Plasticity improvement for dendrite/metallic glass matrix composites by pre-deformation. (5th December 2015)

• Record Type: Journal Article
• Authors: Sun, X.H.; Wang, Y.S.; Fan, J.; Yang, H.J.; Ma, S.G.; Wang, Z.H.; Qiao, J.W.
• Is Part Of: Materials & design. Volume 86(2016:Oct.)
• Page Start: 266
• Page End: 271
• Publication Date: 2015-12-05
• Subjects: Metallic glass -- Composite -- Improved plasticity -- Tensile pre-deformation -- Shear bands -- Young's modulus; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2015.07.109
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: The mechanical properties of in-situ metallic glass matrix composites (MGMCs) are investigated by tensile pre-deformation, followed by compression. The pre-deformation is utilized to exploit notable increases in plasticity, accompanied by slight increases in the compressive strength, and the deformation mechanisms are explored. The increased free volumes in the glass matrix after tensile pre-deformation contribute to the decrease of the Young's modulus of the glass matrix and lead to the increase in the stress concentration, promoting multiplication of shear bands. When the Young's modulus of the glass matrix matches that of the dendrites, the plasticity of in-situ dendrite-reinforced MGMCs is the optimized. Matching Young's modulus opens a door to design the MGMCs with excellent plasticity and remarkable work-hardening capability. Graphical abstract: Highlights: The pre-deformation can increase plasticity of the dendrite/metallic glass composites. The mathematical equations testify the improvement of plasticity for the first time. When dual-phase Young's modulus is equal, plasticity of composites is optimized. Matching Young's modulus opens a door to design toughened dual-phase composites.