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In situ synchrotron high-energy X-ray diffraction analysis on phase transformations in Ti-Al alloys processed by equal-channel angular pressing

Journal Article


Abstract


  • Mixtures of 47-Al and 53-Ti powders (atomic %) have been consolidated using back pressure equal-channel angular pressing starting with both raw and ball-milled powders. In situ synchrotron high-energy X-ray diffraction studies are presented with continuous Rietveld analysis obtained upon a heating ramp from 300 K to 1075 K performed after the consolidation process. Initial phase distributions contain all intermetallic compounds of this system except Al, with distribution maxima in the outer regions of the concentrations (α-Ti, TiAl3). Upon annealing, the phase evolution and lattice parameter changes owing to chemical segregation, which is in favour for the more equilibrated phases such as γ-TiAl, α2-Ti3Al and TiAl2, were followed unprecedentedly in detail. An initial δ-TiH2 content with a phase transition at about 625 K upon heating created an intermediate Β-Ti phase which played an important role in the reaction chain and gradually transformed into the final products. © 2009 International Union of Crystallography.

Publication Date


  • 2009

Citation


  • Liss, K. D., Whitfield, R. E., Xu, W., Buslaps, T., Yeoh, L. A., Wu, X., . . . Xia, K. (2009). In situ synchrotron high-energy X-ray diffraction analysis on phase transformations in Ti-Al alloys processed by equal-channel angular pressing. Journal of Synchrotron Radiation, 16(6), 825-834. doi:10.1107/S090904950903711X

Scopus Eid


  • 2-s2.0-70350320397

Start Page


  • 825

End Page


  • 834

Volume


  • 16

Issue


  • 6

Abstract


  • Mixtures of 47-Al and 53-Ti powders (atomic %) have been consolidated using back pressure equal-channel angular pressing starting with both raw and ball-milled powders. In situ synchrotron high-energy X-ray diffraction studies are presented with continuous Rietveld analysis obtained upon a heating ramp from 300 K to 1075 K performed after the consolidation process. Initial phase distributions contain all intermetallic compounds of this system except Al, with distribution maxima in the outer regions of the concentrations (α-Ti, TiAl3). Upon annealing, the phase evolution and lattice parameter changes owing to chemical segregation, which is in favour for the more equilibrated phases such as γ-TiAl, α2-Ti3Al and TiAl2, were followed unprecedentedly in detail. An initial δ-TiH2 content with a phase transition at about 625 K upon heating created an intermediate Β-Ti phase which played an important role in the reaction chain and gradually transformed into the final products. © 2009 International Union of Crystallography.

Publication Date


  • 2009

Citation


  • Liss, K. D., Whitfield, R. E., Xu, W., Buslaps, T., Yeoh, L. A., Wu, X., . . . Xia, K. (2009). In situ synchrotron high-energy X-ray diffraction analysis on phase transformations in Ti-Al alloys processed by equal-channel angular pressing. Journal of Synchrotron Radiation, 16(6), 825-834. doi:10.1107/S090904950903711X

Scopus Eid


  • 2-s2.0-70350320397

Start Page


  • 825

End Page


  • 834

Volume


  • 16

Issue


  • 6