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Characterization of Thermomechanical Behavior of Ti3SiC2 and Ti2AlC Ceramics Elaborated by Spark Plasma Sintering Using Ultrasonic Means  

In order to better understand the thermomechanical behaviors of Ti3SiC2 and Ti2AlC ceramics, sintered by spark plasma sintering process (SPS), ultrasonic pulse echography in “long bar mode” (US) and acoustic emission (AE) techniques are applied. High‐temperature investigations of the evolution of Young's modulus (E) and AE activity are carried out up to 1 473 and 1 623 K. Results show a decrease of E with increasing temperature which is more marked around maximal temperature of the thermal cycle for Ti2AlC material. Moreover, the increase of the maximal temperature of the thermal cycle influences the number of recorded cumulated hits. Both measurements (US + AE) highlight the role of the plastic deformation mechanism (motion of dislocation) activated over the brittle‐to‐plastic transition temperature.