Cu-Be合金の引張変形に伴うアコースティック・エミッション

Abstract

Acoustic emission behaviors during the tensile test in a Cu-Be alloy was studied. Results obtained at various stages of age hardening were discussed.At the G.P. zone I stage, the acoustic emission rms voltage took a maximum at the yield point, and the rms peak voltage at the yield point was proportional to the yield stress. At the coexistent stage of G.P. zone I and G.P. zone II, the acoustic emission rms voltage took a maximum at a lower stress than the yield stress or had a small peak at a lower stress in addition to the main peak at the yield stress region. The results for both G.P. zone I stage and the coexistent stage of G.P. zone I and G.P. zone II could be explained reasonably by computer simulation of the acoustic emission during the yield process for a dispersion hardened alloy reported before. For the γ′ phase stage, the lower or non-existant acoustic emission was observed.