Interface contributions to anelasticity in metallic glasses

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 442; no. 1; pp. 283 - 286
• Main Author: Aboki, Tiburce A.M.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 20-12-2006; Elsevier
• Subjects: Amorphous structure; Anelasticity, internal friction, stress relaxation, and mechanical resonances; Bulk metallic glass; Clusters; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Interfaces; Internal friction; Martensitic transformations; Materials science; Mechanical and acoustical properties of condensed matter; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Phase transformations; Physics; Interfaces; Clusters; Internal friction; Phase transformations; Amorphous structure; Bulk metallic glass; Crystallization; Martensitic transformations; Thermal cycle; Amorphous alloy; Heat treatments; Metallic glasses; Shape memory alloy; Anelasticity; Activation energy; Amorphous state structure; Strain rate; Zirconium alloys
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2006.05.168

Mechanical-spectroscopy thermal-cycling studies were conducted on a Zr
57Cu
20Al
10Ni
8Ti
5 (at.%) bulk amorphous alloy. Four internal friction peaks, namely P
1, P
2, P
3, and P
4, each accompanied with modulus softening, have been observed after a number of cycles. These peaks depend on the strain amplitude, heating rate and frequency. P
1 and P
2 shift in temperature with frequency, indicating contributions from thermally activated phenomena with the activation energy of about 1
eV. The four peaks have similar features to those that occur during crystallization of amorphous alloys and the martensitic transformation in shape memory alloys. These similarities provide strong evidence for interface motions in glassy structures.