Microstructure and Mechanical Properties of Novel High-Strength, Low-Activation W<sub>x</sub>(TaVZr)<sub>100−x</sub> (x = 5, 10, 15, 20, 25) Refractory High Entropy Alloys
In this work, novel high-strength, low-activation W<sub>x</sub>(TaVZr)<sub>100−x</sub> (x = 5, 10, 15, 20, 25) refractory high entropy alloys (RHEAs) were prepared by vacuum arc melting. Their microstructure, compressive mechanical properties, hardness, and fracture morpholog...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | Entropy |
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| Online Access: | https://www.mdpi.com/1099-4300/24/10/1342 |
| _version_ | 1797473499410857984 |
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| author | Jingsai Zhang Shunhua Chen Jiaqin Liu Zhenhua Qing Yucheng Wu |
| author_facet | Jingsai Zhang Shunhua Chen Jiaqin Liu Zhenhua Qing Yucheng Wu |
| author_sort | Jingsai Zhang |
| collection | DOAJ |
| description | In this work, novel high-strength, low-activation W<sub>x</sub>(TaVZr)<sub>100−x</sub> (x = 5, 10, 15, 20, 25) refractory high entropy alloys (RHEAs) were prepared by vacuum arc melting. Their microstructure, compressive mechanical properties, hardness, and fracture morphology were investigated and analyzed. The results show that the RHEAs possess a disordered BCC phase, ordered Laves phase, and Zr-rich HCP phase. Their dendrite structures were observed, and the distribution of dendrites became gradually more dense with an increase in W content. The RHEAs demonstrate high strength and hardness, with these properties being higher than in most reported tungsten-containing RHEAs. For example, the typical W<sub>20</sub>(TaVZr)<sub>80</sub> RHEA has a yield strength of 1985 MPa and a hardness of 636 <i>HV</i>, respectively. The improvement in terms of strength and hardness are mainly due to solid solution strengthening and the increase in dendritic regions. During compression, with the increase in the applied load, the fracture behavior of RHEAs changed from initial intergranular fractures to a mixed mode combining both intergranular and transgranular fractures. |
| first_indexed | 2024-03-09T20:15:21Z |
| format | Article |
| id | doaj.art-446979c4b9d647569ab3ad3586a3a1f4 |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-03-09T20:15:21Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj.art-446979c4b9d647569ab3ad3586a3a1f42023-11-24T00:02:02ZengMDPI AGEntropy1099-43002022-09-012410134210.3390/e24101342Microstructure and Mechanical Properties of Novel High-Strength, Low-Activation W<sub>x</sub>(TaVZr)<sub>100−x</sub> (x = 5, 10, 15, 20, 25) Refractory High Entropy AlloysJingsai Zhang0Shunhua Chen1Jiaqin Liu2Zhenhua Qing3Yucheng Wu4School of Mechanical Engineering, Hefei University of Technology, Hefei 230009, ChinaSchool of Mechanical Engineering, Hefei University of Technology, Hefei 230009, ChinaSchool of Mechanical Engineering, Hefei University of Technology, Hefei 230009, ChinaSchool of Mechanical Engineering, Hefei University of Technology, Hefei 230009, ChinaNational-Local Joint Engineering Research Centre of Nonferrous Metals and Processing Technology, Hefei 230009, ChinaIn this work, novel high-strength, low-activation W<sub>x</sub>(TaVZr)<sub>100−x</sub> (x = 5, 10, 15, 20, 25) refractory high entropy alloys (RHEAs) were prepared by vacuum arc melting. Their microstructure, compressive mechanical properties, hardness, and fracture morphology were investigated and analyzed. The results show that the RHEAs possess a disordered BCC phase, ordered Laves phase, and Zr-rich HCP phase. Their dendrite structures were observed, and the distribution of dendrites became gradually more dense with an increase in W content. The RHEAs demonstrate high strength and hardness, with these properties being higher than in most reported tungsten-containing RHEAs. For example, the typical W<sub>20</sub>(TaVZr)<sub>80</sub> RHEA has a yield strength of 1985 MPa and a hardness of 636 <i>HV</i>, respectively. The improvement in terms of strength and hardness are mainly due to solid solution strengthening and the increase in dendritic regions. During compression, with the increase in the applied load, the fracture behavior of RHEAs changed from initial intergranular fractures to a mixed mode combining both intergranular and transgranular fractures.https://www.mdpi.com/1099-4300/24/10/1342refractory high entropy alloymicrostructurestrengthlow-activationfracture |
| spellingShingle | Jingsai Zhang Shunhua Chen Jiaqin Liu Zhenhua Qing Yucheng Wu Microstructure and Mechanical Properties of Novel High-Strength, Low-Activation W<sub>x</sub>(TaVZr)<sub>100−x</sub> (x = 5, 10, 15, 20, 25) Refractory High Entropy Alloys Entropy refractory high entropy alloy microstructure strength low-activation fracture |
| title | Microstructure and Mechanical Properties of Novel High-Strength, Low-Activation W<sub>x</sub>(TaVZr)<sub>100−x</sub> (x = 5, 10, 15, 20, 25) Refractory High Entropy Alloys |
| title_full | Microstructure and Mechanical Properties of Novel High-Strength, Low-Activation W<sub>x</sub>(TaVZr)<sub>100−x</sub> (x = 5, 10, 15, 20, 25) Refractory High Entropy Alloys |
| title_fullStr | Microstructure and Mechanical Properties of Novel High-Strength, Low-Activation W<sub>x</sub>(TaVZr)<sub>100−x</sub> (x = 5, 10, 15, 20, 25) Refractory High Entropy Alloys |
| title_full_unstemmed | Microstructure and Mechanical Properties of Novel High-Strength, Low-Activation W<sub>x</sub>(TaVZr)<sub>100−x</sub> (x = 5, 10, 15, 20, 25) Refractory High Entropy Alloys |
| title_short | Microstructure and Mechanical Properties of Novel High-Strength, Low-Activation W<sub>x</sub>(TaVZr)<sub>100−x</sub> (x = 5, 10, 15, 20, 25) Refractory High Entropy Alloys |
| title_sort | microstructure and mechanical properties of novel high strength low activation w sub x sub tavzr sub 100 x sub x 5 10 15 20 25 refractory high entropy alloys |
| topic | refractory high entropy alloy microstructure strength low-activation fracture |
| url | https://www.mdpi.com/1099-4300/24/10/1342 |
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