Microstructure evolution of SiCf/TiMoNb heterogeneous core reinforced Ti2AlNb-based composites
SiC fiber-reinforced metal matrix composites (MMCs) show promise for aerospace but face temperature limits, with Ti2AlNb-based composites capped at 750 °C due to interfacial reactions. Refractory multi-principal element alloys (MPEAs) offer high-temperature potential. This study explores SiCf/TiMoNb...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-05-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S026412752500382X |
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| Summary: | SiC fiber-reinforced metal matrix composites (MMCs) show promise for aerospace but face temperature limits, with Ti2AlNb-based composites capped at 750 °C due to interfacial reactions. Refractory multi-principal element alloys (MPEAs) offer high-temperature potential. This study explores SiCf/TiMoNb-reinforced Ti2AlNb-based composites, focusing on microstructure and interfacial evolution during processing. It was found that the precursor wires matrix exhibited a single BCC phase with primary TiC at the C/TiMoNb interface. Following hot isostatic pressing (HIP), the composite matrix retained a BCC structure, with extensive dislocations, and TiC particles precipitates at grain boundaries. The formation of a 0.55 µm TiC reaction layer at the C/TiMoNb interface was observed and minor Ti5Si3 phase formed nearby the TiC layer. The Ti2AlNb capsule displayed an α2 + B2 + O lamellar structure, with excellent bonding to the TiMoNb matrix. The interdiffusion area evolved into two distinct regions: a single B2 phase, equiaxed α2 grains with lamellar B2 + O structures. Crystallographic orientation relationships were summarized. Numerous < 111 > dislocations in the B2 phase, deformation bands in the α2 phase, and (110) twins in the O phase were observed. This work provides critical insights into microstructural evolution during HIP, offering a foundation for understanding failure mechanisms and optimizing the mechanical performance of these advanced composites. |
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| ISSN: | 0264-1275 |