Mechanical property of a new Zr-based bulk metallic glass with certain plasticity at low temperature

In order to define the relation between yield behavior and yield criterion of bulk metallic glass (BMG), analysis and investigations have been carried out for interrelations between yield strengths and the angle which fracture plane deviates from the 45° plane of the maximum shear stress in tensile and compressive test of BMG. Tensile fracture angle is consistent with the result calculated by theory of disconnected slip line field and Mises yield condition. Compressive fracture angle isconsistent with the result calculated by Coulomb yield condition. Conclusion: BMG obeys different yield criterions in different stress states. For tensile, it follows Mises criterion, and for compression, it follows Coulomb criterion.