The pronounced changes in the state of magnetization of ultrasonically, irradiated SAE 1019 steel are utilized to determine acoustic stresses, modes of propagation of 20‐kc/sec ultrasonic‐stress waves, and variations in these parameters as functions of acoustic energy density (⩽109 erg/cm3) superimposed static tensile stress (⩽1010 dyn/cm2), and temperature (⩽Curie point). The quantitative results from these studies are fundamental for research on the mechanisms of plastic deformation, zone melting, and fracturing of metal crystals by high‐amplitude ultrasonic stress waves. The results also reveal potentials of inverse magnetostriction in investigations on magnetization, and relations between magnetostriction and Young's modulus, phase transition, and phenomena associated with the internal structure of the materials.

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