Core-shell structured titanium-nitrogen alloys with high strength, high thermal stability and good plasticity
Y S Zhang1, Y H Zhao2, W Zhang1
1Northwest Institute for Nonferrous Metal Research, Xi'an Shanxi 710016, China.
Scientific Reports
|January 7, 2017
Summary
Researchers developed novel core-shell titanium alloys using spark plasma sintering. These advanced materials achieve high strength, plasticity, and thermal stability, overcoming common property trade-offs in materials science.
Area of Science:
- Materials Science
- Metallurgy
- Nanotechnology
Background:
- Multifunctional materials are crucial for industry, but properties like strength, ductility, and thermal stability often conflict.
- Nanostructured materials offer high strength but suffer from poor ductility and thermal stability.
Purpose of the Study:
- To synthesize bulk core-shell structured titanium alloys with enhanced multifunctional properties.
- To overcome the trade-off between strength, plasticity, and thermal stability in titanium alloys.
Main Methods:
- Spark plasma sintering (SPS) of nitrided Ti particles.
- Fabrication of bulk core-shell structured Ti alloys with distinct Ti cores and Ti-N shells.
Main Results:
- Achieved high yield strength (~1.4 GPa) comparable to nanostructured materials.
- Demonstrated high thermal stability (over 1100°C) due to hard Ti-N shells.
- Exhibited good plasticity (12% fracture plasticity) attributed to soft Ti cores.
Conclusions:
- The core-shell structure provides a viable design strategy for advanced materials.
- This approach enables simultaneous enhancement of strength, plasticity, and thermal stability.
- Offers a pathway to superior multifunctional titanium alloys.
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