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A novel Ti/TiAl laminated composite with excellent shear properties
Zhanxing Chen1, Jian Ji1, Yupeng Wang2
1School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou, 450046, China.
This study prepared titanium/titanium-aluminum laminated composites using spark plasma sintering. The novel Ti/TiAl composites exhibit excellent shear properties due to their unique in-situ reaction transition interface.
Area of Science:
- Materials Science
- Metallurgical Engineering
Background:
- Titanium-aluminum (TiAl) alloys are critical for high-temperature applications.
- Developing advanced composites with enhanced mechanical properties is essential for aerospace and automotive industries.
Purpose of the Study:
- To prepare and characterize Ti/TiAl laminated composites.
- To investigate the effect of different intermediate layers on shear strength and fracture behavior.
- To understand the role of the in-situ reaction transition interface in enhancing shear performance.
Main Methods:
- Spark plasma sintering (SPS) of alternately stacked Ti and TiAl powders.
- Microstructural analysis of the laminated composites.
- Interlayer shear testing to determine shear strength and fracture mechanisms.
Main Results:
- Successfully synthesized Ti/TiAl laminated composites with Ti, Ti3Al, and TiAl layers.
- Achieved ultimate shear strengths of approximately 622 MPa (Ti layer), 466 MPa (TiAl layer), and 328 MPa (Ti3Al layer).
- Observed distinct crack propagation behaviors influenced by the intermediate layer composition and properties.
Conclusions:
- The in-situ reaction transition interface is key to the excellent shear properties of the novel Ti/TiAl laminated composites.
- The ductile Ti layer effectively releases shear stress through plastic deformation, enhancing overall composite performance.
- Understanding these interfacial mechanisms provides a pathway for designing advanced high-performance materials.
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