Martensitic Transformation and Plastic Deformation of TiCuNiZr-Based Bulk Metallic Glass Composites

Abstract

In this study, the microstructural evolution and mechanical properties of TiCuNiZr-based bulk metallic glass (BMGs) composites were systematically investigated in order to optimize both the strength and the ductility of BMGs. By tailoring the glass-forming compositions, TiCuNiZr-based BMG composites with different volume fractions of B2 (Ti,Zr)(Cu,Ni) crystals precipitating in the glassy matrix exhibit not only macroscopic ductility but also high strength as well as work-hardening, which is due to the formation of multiple shear bands and martensitic transformation during deformation. Optimized mechanical properties can be achieved when the crystalline volume fraction is at least higher than 44 vol. %, which is attributed to the sizeable difference between Young's moduli of the B2 (Ti,Zr)(Cu,Ni) crystals and the glassy matrix, and the precipitation of Ti 2 Cu intermetallic compounds at the B2 crystal boundaries. Our study provides a complementary understanding of how to tailor mechanical properties of TiCu-based BMG composites.

Impact of High Pressure on Reversible Structural Relaxation of Metallic Glass

“…[1] Inheriting significant characteristics from both metals and plastics, amorphous metals exhibit exceptional mechanical properties and performance, including high strength, resilience, corrosion resistance, and great flexibility but lightweight, with promising applications in military, engineering, and even and sport materials. [2][3][4][5][6] These properties strongly depend on structural relaxation process in metallic glasses. Therefore, to improve such properties, it is crucial to understand the glass transition and the underlying atomistic dynamics.…”

Simultaneously enhancing the strength and plasticity of Ti-based bulk metallic glass composites via microalloying with Ta

“…Therefore, researchers have shifted their focuses towards the development of the B2-type TRIP-reinforced Tibased BMGCs which are free of Be [6,7,10,16]. However, B2 particles formed during solidification are prone to coarse and thus distribute inhomogeneously, which inevitably deteriorate the TRIP effect [16,17]. Moreover, the involved deformation-induced martensitic transformation takes place swiftly and the rapid propagation of large martensite plates tends to initiate microcracks at the interface, thus diminishes the TRIP reinforcement in the Ti-based BMGCs.…”

Impact of high pressure on reversible structural relaxation of metallic glass

“…To obtain amorphous structures, metallic glasses are cooled down very rapidly upon heating to avoid crystallization [1]. Inheriting significant characteristics from both metals and plastics, amorphous metals exhibit exceptional mechanical properties and performance, including high strength, resilience, corrosion resistance and great flexibility but light weight, with promising applications in military, engineering and even and sport materials [2][3][4][5][6]. These properties strongly depend on structural relaxation process in metallic glasses.…”