Analysis of Acoustic Emission Characteristics in Aluminium Alloys

Abstract

The acoustic emission technique is an effective researching method to explain the deformation and fracture mechanisms of materials. To make clear the relationship between the strength and acoustic emission characteristics, as one of fundamental studies, acoustic emission behavior of some aluminium alloys in deformation process during tensile testing is observed. Obtained results are as follows: i) Two types of acoustic emission tendencies are observed in tested materials, namely, one of them showed an emission peak with the start of plastic deformation, and the others, during deformation flow. The former corresponds to work-hardening type alloy, and the latter, age-hardening type alloys. ii) Analizing the experimental data by a statistic method, acoustic emission pattern recognition of each alloy is attained. iii) The coefficients of the experimental formula connecting with acoustic emission number based on Gilman's dislocation theory are calculated.