Mechanism of mechanical relaxation associated with precipitates

• Published in: Journal of physics. Condensed matter Vol. 1; no. 50; pp. 10039 - 10045
• Main Authors: Wang, Yening, Gu, Min, Sun, Linhai
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 18.12.1989; Institute of Physics
• Subjects: Anelasticity, internal friction, stress relaxation, and mechanical resonances; Applied sciences; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Mechanical and acoustical properties of condensed matter; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals, semimetals and alloys; Metals. Metallurgy; Other mechanical properties; Physics; Specific materials; Precipitation; Internal friction; Transition metal Alloys; Theoretical study; Atomic cluster; Mechanical stress relief; Precipitate; Binary alloy
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/0953-8984/1/50/006

The thermal activated relaxation connected with precipitates in a number of alloys always exhibits a broad and asymmetric peak in T exp --1 plots, which is very different from the Debye-type relaxation peak. Because solute clustering is present around the precipitates, a strong correlation should exist between the motions of solute. Ngai's correlated-state model is used to simulate the relaxation spectrum. The calculation not only correlates quite well with the experimental data on the Al--Ag, Ti--H and Ta--H systems but also has profound implications on the mechanism of the internal friction peak. Graphs. 15 ref.--AA(UK).