Abstract
Abstract A STUDY OF RECRYSTALLIZATION OF HIGH PURITY SILVER BY MEASUREMENTS OF INTERNAL FRICTION AND ELASTIC MODULUS The recrystallization of cold-worked silver (99-95 to 99-998% purity) has been studied by internal friction (Q−1) and elastic modulus defect (δE/E) measurements after isothermal and isochronal annealings between 20° and 400°C. The internal friction and modulus defect measurements were made at room temperature. It is shown that both properties are strongly influenced by the recrystallization process, internal friction being characterized by a maximum and the modulus defect by a drop. With the help of microscopy observations and microhardness measurements it is deduced that the increase of Qm −1 (measured internal friction) is a consequence of the appearance of recrystallized grains. The subsequent drop of Qm −1 is caused by an evolution of a dislocation network in the new grains. These results are explained by the Granato and Lucke theory of dislocations. A simple model allows us to compute ...
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