Lightweight Multiprincipal Element Alloys with Excellent Mechanical Properties at Room and Cryogenic Temperatures
Lightweight multiprincipal element alloys (MPEAs) are promising candidates for potential application as engineering materials due to their high strength and low density. In this work, lightweight Ti<sub>70</sub>Al<sub>15</sub>V<sub>15</sub> and Ti<sub>80<...
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MDPI AG
2022-12-01
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| author | Gongxi Lin Ruipeng Guo Xiaohui Shi Lina Han Junwei Qiao |
| author_facet | Gongxi Lin Ruipeng Guo Xiaohui Shi Lina Han Junwei Qiao |
| author_sort | Gongxi Lin |
| collection | DOAJ |
| description | Lightweight multiprincipal element alloys (MPEAs) are promising candidates for potential application as engineering materials due to their high strength and low density. In this work, lightweight Ti<sub>70</sub>Al<sub>15</sub>V<sub>15</sub> and Ti<sub>80</sub>Al<sub>10</sub>V<sub>10</sub> MPEAs were fabricated via vacuum arc melting. The phases of the Ti<sub>70</sub>Al<sub>15</sub>V<sub>15</sub> alloys consisted of a BCC phase and a small amount of B2 phase while the Ti<sub>80</sub>Al<sub>10</sub>V<sub>10</sub> alloys displayed a dual-phase structure with BCC and HCP phases. The different phase compositions led to differences in their mechanical properties. When the temperature changed from 298 K to 77 K, the strength of the alloys further increased and maintained a certain plasticity. This is attributed to the increasing lattice friction stress at cryogenic temperature. TEM observation demonstrated that dislocation played a crucial role in plastic deformation for both the Ti<sub>70</sub>Al<sub>15</sub>V<sub>15</sub> and Ti<sub>80</sub>Al<sub>10</sub>V<sub>10</sub> alloys. In addition, Ti<sub>80</sub>Al<sub>10</sub>V<sub>10</sub> exhibited significant work-hardening capabilities. By analyzing the strengthening mechanism of the alloys, the theoretical yield strength was calculated, and the results agreed with the experimental values. The present results provide new insight into developing lightweight MPEAs containing Ti and Al. |
| first_indexed | 2024-03-09T16:48:57Z |
| format | Article |
| id | doaj.art-78d09f6dfb204b5bad362db1cba16064 |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-03-09T16:48:57Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj.art-78d09f6dfb204b5bad362db1cba160642023-11-24T14:42:47ZengMDPI AGEntropy1099-43002022-12-012412177710.3390/e24121777Lightweight Multiprincipal Element Alloys with Excellent Mechanical Properties at Room and Cryogenic TemperaturesGongxi Lin0Ruipeng Guo1Xiaohui Shi2Lina Han3Junwei Qiao4College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaLightweight multiprincipal element alloys (MPEAs) are promising candidates for potential application as engineering materials due to their high strength and low density. In this work, lightweight Ti<sub>70</sub>Al<sub>15</sub>V<sub>15</sub> and Ti<sub>80</sub>Al<sub>10</sub>V<sub>10</sub> MPEAs were fabricated via vacuum arc melting. The phases of the Ti<sub>70</sub>Al<sub>15</sub>V<sub>15</sub> alloys consisted of a BCC phase and a small amount of B2 phase while the Ti<sub>80</sub>Al<sub>10</sub>V<sub>10</sub> alloys displayed a dual-phase structure with BCC and HCP phases. The different phase compositions led to differences in their mechanical properties. When the temperature changed from 298 K to 77 K, the strength of the alloys further increased and maintained a certain plasticity. This is attributed to the increasing lattice friction stress at cryogenic temperature. TEM observation demonstrated that dislocation played a crucial role in plastic deformation for both the Ti<sub>70</sub>Al<sub>15</sub>V<sub>15</sub> and Ti<sub>80</sub>Al<sub>10</sub>V<sub>10</sub> alloys. In addition, Ti<sub>80</sub>Al<sub>10</sub>V<sub>10</sub> exhibited significant work-hardening capabilities. By analyzing the strengthening mechanism of the alloys, the theoretical yield strength was calculated, and the results agreed with the experimental values. The present results provide new insight into developing lightweight MPEAs containing Ti and Al.https://www.mdpi.com/1099-4300/24/12/1777lightweight multiprincipal element alloysmicrostructuremechanical propertiesstrengthening mechanism |
| spellingShingle | Gongxi Lin Ruipeng Guo Xiaohui Shi Lina Han Junwei Qiao Lightweight Multiprincipal Element Alloys with Excellent Mechanical Properties at Room and Cryogenic Temperatures Entropy lightweight multiprincipal element alloys microstructure mechanical properties strengthening mechanism |
| title | Lightweight Multiprincipal Element Alloys with Excellent Mechanical Properties at Room and Cryogenic Temperatures |
| title_full | Lightweight Multiprincipal Element Alloys with Excellent Mechanical Properties at Room and Cryogenic Temperatures |
| title_fullStr | Lightweight Multiprincipal Element Alloys with Excellent Mechanical Properties at Room and Cryogenic Temperatures |
| title_full_unstemmed | Lightweight Multiprincipal Element Alloys with Excellent Mechanical Properties at Room and Cryogenic Temperatures |
| title_short | Lightweight Multiprincipal Element Alloys with Excellent Mechanical Properties at Room and Cryogenic Temperatures |
| title_sort | lightweight multiprincipal element alloys with excellent mechanical properties at room and cryogenic temperatures |
| topic | lightweight multiprincipal element alloys microstructure mechanical properties strengthening mechanism |
| url | https://www.mdpi.com/1099-4300/24/12/1777 |
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