Аннотация:Thorough investigation of Young modulus (E) and internal friction (Q-1) temperature dependences of polycrystalline TbFe11Ti alloy was carried out by the method of lateral bending self-sustained oscillations at the frequency of ≈1.5 kHz within the temperature range of 100-430 K. At 240 and 375-380 K anomalous behaviour of E(T) and Q-1(T) curves was revealed. Extremely high temperature hysteresis of the curves obtained testifies to the fact that there is a wide range of metastable states accompanying the rearrangement of magnetic structure in TbFe11Ti compound.