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Texture evolution and Swift effect in NiAl

NiAl is an intermetallic compound with a high melting point (about 1660°C), good corrosion resistance, and good electrical and thermal conductivity at a low density compared to conventional high temperature alloys, but suffers from brittleness below 500°C. In order to overcome this brittleness, a fine grained microstructure is desirable, which can be achieved by extensive deformation [5]. This leads to a strong texture evolution. Therefore it is impotrant to understand the texture evolution in NiAl. An elastic viscoplastic polycrystal model based on the Taylor assumption is implemented into the commercial finite element software ABAQUS. Three different simulation techniques have been used, namely a deformation driven process for a material point, an FE model of the torsion test, and a simple shear deformation of an RVE. The RVE consists of 15625 elements, the microstructure is modeled with 350 periodic Voronoi cells. Periodic boundary conditions have been applied. The RVE simulations have been performed in order to estimate the applicability of the Taylor model.