Thermal stability and decomposition behavior of Cr2TiAlC2 at elevated temperature |
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| Affiliation: | 1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China;2. School of Mechanical Engineering, Hunan University of Technology, Zhuzhou, 412007, China;3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, China;4. Aluminum Valley Industrial Technology Institute, 888 Aluminum Valley Building, Heban 2nd Road, Zouping, 256200, China;1. College of Mechanical Engineering, Donghua University, Shanghai, 201620, China;2. Institute of Artificial Intelligence, Donghua University, Shanghai, 201620, China;1. School of Mechanical Engineering, Xinjiang University, Wulumuqi, 830000, China;2. Key Laboratory of Automobile Materials, School of Materials Science and Engineering, Jilin University, Changchun, 130022, China;1. School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, China;2. Institute of Aero Engine Research, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, China;3. Institute of Aerospace Materials and Processing Technology, Beijing, 100076, China;4. Frontier Research Institute of Innovative Science and Technology, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, China;5. Tianmu Mountain Laboratory, Hangzhou, 311100, China;1. Laser Group, School of Mechanical Engineering, Hubei University of Technology, Wuhan, 430068, China;2. Hubei Key Laboratory of Modern Manufacturing Quality Engineering, Wuhan, 430068, China;3. Institute of Laser and Optoelectronic Intelligent Manufacturing, Wenzhou University, Wenzhou, 325000, China;1. College of Science, Ningbo University of Technology, Ningbo, 315211, PR China;2. Institute of Micro/Nano Materials and Devices, Ningbo University of Technology, Ningbo, 315211, PR China;3. Zhejiang Fuyan New Material Co.,Ltd, Zhejiang Province, 317199, PR China |
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| Abstract: | As a good candidate for high-temperature uses in aerospace vehicles, the thermal behaviors of Cr2TiAlC2 in three different circumstances were studied. It exhibited good thermal-structural stability up to 1450 °C in flowing argon atmosphere, while heat treated to 1300 °C in Ar + CO/CO2 atmosphere, it decomposed to Cr2AlC resulting from the Ti consumption. The thermal stability in vacuum was also studied by in-situ X-ray diffraction methods, which showed a new decomposition mechanism based on the multi-scale bonding characteristics in its crystal structure. To deep understand the relationship between the crystal structure, chemical composition, and high-temperature behaviors, the hierarchical bonding characteristics were revealed. The out-plane ordering of M atoms together with their apparent negativity differences may result in the large M ? C bonding strength, i.e., increased Cr–C strength and decreased Ti–C strength. The present work based on Cr2TiAlC2 helps better understand the composition-structure-property relationship of Mn+1AXn compounds. |
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| Keywords: | MAX phase Decomposition Structure-property relationship Interface structure |
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