On-Line Ultrasonic Characterization of Bulk and Nano Perovskites and Maraging Steel

This thesis deals with the synthesis and characterisation of bulk and nano perovskite manganites materials and evaluation of microstructural changes of M250 grade maraging steel during aging. It also deals with the design and fabrication of an indigenous experimental set-up used for on-line ultrasonic velocities/attenuations measurements over wide range of temperatures from room temperature (300 K) to 1200 K.