High Strain Rate Deformation Behavior of Materials: Effect of Crystal Structure, Grain Size, Microstructure and Texture

Various materials are being subjected to high strain rate loading conditions when in use such as penetrator or armour. Armco Fe, Pure Mg, Ultra high strength martensitic steels are some of the widely used material. However, limited study exists on understanding effect of crystal structure, strain rate and temperature dependent deformation behavior of these materials. In the current study, we explore the strain rate and crystal structure dependent change in deformation mechanism of these materials. Pure Mg and Fe were subjected to compression at a strain rate of 0.01- 4000/s. The effect of strain rate, initial microstructure and texture on twin induced grain re-orientation, slip and twin-slip interaction is studied. An approach to derive a physics based model to depict microstructure based phenomenon is discussed. The effect of strain rate on flow behaviour and fracture in Ultra High Strength martensitic steels along with adiabatic shear band formation is also explored.