Effect of Heat Treatment on the Microstructure and Mechanical Properties of a Ti-TiAl Laminate Composite
The effect of an innovative two-step heat-treatment process on the microstructure and mechanical properties of a Ti-TiAl laminate composite fabricated by hot-pack rolling was studied in this paper. After heat treatment, the fracture toughness of the composite was enhanced and the elongation of the c...
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MDPI AG
2023-04-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/4/708 |
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| author | Wei Sun Ning Cui Yongjun Su Shuling Zhang Tiewei Xu Xiaopeng Wang Fantao Kong |
| author_facet | Wei Sun Ning Cui Yongjun Su Shuling Zhang Tiewei Xu Xiaopeng Wang Fantao Kong |
| author_sort | Wei Sun |
| collection | DOAJ |
| description | The effect of an innovative two-step heat-treatment process on the microstructure and mechanical properties of a Ti-TiAl laminate composite fabricated by hot-pack rolling was studied in this paper. After heat treatment, the fracture toughness of the composite was enhanced and the elongation of the composite was almost twice that of the initial one. These changes were due to the dislocations and substructures stored in the Ti-43Al-9V alloy being decreased, the microstructure of the DsTi700 alloy turning to a duplex structure, the acicular α<sub>2</sub> phase being precipitated at the interfacial region and the residual stresses stored in interfacial region being eliminated. The precipitation of dual-scale silicides was the main reason for the slightly reduced strength. Compared with the initial composite, the tensile strength of the heat-treated composite at 25° and 700° only reduced by 2.7% and 4%, respectively. The primary annealing temperature had a huge impact on the mechanical properties of the composite. However, with the change in secondary annealing temperature, the mechanical properties of the composite were not changed significantly. After heat treatment at 940–960 °C/2 h/AC + 725–750 °C/6 h/AC, the composite might possess high, comprehensive mechanical properties. |
| first_indexed | 2024-03-11T04:44:52Z |
| format | Article |
| id | doaj.art-9c7a96554b7d41119038a1b0ad530dfc |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-11T04:44:52Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-9c7a96554b7d41119038a1b0ad530dfc2023-11-17T20:26:34ZengMDPI AGMetals2075-47012023-04-0113470810.3390/met13040708Effect of Heat Treatment on the Microstructure and Mechanical Properties of a Ti-TiAl Laminate CompositeWei Sun0Ning Cui1Yongjun Su2Shuling Zhang3Tiewei Xu4Xiaopeng Wang5Fantao Kong6School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, ChinaSchool of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, ChinaDepartment of Mechanics, College of Engineering, Lishui University, Lishui 323000, ChinaSchool of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, ChinaSchool of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, ChinaState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, ChinaState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, ChinaThe effect of an innovative two-step heat-treatment process on the microstructure and mechanical properties of a Ti-TiAl laminate composite fabricated by hot-pack rolling was studied in this paper. After heat treatment, the fracture toughness of the composite was enhanced and the elongation of the composite was almost twice that of the initial one. These changes were due to the dislocations and substructures stored in the Ti-43Al-9V alloy being decreased, the microstructure of the DsTi700 alloy turning to a duplex structure, the acicular α<sub>2</sub> phase being precipitated at the interfacial region and the residual stresses stored in interfacial region being eliminated. The precipitation of dual-scale silicides was the main reason for the slightly reduced strength. Compared with the initial composite, the tensile strength of the heat-treated composite at 25° and 700° only reduced by 2.7% and 4%, respectively. The primary annealing temperature had a huge impact on the mechanical properties of the composite. However, with the change in secondary annealing temperature, the mechanical properties of the composite were not changed significantly. After heat treatment at 940–960 °C/2 h/AC + 725–750 °C/6 h/AC, the composite might possess high, comprehensive mechanical properties.https://www.mdpi.com/2075-4701/13/4/708heat treatmentmicrostructuremechanical propertieslaminate composite |
| spellingShingle | Wei Sun Ning Cui Yongjun Su Shuling Zhang Tiewei Xu Xiaopeng Wang Fantao Kong Effect of Heat Treatment on the Microstructure and Mechanical Properties of a Ti-TiAl Laminate Composite Metals heat treatment microstructure mechanical properties laminate composite |
| title | Effect of Heat Treatment on the Microstructure and Mechanical Properties of a Ti-TiAl Laminate Composite |
| title_full | Effect of Heat Treatment on the Microstructure and Mechanical Properties of a Ti-TiAl Laminate Composite |
| title_fullStr | Effect of Heat Treatment on the Microstructure and Mechanical Properties of a Ti-TiAl Laminate Composite |
| title_full_unstemmed | Effect of Heat Treatment on the Microstructure and Mechanical Properties of a Ti-TiAl Laminate Composite |
| title_short | Effect of Heat Treatment on the Microstructure and Mechanical Properties of a Ti-TiAl Laminate Composite |
| title_sort | effect of heat treatment on the microstructure and mechanical properties of a ti tial laminate composite |
| topic | heat treatment microstructure mechanical properties laminate composite |
| url | https://www.mdpi.com/2075-4701/13/4/708 |
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