Plastic flows of in-situ metallic glass matrix composites upon dynamic loading

• Published in: Materials letters 2014-03, Vol.119, p.92-95
• Main Authors: Qiao, J.W., Chu, M.Y., Cheng, L., Ye, H.Y., Yang, H.J., Ma, S.G., Wang, Z.H.
• Format: Article
• Language: English
• Subjects: Amorphous materials; Deformation and fracture; Metallic composites
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2013.12.110

In-situ dendrite/metallic glass matrix composites with a composition of Ti62Zr12V13Cu4Be9 upon dynamic loading exhibit distinguishing plasticity. It is found that a positive strain-rate sensitivity of the flow stresses with the strain rates dominates in such in-situ dendrite-reinforced composites. The Johnson–Cook (J–C) plasticity model is employed to model the flow behavior, and the constitutive relationship is obtained as σ=(1350+54ε−0.03)(1+0.003lnε.⁎). The ductile dendrites accommodate plasticity, characterized by the multiplication of dislocations and lattice distortions, together with the appearance of Moiré patterns. [Display omitted] •It is found that a positive strain-rate sensitivity of the flow stresses with the strain rates dominates in such in-situ dendrite-reinforced composites.•The Johnson–Cook (J–C) plasticity model is employed to model the flow behavior.•The ductile dendrites accommodate plasticity, characterized by the multiplication of dislocations and lattice distortions, together with the appearance of Moiré patterns.