Related Experiment Video
Updated: Jun 19, 2026
11:17
Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
Published on: February 9, 2017
In situ synchrotron high-energy X-ray diffraction analysis on phase transformations in Ti-Al alloys processed by
Klaus Dieter Liss1, Ross E Whitfield, Wei Xu
1The Bragg Institute, Australian Nuclear Science and Technology Organisation, Menai, NSW, Australia. kdl@ansto.gov.au
Journal of Synchrotron Radiation
|October 22, 2009
Summary
This study explores aluminum-titanium (Al-Ti) powder consolidation using equal-channel angular pressing. Phase evolution during heating reveals the formation of stable intermetallic compounds, offering insights into Al-Ti alloy development.
Area of Science:
- Materials Science
- Metallurgy
- Powder Metallurgy
Background:
- Aluminum-titanium (Al-Ti) alloys are critical for high-performance applications.
- Understanding phase evolution during consolidation is key to controlling alloy properties.
Purpose of the Study:
- To investigate the phase evolution and structural changes in Al-Ti powder mixtures after consolidation.
- To analyze the impact of annealing on the formation of equilibrium intermetallic phases.
Main Methods:
- Consolidation of Al-Ti powders using back pressure equal-channel angular pressing.
- In situ synchrotron high-energy X-ray diffraction (XRD) with continuous Rietveld analysis.
- Heating ramp from 300 K to 1075 K post-consolidation.
Main Results:
- Initial consolidation yielded Al-Ti intermetallic phases, excluding pure Al, with concentrations favoring alpha-Ti and TiAl(3).
- Annealing induced chemical segregation, promoting the formation of equilibrium phases: gamma-TiAl, alpha(2)-Ti(3)Al, and TiAl(2).
- An intermediate beta-Ti phase formed around 625 K due to delta-TiH(2) decomposition, influencing the final phase distribution.
Conclusions:
- Equal-channel angular pressing followed by annealing is effective for forming stable Al-Ti intermetallic compounds.
- The study provides detailed insights into the phase transformation mechanisms in Al-Ti systems.
- This research contributes to the development of advanced Al-Ti alloys with tailored microstructures.
