ZUSAMMENHANG ZWISCHEN AUSHAERTUNGSZUSTAND UND SCHALLEMISSION BEI ZUEGIGER BEANSPRUCHUNG DER LEGIERUNG AlCu4,3.

The purpose of the investigation described was to clarify the contribution of dislocation movement to sonic emission during the deformation of metals. The dependence of the sonic emission on the structural state was explained in terms of the degree of precipitation and the precipitation density which determine the dislocation paths and which are themselves determined from hardness measurements, mechanical characteristics obtained from tensile tests, and scanning electron micrographs. The results obtained confirm the validity of existing theories on the dependence of the sonic emission intensity on the dislocation path or on the surface traversed by the dislocations for AlCu4. 3 alloy. In close connection with this it is shown that ″structural inhomogeneities″ such as, in this case, precipitate-free fringes, have a decisive influence on the sonic emission behavior so that in this particular case the dislocation paths also play a decisive role.