron microscope (SEM) revealing the transformation of the microstructure from elongated grains to nearly equiaxed grains with the increase of Y content from 2 at. % to 4 at. %. The mechanical properties of the HEAs were investigated by using hardness and compression tests. The results exhibited a dramatic increase in the hardness from 143 (±2) HV to 335 (±7) HV and in the yield strength from 130 MPa to 1025 MPa with 4 at. % Y addition. Our study has revealed that the addition of rare earth Y element results in further development in the strength of the CoCrFeNi for potential engineering applications.

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Microstructure and Mechanical Properties of Novel High-Strength, Low-Activation Wx(TaVZr)100−x (x = 5, 10, 15, 20, 25) Refractory High Entropy Alloys

Cited by 11 publications

References 57 publications

Microstructure and Mechanical Properties of High-Specific-Strength (TiVCrZr)100−xWx (x = 5, 10, 15 and 20) Refractory High-Entropy Alloys

Microstructure and Mechanical Properties of High-Specific-Strength (TiVCrZr)100−xWx (x = 5, 10, 15 and 20) Refractory High-Entropy Alloys

High-temperature shock synthesis of high-entropy-alloy nanoparticles for catalysis

Microstructural Evolution and Mechanical Properties of Y Added CoCrFeNi High-entropy Alloys Produced by Arc-melting

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