TY - GEN A1 - Bolz, Sebastian A1 - Oehring, Michael A1 - Lindemann, Janny A1 - Pyczak, Florian A1 - Paul, Jonathan A1 - Stark, Andreas A1 - Lippmann, Thomas A1 - Roth-Fagaraseanu, Dan A1 - Schreyer, Andreas A1 - Weiß, Sabine A1 - Schrüfer, Susanne T1 - Microstructure and mechanical properties of a forged beta-solidifying gamma TiAl alloy in different heat treatment conditions T2 - Intermetallics Y1 - 2015 VL - 2015 IS - 58 SP - 71 EP - 83 ER - TY - GEN A1 - Oehring, Michael A1 - Lindemann, Janny A1 - Pyczak, Florian A1 - Paul, Jonathan A1 - Stark, Andreas A1 - Lippmann, Thomas A1 - Schrüfer, Susanne A1 - Roth-Fagaraseanu, Dan A1 - Schreyer, Andreas A1 - Weiß, Sabine T1 - Microstructure and mechanical properties of a forged β-solidifying γ TiAl alloy in different heat treatment conditions T2 - Intermetallics N2 - In the cast condition g titanium aluminide alloys that solidify completely through the b phase are characterized by fine and homogeneous microstructures, weak textures and low segregation. For these reasons such alloys have a relatively good workability and can be closed-die forged without preceding ingot breakdown even if the alloys contain no large fractions of the b phase at the working temperature. The present work was devoted to a combined study of the constitution and microstructural morphologies that develop in various two-step heat treatments of a single-step forged b solidifying alloy. The study included high-energy X-ray diffraction for in situ investigations of the constitution at the heat treatment temperature. It was observed that the phase ransformations are quite sluggish in the material which results in fine microstructures and some conditions that significantly deviate from thermodynamic equilibrium. Further, tensile and creep testing was carried out on the different material conditions in order to identify the range in which the properties can be varied. It is found that this easily forgeable material exhibits comparable strength, ductility and creep strength as more conventional peritectically solidifying alloys. KW - TiAl KW - Titanium Aluminides KW - hot die forging KW - TNB-V4 Y1 - 2015 UR - http://www.sciencedirect.com/science/article/pii/S096697951400301X U6 - https://doi.org/10.1016/j.intermet.2014.11.008 SN - 0966-9795 VL - 2015 IS - 58 SP - 71 EP - 83 ER -