Microstructure and Mechanical Properties of High Relative Density γ-TiAl Alloy Using Irregular Pre-Alloyed Powder
Preparing high relative density γ-TiAl alloy by pressure-less sintering at low-cost has always been a challenge. Therefore, a new kind of non-spherical pre-alloyed TiAl powder was prepared by the reaction of TiH<sub>2</sub> powder and Al powder at 800 °C to fabricate high-density Ti-48Al...
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MDPI AG
2021-04-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/4/635 |
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| author | Mengjie Yan Fang Yang Boxin Lu Cunguang Chen Yanli Sui Zhimeng Guo |
| author_facet | Mengjie Yan Fang Yang Boxin Lu Cunguang Chen Yanli Sui Zhimeng Guo |
| author_sort | Mengjie Yan |
| collection | DOAJ |
| description | Preparing high relative density γ-TiAl alloy by pressure-less sintering at low-cost has always been a challenge. Therefore, a new kind of non-spherical pre-alloyed TiAl powder was prepared by the reaction of TiH<sub>2</sub> powder and Al powder at 800 °C to fabricate high-density Ti-48Al alloy via pressure-less sintering. The oxygen content was controlled to below 1800 ppm by using coarse Al powder (~120 μm). The sintered densities ranged from 92.1% to 97.5% with sintering temperature varying from 1300 °C to 1450 °C. The microstructure of the sintered compact was greatly influenced by the sintering temperature. The as-sintered samples had a near-γ structure at 1350 °C, a duplex structure at 1400 °C, and a nearly lamellar structure at 1450 °C. To achieve full densification, non-capsule hot isostatic pressing was performed on the 1350 °C and 1400 °C sintered samples. As a result, high compressive strengths of 2241 MPa and 1931MPa were obtained, which were higher than the existing Ti-48Al alloys. |
| first_indexed | 2024-03-10T12:21:46Z |
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| id | doaj.art-faed2212525b48178a55c40aaac1dccd |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T12:21:46Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj.art-faed2212525b48178a55c40aaac1dccd2023-11-21T15:28:17ZengMDPI AGMetals2075-47012021-04-0111463510.3390/met11040635Microstructure and Mechanical Properties of High Relative Density γ-TiAl Alloy Using Irregular Pre-Alloyed PowderMengjie Yan0Fang Yang1Boxin Lu2Cunguang Chen3Yanli Sui4Zhimeng Guo5Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaInnovation Group of Marine Engineering Materials and Corrosion Control, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaPreparing high relative density γ-TiAl alloy by pressure-less sintering at low-cost has always been a challenge. Therefore, a new kind of non-spherical pre-alloyed TiAl powder was prepared by the reaction of TiH<sub>2</sub> powder and Al powder at 800 °C to fabricate high-density Ti-48Al alloy via pressure-less sintering. The oxygen content was controlled to below 1800 ppm by using coarse Al powder (~120 μm). The sintered densities ranged from 92.1% to 97.5% with sintering temperature varying from 1300 °C to 1450 °C. The microstructure of the sintered compact was greatly influenced by the sintering temperature. The as-sintered samples had a near-γ structure at 1350 °C, a duplex structure at 1400 °C, and a nearly lamellar structure at 1450 °C. To achieve full densification, non-capsule hot isostatic pressing was performed on the 1350 °C and 1400 °C sintered samples. As a result, high compressive strengths of 2241 MPa and 1931MPa were obtained, which were higher than the existing Ti-48Al alloys.https://www.mdpi.com/2075-4701/11/4/635γ-TiAl alloypressureless sinteringrelative densitymicrostructure |
| spellingShingle | Mengjie Yan Fang Yang Boxin Lu Cunguang Chen Yanli Sui Zhimeng Guo Microstructure and Mechanical Properties of High Relative Density γ-TiAl Alloy Using Irregular Pre-Alloyed Powder Metals γ-TiAl alloy pressureless sintering relative density microstructure |
| title | Microstructure and Mechanical Properties of High Relative Density γ-TiAl Alloy Using Irregular Pre-Alloyed Powder |
| title_full | Microstructure and Mechanical Properties of High Relative Density γ-TiAl Alloy Using Irregular Pre-Alloyed Powder |
| title_fullStr | Microstructure and Mechanical Properties of High Relative Density γ-TiAl Alloy Using Irregular Pre-Alloyed Powder |
| title_full_unstemmed | Microstructure and Mechanical Properties of High Relative Density γ-TiAl Alloy Using Irregular Pre-Alloyed Powder |
| title_short | Microstructure and Mechanical Properties of High Relative Density γ-TiAl Alloy Using Irregular Pre-Alloyed Powder |
| title_sort | microstructure and mechanical properties of high relative density γ tial alloy using irregular pre alloyed powder |
| topic | γ-TiAl alloy pressureless sintering relative density microstructure |
| url | https://www.mdpi.com/2075-4701/11/4/635 |
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