A GENERAL DISLOCATION DYNAMIC MODEL OF INTERNAL FRICTION IN THE PROCESS OF PLASTIC DEFORMATION IN METALS

Abstract
Starting with the general relationship between dislocation velocity V and resolved shear stress τ, V = f (τ), an expression relating the internal friction in the process of plastic deformation Q^1-_p with dislocation dynamic function f (τ), plastic deformation rate [MATH]p, angular frequency of internal friction measurements [MATH] and Young's Modulus E (or shear Modulus G) was obtained as Q^-1₉ = [MATH] ( for torsional vibration in f.c.c. metals). By utilizing this expression and the experimental data of Q^-1_p for high-purity Al, an explicit functional relationship of f (τ)^P was derived as V = V* exp {-τ* / (τ-τ_o)} for polycrystalline Al. The parameters τ* and τ_o were obtained.