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TiAl-based semi-finished material produced by reaction annealing of Ti/Al layered composite sheets

Pukenas, A.; Chekhonin, P.; Scharnweber, J.; Chulist, R.; Oertel, C.-G.; Freudenberger, J.; Skrotzki, W.

In this study multi-layered Ti/Al sheets prepared by accumulative roll bonding (ARB) underwent a two-step heat
treatment (HT) to form intermetallic compounds. The microstructure and crystal structure of the samples were
examined by scanning and transmission electron microscopy as well as energy-dispersive X-ray spectroscopy and synchrotron diffraction. In the first solid-state reaction annealing step, Ti-rich ARB samples containing 60 at% Ti and 40 at% Al were held at 600°C for 12 h under a uniaxial pressure between 0 MPa and 50 MPa applied along
the normal direction of the sheets. At this stage, Al is completely consumed by forming mainly Al-rich intermetallic
phases and to a lower extent other titanium aluminides such as Ti3Al and TiAl. In the second step, hightemperature annealing produces TiAl and Ti3Al as major phases during both pressureless annealing at 1100°C, 1200°C and 1300°C and annealing under an uniaxial pressure of about 100 MPa at 1200°C. Pore formation during the reaction annealing can be significantly reduced by the applied pressure. As a result, a TiAl-based semifinished material was fabricated.

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  • Secondary publication expected from 15.12.2022

Permalink: https://www.hzdr.de/publications/Publ-33901
Publ.-Id: 33901