High temperature micromechanical behavior of Ti2AlN particle reinforced TiAl based composites investigated by in-situ high-energy X-ray diffraction
The high-temperature compressive property of Ti2AlN/TiAl composites, which are promising lightweight materials for high-temperature applications, was investigated. In situ high-energy X-ray diffraction (HEXRD) was utilized to analyze the micromechanical behavior at different deformation stages. It i...
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| Main Authors: | , , , , , |
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| Format: | article |
| Language: | EN |
| Published: |
Elsevier
2021
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| Subjects: | |
| Online Access: | https://doaj.org/article/d256b1e2e7134c0e863e94e59a66550c |
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| Summary: | The high-temperature compressive property of Ti2AlN/TiAl composites, which are promising lightweight materials for high-temperature applications, was investigated. In situ high-energy X-ray diffraction (HEXRD) was utilized to analyze the micromechanical behavior at different deformation stages. It is determined {110}γ fiber texture firstly formed at work hardening stage and {0002}H fiber texture appeared at softening stage. The micro-deformation sequences were related to crystallographic orientations where [200]//LD, [202]//LD oriented γ grains were easier to work-hardening while [002]//LD, [110]//LD oriented γ grains presented hardening-softening transformation characteristic. The lattice strain wave of [0002]//LD oriented H grain reflected an interesting atomic-scale ripples meanwhile [10_13]//LD oriented H phase presented a unique interface-dislocation mechanism. A significantly higher stress level in H phase demonstrates its strong bearing capacity. Our investigations establish a relationship between macroscopic deformation of composite and the microscopic elastic/plastic deformation of each component meanwhile provide in-depth understanding of the cooperative deformation characteristics in Ti2AlN/TiAl composites. |
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