%0 Artikel %@ 0921-5093 %A Appel, F. %A Oehring, M. %A Paul, J.D.H. %D 2008 %J Materials Science and Engineering A %N 1297 %P 232 - 236 %R doi:10.1016/j.msea.2007.08.095 %T A novel in situ composite structure in TiAl alloys %U http://dx.doi.org/10.1016/j.msea.2007.08.095 1-2 %X Phase decomposition and ordering reactions in /B2-phase containing TiAl alloys were utilized to establish a novel, previously unreported, type of in situ composite. The characteristic constituents of this composite are laths with a modulated substructure that are comprised of several stable and metastable phases. The modulation occurs at the nanometer-scale and thus leads to a significant refinement of the material. Microstructural control by conventional thermomechanical processing results in a structurally and chemically very homogeneous material with appreciable mechanical properties. The physical metallurgy of this novel type of alloy has been assessed by high-resolution transmission electron microscopy and mechanical testing.