Hydrogen-induced phase transformations in Sm-Co alloy under the action of ultrasound

By the method of X-ray phase diffraction analysis, we study specific features of the action of ultrasound with a frequency of 44 kHz on the interaction of an alloy based on SmCo5 (SmCo3 is an impurity) with hydrogen at pressures of 200–500 kPa and temperatures lower than 1223°K under the conditions of hydrogenation and disproportionation. It is shown that at 473 and 773°K, the impurity phase transforms into unidentified products. At 913°K, the alloy partially disproportionates into SmHx and Co. The degree of disproportionation increases as a result of holding at 913°K. Above 1173°K, we identify SmCo5, SmHx, and Sm2Co17. The ultrasonic treatment accelerates the hydrogen-induced phase transformations.