In Situ Synchrotron Study of B19 Phase Formation in an Intermetallic γ-TiAl Alloy


  • The support of DESY management, User Office, and HZG beamline staff is highly acknowledged. Research activities leading to the presented HEXRD results received funding from the European Community's Seventh Framework Programme (FP7/2007–2013) under grant agreement no. 226716. A part of this project was conducted within the framework of the BMBF project O3X3530A, Germany. Many thanks go to the Styrian Materials Cluster, Austria.


A multitude of phases exists in the binary Ti–Al phase diagram and even greater numbers are formed in structural TiAl alloys, which contain additional alloying elements to improve their properties. In the current study, a Ti–45 Al–3 Mo–0.1 B (in at%) alloy was investigated with respect to the phases occurring in chemical non-equilibrium. In situ high-energy X-ray diffraction experiments enabled to identify a transient phase to be of the B19 type and to determine its temperatures of formation and dissolution.