Acoustic Emission during Room Temperature Deformation of a γ-TiAl Based Alloy

Abstract

In this study an intermetallic γ-TiAl based alloy with either fine-grained equiaxed near-gamma or coarse-grained fully-lamellar microstructures was deformed in monotonic uniaxial compression experiments at room temperature. The deformation-induced acoustic emission was monitored by continuous acoustic emission recording using a root mean square voltmeter, and by acoustic emission waveform recording triggered by an external source at a constant frequency. Information concerning the deformation mechanisms and the onset of microcracking were obtained by correlating the acoustic emission results with those achieved by optical microscopy as well as scanning and transmission electron microscopy.