Elastoplastic deformation of single crystal based on Ni₃Al intermetallide depending on crystallographic direction

The paper presents the results of a numerical study in a three-dimensional formulation of the processes of elastoplastic deformation of a cubic single crystal based on the Ni₃ Al intermetallic (VZHM8) under impact loading. Impact loading was carried out in the [001] direction. The development of deformation processes was studied either in the directions [100] and [010], or [011] and . In the first case, the crystallographic directions of the single crystal coincide with the axes of the calculated coordinate system and the elastic constants in these directions are the same. In the second case, only one axis coincides with the crystallographic direction [100], the other two are rotated by an angle of 45 °; it was shown that a change in the elastic constants of a single crystal in new directions entails a change in the volume compressibility in all three directions. This is a consequence of the generalized Hooke's law. In the mathematical model used in this work to describe elastoplastic deformation, it is assumed that the volume compressibility of the single crystal is constant in the region of elastic and plastic deformations. It is shown for the first time that with the above rotation of the coordinate axes in a cubic single crystal, a change in elastoplastic deformations in the direction of the axis of impact loading is detected.

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