High entropy Ti20Zr20Cu20Ni20Be20 bulk metallic glass

• Published in: Journal of non-crystalline solids Vol. 364; pp. 9 - 12
• Main Authors: Ding, H.Y., Yao, K.F.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier B.V 15.03.2013; Elsevier
• Subjects: Bulk metallic glass; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Glass forming ability; Glass transitions; Glasses (including metallic glasses); High entropy alloy; Materials science; Mechanical property; Physics; Specific materials; Specific phase transitions; Thermal properties of condensed matter; Thermal properties of crystalline solids; Thermodynamic properties; Ti20Zr20Cu20Ni20Be20 alloy; High entropy alloy; Ti20Zr20Cu20Ni20Be20 alloy; Mechanical property; Bulk metallic glass; Glass forming ability; high entropy alloy; Annealing; alloy; Be; Phase transformations; Mechanical properties; Entropy; Glass transition; Casting; Metallic glasses; CU; Ti; Zr; Ni; Copper; Thermodynamic properties; Rupture strength
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2013.01.022

In this letter, we report that a new bulk metallic glass (BMG) of Ti20Zr20Cu20Ni20Be20, with a critical diameter of 3mm, has been successfully fabricated using copper mold casting method. Different from most reported BMGs which possess one or two main constituents, this newly developed BMG possesses five elements with equal atomic concentration, which has been defined as high entropy alloy. This high entropy bulk metallic glass (HE-BMG) exhibits high fracture strength of 2315MPa but a brittle behavior. The glass forming ability, mechanical property and phase transformation after annealing of the HE-BMG are discussed in detail. And a way for designing high entropy bulk glassy alloy has been proposed. ► High entropy Ti20Zr20Cu20Ni20Be20 bulk metallic glass (HE-BMG) was prepared. ► Fracture strength of the Φ3mm glassy sample is 2315MPa. ► This is the fifth article about HE-BMG. ► It improves our understanding for high entropy alloys and bulk metallic glasses.