Acoustic emission during room temperature deformation of a gamma-TiAl based alloy

In this study an intermetallic gamma-TiAl based alloy with either fine-grai ned equiaxed near-gamma or coarse-grained fully-lamellar microstructures wa s deformed in monotonic uniaxial compression experiments at room temperatur e. The deformation-induced acoustic emission was monitored by continuous ac oustic emission recording using a root mean square voltmeter, and by acoust ic emission waveform recording triggered by an external source at a constan t frequency. Information concerning the deformation mechanisms and the onse t of microcracking were obtained by correlating the acoustic emission resul ts with those achieved by optical microscopy as well as scanning and transm ission electron microscopy.