Ti-22Al-25Nb orthorhombic alloy is considered to be an advanced intermetallic alloy for high-temperature applications. In this paper, the effects of Hot Isostatic Pressure (HIP), homogenizing annealing and aging in different phase regions on microstructure and microhardness of the Ti-22Al-25Nb alloy obtained from elemental powders by Selective Laser Melting (SLM) were studied. HIP allowed to reduce the residual porosity in the samples, however high-temperature annealing was needed to dissolve Nb particles and obtain a homogeneous microstructure. Differential Scanning Calorimetry was used to determine phase transition temperatures in the fabricated alloy and allowed to choose appropriate aging temperatures. Aging of the alloy resulted in the formation of intermetallic Ti2AlNb and Ti3Al phase depending on the temperature.Keywords: Additive manufacturing, Ti-22Al-25Nb, heat treatment, microstructure, intermetallic
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