Effect of the cooling rate on plastic deformability of a Zr-based bulk metallic glass

Abstract

The present work found the plastic deformability of Zr 65 Cu 17.5 Ni 10 Al 7.5 BMG dependent on the cooling rate during the formation from the molten state alloy. The deformation behavior in the compression test of φ 2 mm Zr 65 Cu 17.5 Ni 10 Al 7.5 BMGs as-cast or lathed from different sizes as-cast samples was characterized, and they exhibited different plastic strains. The compressive plastic strain increases with the decreasing diameter of the as-cast specimens, i.e. with increasing the cooling rate. It is suggested that free volume content in the BMGs, which is related to the cooling rate during the rapid solidification, could play an important role in the deformation process of the BMGs. cooling rate, shear band, serration, bulk metallic glass

Cooling rate effect on Young's modulus and hardness of a Zr-based metallic glass

“…The increase of the cooling rate may result in configurationally looser atomic packing and thus, more free-volume zones [14,15], which therefore contributes to larger plasticity [16][17][18]. However, the cooling-rate effect on the yield strength of MGs is yet to be conclusive [16,19,20]; meanwhile, the studies concerning the cooling rate effect on the elastic behavior of MGs are limited. In view of these, further research effort is thus necessary for clarifying the aforementioned cooling rate effect.…”

Ab initiocalculations of thermomechanical properties and electronic structure of vitreloyZr41.2Ti13.8CHunca1, Dharmawardhana2, Sakidja3 et al. 2016Phys. Rev. B160130View full textAdd to dashboardCite

“…This underestimation can be understood from the fact that our simulated glass has a slighly lower weight density or a relatively larger molar volume. It has been shown from experimental works in Zr-based BMG's [76][77][78] that the Zr-based BMG with a larger molar volume, normally procured from a faster quenching rate from the melt, would result in relatively lower elastic properties. Nevertheless, this is well within the expected range for calculations using a stress-strain approach.…”

Correlation between supercooled liquid region and crystallization behavior with alloy composition of La-Al-Cu metallic glasses

“…In the last two decades, a large number of bulk metallic glasses (BMGs) have been developed in various alloy systems, which are attractive new materials because of their outstanding mechanical, physical and chemical properties [1][2][3][4][5][6][7][8][9]. Extensive studies on the structure, glass-forming ability, crystallization behavior and properties of BMGs have been conducted [1][2][3][4][5][6][7][8][9].…”

“…Extensive studies on the structure, glass-forming ability, crystallization behavior and properties of BMGs have been conducted [1][2][3][4][5][6][7][8][9]. It is also notable that many BMGs exhibit large supercooled liquid region ΔT x (=T x −T g , T x and T g are the onset temperature of crystallization and glass transition temperature, respectively.)…”