Microstructure and Wear Resistance of TiB2/7075 Composites Produced via Rheocasting
In this study, TiB<sub>2</sub>/7075 aluminum matrix composites were prepared via in situ synthesis. It was found that TiB<sub>2</sub> particles are mainly quadrate. Large TiB<sub>2</sub> particles (1–2 μm) agglomerate at grain boundaries, but most of the particles...
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MDPI AG
2020-08-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/10/8/1068 |
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| author | Qian Gao Bin Yang Guisheng Gan Yujie Zhong Liang Sun Wenyan Zhai Wei Qiang Shiqing Wang Yongxin Lu |
| author_facet | Qian Gao Bin Yang Guisheng Gan Yujie Zhong Liang Sun Wenyan Zhai Wei Qiang Shiqing Wang Yongxin Lu |
| author_sort | Qian Gao |
| collection | DOAJ |
| description | In this study, TiB<sub>2</sub>/7075 aluminum matrix composites were prepared via in situ synthesis. It was found that TiB<sub>2</sub> particles are mainly quadrate. Large TiB<sub>2</sub> particles (1–2 μm) agglomerate at grain boundaries, but most of the particles are on the submicron scale. Adding 4.5 wt.% TiB<sub>2</sub> particles effectively optimizes α-Al grains in the 7075 aluminum alloy. By combining in situ reinforcing particles with the self-stirring effect of a serpentuator, rheocasting of the 7075 aluminum alloy was achieved in a simple and economical way. The average grain size of the specimen after rheocasting and heat treatment was smaller than 33 μm, and the shape factors were greater than 0.85. The wear resistance of the 4.5 wt.% TiB<sub>2</sub>/7075 aluminum matrix composite that was prepared via rheocasting and gravity casting was tested with loads of 30, 60, 90, and 120 N at a friction speed of 0.15 m/s for a duration of 30 min. Because of the optimized microstructure and increased hardness, the wear resistance of the 4.5 wt.% TiB<sub>2</sub>/7075 aluminum matrix composite was significantly better than that of the 7075 aluminum alloy, and the wear resistance of the rheocast TiB<sub>2</sub>/7075 aluminum matrix composite was better than that of the gravity cast one. |
| first_indexed | 2024-03-10T17:49:19Z |
| format | Article |
| id | doaj.art-ded8db4f9c7e4f108d1b9ae181898902 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T17:49:19Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-ded8db4f9c7e4f108d1b9ae1818989022023-11-20T09:26:13ZengMDPI AGMetals2075-47012020-08-01108106810.3390/met10081068Microstructure and Wear Resistance of TiB2/7075 Composites Produced via RheocastingQian Gao0Bin Yang1Guisheng Gan2Yujie Zhong3Liang Sun4Wenyan Zhai5Wei Qiang6Shiqing Wang7Yongxin Lu8School of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaCollaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, ChinaSchool of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaSchool of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaSchool of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaSchool of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaSchool of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaSchool of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaIn this study, TiB<sub>2</sub>/7075 aluminum matrix composites were prepared via in situ synthesis. It was found that TiB<sub>2</sub> particles are mainly quadrate. Large TiB<sub>2</sub> particles (1–2 μm) agglomerate at grain boundaries, but most of the particles are on the submicron scale. Adding 4.5 wt.% TiB<sub>2</sub> particles effectively optimizes α-Al grains in the 7075 aluminum alloy. By combining in situ reinforcing particles with the self-stirring effect of a serpentuator, rheocasting of the 7075 aluminum alloy was achieved in a simple and economical way. The average grain size of the specimen after rheocasting and heat treatment was smaller than 33 μm, and the shape factors were greater than 0.85. The wear resistance of the 4.5 wt.% TiB<sub>2</sub>/7075 aluminum matrix composite that was prepared via rheocasting and gravity casting was tested with loads of 30, 60, 90, and 120 N at a friction speed of 0.15 m/s for a duration of 30 min. Because of the optimized microstructure and increased hardness, the wear resistance of the 4.5 wt.% TiB<sub>2</sub>/7075 aluminum matrix composite was significantly better than that of the 7075 aluminum alloy, and the wear resistance of the rheocast TiB<sub>2</sub>/7075 aluminum matrix composite was better than that of the gravity cast one.https://www.mdpi.com/2075-4701/10/8/1068TiB<sub>2</sub>/7075 compositerheocastingsemi-solidwear resistance |
| spellingShingle | Qian Gao Bin Yang Guisheng Gan Yujie Zhong Liang Sun Wenyan Zhai Wei Qiang Shiqing Wang Yongxin Lu Microstructure and Wear Resistance of TiB2/7075 Composites Produced via Rheocasting Metals TiB<sub>2</sub>/7075 composite rheocasting semi-solid wear resistance |
| title | Microstructure and Wear Resistance of TiB2/7075 Composites Produced via Rheocasting |
| title_full | Microstructure and Wear Resistance of TiB2/7075 Composites Produced via Rheocasting |
| title_fullStr | Microstructure and Wear Resistance of TiB2/7075 Composites Produced via Rheocasting |
| title_full_unstemmed | Microstructure and Wear Resistance of TiB2/7075 Composites Produced via Rheocasting |
| title_short | Microstructure and Wear Resistance of TiB2/7075 Composites Produced via Rheocasting |
| title_sort | microstructure and wear resistance of tib2 7075 composites produced via rheocasting |
| topic | TiB<sub>2</sub>/7075 composite rheocasting semi-solid wear resistance |
| url | https://www.mdpi.com/2075-4701/10/8/1068 |
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