Details of Grant 

EPSRC Reference:	GR/K08307/01
Title:	MECHANICAL PROPERTIES OF GAMMA-TIAL
Principal Investigator:	Taylor, Dr G
Other Investigators:	Sun, Professor YQ Hirsch, Sir P Sun, Dr Y
Researcher Co-Investigators:
Project Partners:
Department:	Materials
Organisation:	University of Oxford
Scheme:	Standard Research (Pre-FEC)
Starts:	01 October 1994	Ends:	31 March 1997	Value (£):	117,046
EPSRC Research Topic Classifications:	Materials Characterisation
EPSRC Industrial Sector Classifications:
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Summary on Grant Application Form
Alloys based on nearly equiatomic TiAl have considerable potential as high-temperature light-weight structural materials. At present the mechanical properties of the g - TiAl phase, the major constituent of such alloys, are not understood, and the data base is fragmentary and in part conflicting. The objective of the research programme is to provide such an understanding, through studies of the mechanical properties of singles of g - TiAl, as a function of composition and interstitial impurity content, coupled with electron microscopy and modelling. Single crystals of different Al content will be grown using the NEC image furnace facility provided on the SERC grant GR/H33978 for intermetallics. Yield stress and workhardening will be measured as a function of temperature and orientation, coupled with slip-line observations to determine the conditions under which ordinary and/or super dislocation slip systems operate. The nature of the dislocations and their distributions will be determined by TEM. Particular attention will be given to the strain-rate sensitivity and reversibility (with temperature) of the flow stress. These characteristics proved crucial in elucidating the mechanisms controlling the yield stress anomaly in Ni3 (AlX) alloys (SERC grant GR/J36785), and are expected to be equally important for g - TiAl. The results of this study should provide guidance for the development of TiAl based alloys, including the question of composition for optimum ductility.
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