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Plasma Polishing as a New Polishing Option to Reduce the Surface Roughness of Porous Titanium Alloy for 3D Printing
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A novel nano-particle strengthened titanium alloy with exceptional specific strength
Aniket K Dutt1, Bharat Gwalani1, Vedavyas Tungala1
1Center for Friction Stir Processing, Department of Materials Science and Engineering, University of North Texas, Denton, TX, 76207, USA.
Scientific Reports
|August 15, 2019
Summary
This study microstructurally tailored Ti-6Al-2Sn-4Zr-6Mo (Ti6246) titanium alloy using friction stir processing (FSP). The resulting alloy exhibits exceptional specific strength, offering significant weight reduction potential for structural applications.
Area of Science:
- Materials Science
- Metallurgy
- Mechanical Engineering
Background:
- Growing demand for lightweight, high-strength materials driven by ecological and economic factors.
- Titanium alloys are crucial for applications requiring high performance and weight savings.
- Need for advanced microstructural engineering to enhance material properties.
Purpose of the Study:
- To microstructurally tailor the Ti-6Al-2Sn-4Zr-6Mo (Ti6246) titanium alloy using friction stir processing (FSP).
- To investigate the phase transformations and resulting microstructure responsible for enhanced mechanical properties.
- To evaluate the specific strength and potential applications of the processed alloy.
Main Methods:
- Friction Stir Processing (FSP) to modify the alloy's microstructure.
- Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) for microstructural analysis.
- Synchrotron X-ray Diffraction (XRD) to study phase transformations.
Main Results:
- FSP transformed the as-received bimodal microstructure into a modulated microstructure with fine acicular α″-laths and nano precipitates.
- Detailed understanding of the phase transformation sequence leading to the modulated microstructure.
- Achieved specific strength close to 450 MPa m³/mg, representing a 22%-85% improvement over existing metallic materials.
Conclusions:
- The novel nanoparticle-strengthened Ti alloy processed via FSP offers superior specific strength.
- This advanced titanium alloy presents a viable alternative to conventional structural alloys for significant weight reduction.
- The microstructural tailoring approach demonstrates a pathway for developing next-generation high-performance materials.
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