To understand deeply the structural, elastic and thermodynamic characteristics of AI2X （X= Sc, Y） compounds in C15 type （space number 227） Cu2Mg structure, we have performed ab-initio density functional theory within the local density approximation （LDA） and the generalized gradient approximation （GGA）. The thermodynamic properties of the considered structures are obtained through the quasi-harmonic Debye model. We have presented the results on the basic physical parameters, such as the lattice constant, bulk modu- lus, pressure derivative of bulk modulus, second-order elastic constants, Zener anisotropy factor, Poissongs ratio, Youngts modulus, and isotropic shear modulus. In order to gain further information, the pressure- and temperature-dependent behaviour of the volume, bulk modulus, thermal expansion coefficient, heat capacity, entropy, Debye temperature and Griineisen parameter were also evaluated over a pressure range of 0-20 GPa for Al2Sc and 0-17 GPa for Al2Y compound and a wide temperature range of 0-2000 K for both compounds. The obtained results were compared with the other reported values.
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