Effects of rapid heating cyclic heat treatment on microstructures and
compression mechanical properties of TiAl-based alloy①
compression mechanical properties of TiAl-based alloy①
(1. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;
2. Materials Science and Engineering Department, University of Tennessee,
Knoxville, TN 37996-2200, USA)
2. Materials Science and Engineering Department, University of Tennessee,
Knoxville, TN 37996-2200, USA)
Abstract: By means of rapid heating cyclic heat treatment, the microstructure of a TiAl-based alloy was refined. The colony size and lamellar spacing were measured to be 50μm and 0.12μm, respectively. The compression mechanical properties were determined at room temperature and the best comprehensive mechanical properties can reachσ0.2of 745.1 MPa,σpof 1 672.2 MPa andδof 19.40%. The improvement of mechanical properties is caused by the microstructural
refinement and the phase interface nucleation contributes a lot to the refinement of microstructure.
refinement and the phase interface nucleation contributes a lot to the refinement of microstructure.
Key words: TiAl; compression mechanical properties; microstructural refinement; phase interface nucleation