Structural and thermal sensitivity of Cu–Zr–Ti amorphous alloys to pressure

• Published in: Journal of non-crystalline solids Vol. 379; pp. 1 - 6
• Main Authors: Cai, A.H., Xiong, X., Liu, Y., An, W.K., Zhou, G.J., Luo, Y., Li, T.L., Li, X.S.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier B.V 01-11-2013; Elsevier
• Subjects: Amorphous alloys; AMORPHOUS STRUCTURE; CASTING; Compressing; Condensed matter: structure, mechanical and thermal properties; Copper; COPPER ALLOYS (40 TO 99.3 CU); Copper base alloys; Cross-disciplinary physics: materials science; rheology; Crystallization; Cu-based amorphous alloy; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Glass transition; Glass transitions; Growth from solid phases (including multiphase diffusion and recrystallization); Materials science; Metallic glasses; Methods of crystal growth; physics of crystal growth; Physics; Pressure; Pressure casting; Sensitivity; Solid-solid transitions; Specific phase transitions; Thermal properties of condensed matter; Thermal properties of crystalline solids; Thermodynamic properties; ZIRCONIUM COPPERS; Cu-based amorphous alloy; Pressure; Sensitivity; Glass transition; Casting; Pressure effects; Enthalpy; Crystallization; Free volume; Thermodynamic properties; Activation energy
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2013.07.023

The structural and thermal sensitivity of Cu(60−x)Zr(30+x)Ti10 (x=0, 5, and 10 at%) amorphous alloys to pressure was investigated. The structural sensitivity to pressure decreases with increasing Cu content, resulting in the decrease of the deforming and casting capacities. The increase of the crystallization enthalpy is positively related with the increase of the free volume. The activation energies for the glass transition (Eg) and the crystallization (Ex) increase with increasing Cu content for the as-cast and compressed amorphous alloys, but decrease after the compression. The more the Cu content or the increment of the free volume is, the more the decrement of the Eg. Thus the increase of the free volume significantly influences the glass transition and the crystallization. Moreover, the effect of the pressure on the glass transition depends stronger on the change of the free volume than on the magnitude of the free volume.
•The structural sensitivity to the compression decreases with increasing Cu content.•The activation energies increase with increasing Cu content.•The activation energies decrease after the compression.•The decrement of the Eg increases with the increment of the free volume.•The decrement of the Eg decreases with increasing Cu content after the compression.