Texture evolution during deformation of a Mo-Hf-C alloy studied with electron backscatter diffraction

The powder metallurgically produced alloy MHC (Mo-Hf-C) has excellent properties at elevated temperatures, e.g. high strength, and has a high recrystallization temperature. In order to study the recrystallization behavior of MHC, a detailed knowledge of the texture evolution during deformation is important. Therefore, samples were deformed with a deformation dilatometer at different temperatures, with different true strains and at a constant strain rate. Afterwards the microstructure was analyzed with scanning electron microscopy and electron backscatter diffraction. The investigations showed that the volume fraction of <111> directions, related to the loading direction, increases strongly and the fraction of <001> directions increases less strongly with increasing true strain below 1350 ℃. This happens at the cost of other textural components. Additionally, the results revealed that below 1350 ℃ the fraction of the <111> directions is independent of the deformation temperature for a deformation with a true strain of φ  = 0.92. This behavior changes for a deformation at temperatures above 1350 ℃. The volume fraction of other textural components in relation to the deformation direction increases at costs of the <111> directions. Furthermore, it was revealed that this behavior is mainly controlled by the Hf-content in solid solution.