A New Experimental Method to Develop the Nonlinear Anelastic Internal Friction Peaks Appearing around Room Temperature

A New experimental procedure to definitely develop the nonlinear anelastic internal friction peaks (P₁′ and P₁″ peaks) appearing around room temperature, called “medium cold work method”, is suggested. This method consists in stretching and then twisting the thoroughly annealed specimen at room temperature by a medium amount. The experimental results indicate that the tensile deformation plays a decisive role and no peaks appear in the case of pure twisting deformation. The temperature internal friction peaks in Al–Mg alloys are studied with this method.