Abstract
At first, velocities of longitudinal and transverse ultrasonic waves have been measured by a pulse echo overlap method at 3-5 MHz frequency under hydrostatic pressure in the 0--0,6 GPa range in single-crystals of Ti50Ni48Fe2 and Ti50Ni45Fe5 alloys, having and orientations in B2-phase state. The pressure dependences of C 11 , C'=(C 11 -C 12 )/2, C 44 elastic constants, adiabatic and isotermic compression moduli, Gruneisen microscopic parameters γ LA , γ TA1 , γ TA2 have been calculated on the basis of these data. It was found that unlike the temperature dependences the anomalous pressure dependence has the modulus - C' (dC'/dP 0, but decreases with increasing pressure in both of alloys. The data obtained indicates a rising inclination of B2-phase lattice of these alloys to Zener classical instability (instability relative to the shear of(110)[110]) with a pressure increase.
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