Аннотация:The method of bending self-excited vibrations of a thin rod at sound wave frequency was applied to obtain temperature dependences of Young modulus E and internal friction Q-1 within the range of 80-380 K for polycrystalline YFe11Ti. Experimental results are analyzed on the basis of Debye’s model of solids (for Young modulus) and relaxation model of inelastic behaviour of solids (for internal friction).