In situ synchrotron high-energy X-ray diffraction analysis on phase transformations in Ti-Al alloys processed by equal-channel angular pressing
Klaus-Dieter Liss, Ross E Whitfield, Wei Xu, Thomas Buslaps, LaReine A Yeoh, Xiaolin Wu, Deliang Zhang, Kenong Xia
JOURNAL OF SYNCHROTRON RADIATION | INT UNION CRYSTALLOGRAPHY | Published : 2009
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 (alpha-Ti, TiAl(3)). Upon annealing, the phase evolution and lattice parameter changes owing to chemical segregation, which is in favour for the more equilibrated phases such..View full abstract
The Australian writers acknowledge financial support from the Access to Major Research Facilities Programme which is a component of the International Science Linkages Programme established under the Australian Government's innovation statement, Backing Australia's Ability. WX, XW and KX acknowledge the support by the Australian Research Council with the ARC Centre of Excellence for Design in Light Metals.