Acoustic Emission Response of Ti6al4v Alloy in Different Heat Treatment Conditions During Tensile Testing

Acoustic Emission (AE) Technique is a unique Non Destructive Testing method being used as a global online monitoring tool for detection, location and characterization of various kinds of active defects. This paper illustrates the attempt to find the AE response of Ti6Al4V Alloy in different heat treatment conditions during tensile testing. Ti6Al4V alloy is tested in mill annealed, beta annealed, and solution treated & aged conditions using specifically designed specimens. The specimen were tested in a 10 T capacity universal testing machine. The test progress was monitored using strain gauges and AE sensors and the data was acquired through a Data Acquisition System (DAS). Various AE parameters were monitored and analysed in addition to the strain gage data. The pre-yielding phase, yielding phase, plastic deformation phase and the failure zone were identified and correlated with the strains. The present study attempts to demonstrate the prediction possibility of yielding of the alloy with respect to different microstructures well before the failure of the specimen, which in the turn can generate suitable acceptance criteria for the evaluation of the hardware in real time.