STRUCTURAL STABILITY OF QUENCHED TI-NB-AL ALLOYS ON HEATING

Temperature dependences of Young's modulus E, shear modulus G, logarit hmic decrement Q(-1), and thermal effects of the quenched Ti - Nb - Al alloys (2 wt % Al and 15 - 40 wt % Nb) with various as-quenched struc tures (alpha' (alpha''), alpha'' + beta(met), beta(met)) are studied. On heating, the metastable structure decomposes towards the equilibriu m state, and, in the temperature range of phase transformations, the i nternal friction increases. The results could be used for the attainme nt of optimal properties (E, G, and Q(-1)) after an adequate heat trea tment.