It is well known that TiAl alloys are embrittled on room temperature tensile testing after being exposed to elevated temperatures, however the reason behind the phenomena is little understood. This contribution will present new results from an investigation that has been performed on exposed tensile test samples that were tested under liquid nitrogen. The findings present a new light on the embrittlement phenomena and will be discussed in relation to the various TiAl embrittlement theories that have been presented in the literature.