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Solid solution MAX phases offer the opportunity for further tuning of the thermomechanical and functional properties of MAX phases, increasing their envelope of performance. Previous experimental results show that the lattice parameters of decrease, while the Young's modulus increases with increased Si content in the lattice. In this work, we present a computational investigation of the structural, electronic, and mechanical properties of , 0.25, 0.5, 0.75, and 1). The solid solutions were modeled using special quasirandom structures (SQS) and calculated using density functional theory (DFT), which is implemented in the Vienna ab initio simulation package (VASP). The SQS structures represent random mixing of Al and Si in the A sublattice of 312 MAX phase and their structural, electronic, and mechanical properties were calculated and compared with experiments. We study the cleavage and …