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The possibilities of microstructure refinement of several γ-TiAl alloys by the massive transformation and the effect of refinement on compression properties are discussed in this paper. Two alloys were prepared by plasma arc melting using the water-cooled copper crystallizer and two other alloys were prepared by vacuum induction melting. All alloys were subjected to subsequent two-step heat treatment, which consisted of the dissolving annealing followed by the ageing. This procedure resulted in the considerable reduction of the mean grain size from 200-340 µm to 70-35 µm. The microstructure refinement led to the increase of values of the plastic deformation in compression, namely from 917 % to 25-30 %. This effect denotes the substantial decrease of brittleness of these intermetallic alloys as a result of the used heat treatment.
Keywords: γ-TiAl alloys, plasma arc melting, vacuum induction melting, massive transformation, mechanical properties.© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.