Novel metastable engineering in single-phase high-entropy alloy
To improve the mechanical properties of high-entropy alloys (HEAs) and expand the application range of metastable engineering, the NbZrTiTa alloy was researched. The results show that this alloy exhibits uniform element distribution and a metastable single-phase body-centered cubic (BCC) structure....
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2019-01-01
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| Series: | Materials & Design |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S026412751830858X |
| _version_ | 1818528944015540224 |
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| author | Ruixin Wang Yu Tang Shun Li Hong Zhang Yicong Ye Li'an Zhu Yuanlin Ai Shuxin Bai |
| author_facet | Ruixin Wang Yu Tang Shun Li Hong Zhang Yicong Ye Li'an Zhu Yuanlin Ai Shuxin Bai |
| author_sort | Ruixin Wang |
| collection | DOAJ |
| description | To improve the mechanical properties of high-entropy alloys (HEAs) and expand the application range of metastable engineering, the NbZrTiTa alloy was researched. The results show that this alloy exhibits uniform element distribution and a metastable single-phase body-centered cubic (BCC) structure. During loading, element diffusion occurs, and then the TiZr-rich and TaNb-rich regions form. The increased Ti and Zr content reduces the stability of the BCC structure and leads to in-situ structure transformation in the TiZr-rich region. Element diffusion and structure transformation improve ductility by absorbing the loading work and releasing internal stresses. Furthermore, interface strengthening caused by the formation of the dual-phase region and the coherent nano-precipitation due to the compositional fluctuations together enhance the strength. The co-contribution of various metastable-induced strengthening and toughening mechanisms distinguishes the strength and ductility of the single-phase NbZrTiTa HEA from those of all the reported refractory systems. More importantly, the successful utilization of the novel metastable engineering induced by element diffusion in single-phase HEA provides a useful guide to design HEAs and other structural materials. Keywords: High-entropy alloy, Metastability engineering, Phase transformation, Element diffusion, Mechanical property |
| first_indexed | 2024-12-11T06:56:39Z |
| format | Article |
| id | doaj.art-d8dc06323f074458a084d19a22f1755e |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-11T06:56:39Z |
| publishDate | 2019-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-d8dc06323f074458a084d19a22f1755e2022-12-22T01:16:44ZengElsevierMaterials & Design0264-12752019-01-01162256262Novel metastable engineering in single-phase high-entropy alloyRuixin Wang0Yu Tang1Shun Li2Hong Zhang3Yicong Ye4Li'an Zhu5Yuanlin Ai6Shuxin Bai7College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaCorresponding authors.; College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaCollege of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaCollege of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaCollege of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaCollege of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaCollege of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaCorresponding authors.; College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaTo improve the mechanical properties of high-entropy alloys (HEAs) and expand the application range of metastable engineering, the NbZrTiTa alloy was researched. The results show that this alloy exhibits uniform element distribution and a metastable single-phase body-centered cubic (BCC) structure. During loading, element diffusion occurs, and then the TiZr-rich and TaNb-rich regions form. The increased Ti and Zr content reduces the stability of the BCC structure and leads to in-situ structure transformation in the TiZr-rich region. Element diffusion and structure transformation improve ductility by absorbing the loading work and releasing internal stresses. Furthermore, interface strengthening caused by the formation of the dual-phase region and the coherent nano-precipitation due to the compositional fluctuations together enhance the strength. The co-contribution of various metastable-induced strengthening and toughening mechanisms distinguishes the strength and ductility of the single-phase NbZrTiTa HEA from those of all the reported refractory systems. More importantly, the successful utilization of the novel metastable engineering induced by element diffusion in single-phase HEA provides a useful guide to design HEAs and other structural materials. Keywords: High-entropy alloy, Metastability engineering, Phase transformation, Element diffusion, Mechanical propertyhttp://www.sciencedirect.com/science/article/pii/S026412751830858X |
| spellingShingle | Ruixin Wang Yu Tang Shun Li Hong Zhang Yicong Ye Li'an Zhu Yuanlin Ai Shuxin Bai Novel metastable engineering in single-phase high-entropy alloy Materials & Design |
| title | Novel metastable engineering in single-phase high-entropy alloy |
| title_full | Novel metastable engineering in single-phase high-entropy alloy |
| title_fullStr | Novel metastable engineering in single-phase high-entropy alloy |
| title_full_unstemmed | Novel metastable engineering in single-phase high-entropy alloy |
| title_short | Novel metastable engineering in single-phase high-entropy alloy |
| title_sort | novel metastable engineering in single phase high entropy alloy |
| url | http://www.sciencedirect.com/science/article/pii/S026412751830858X |
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