MICROPLASTICITY AND INTERNAL FRICTION IN PURE IRON

Amplitude-Dependent Internal Friction and Microplasticity in Thin-Film Materials

Internal friction in aluminum thin films on silicon substrates has been measured uaween 180 and 360 K as a function of strain amplitude. The amplitude dependence of internal fnction in the aluminum films has been evaluated from the data on the film-substrate composite and further converted into the plastic strain of the order of as a function of the effective stress on dislocation motion. The m...

Internal Friction Characteristics of Interstitial Carbon and Nitrogen in -iron

Internal Friction Peak in Cold-Worked ”Pure” Aluminum and Aluminum Alloys

Low frequency internal friction measurements have been made on "pure" aluminum and dilute aluminum alloys in heavily cold-worked states. A relaxation peak is observed at about 200 K(for 1Hz) even in specimens of nominally 4N or higher purity. This peak is considered to be the same as those previously reported by several researchers for dilute aluminum alloys of Cu, Mg or Ga. Among various eleme...

Internal friction in enzyme reactions.

The empirical concept of internal friction was introduced 20 years ago. This review summarizes the results of experimental and theoretical studies that help to uncover the nature of internal friction. After the history of the concept, we describe the experimental challenges in measuring and interpreting internal friction based on the viscosity dependence of enzyme reactions. We also present spe...

Internal Friction in Concentrated Alloys

Internal friction in concentrated alloys at kHz frequencies and at temperatures from 120 3 0 0 K has been studied in alpha-and beta-brasses as a function of grain size, temperature and pre-strain, and a statistical model has been proposed to account for the observations.