Calculation and analysis of the influence of Si and Mg content on the mechanical performance parameters of Al-Si-Mg alloy
Based on the First Principles,using the CASTEP module and virtual crystal approximation model,utilizing GGA+PBE functional correlation function,the influence of composition on mechanical properties parameters in AlSi7Mg X(X=0.1～0.5)and AlSi XMg0.3(X=6～9)alloys was studied.It is shown that the lattice constant decreases with the increase of the content of the alloy elements,and there exists a difference of approximately 0.265%between the maximum and minimum values;the elastic constants C11,C12,and C44 meet the structural stability conditions.The volume elastic modulus B,shear modulus G,Young's modulus E,and Poisson's ratio u vary with Si and Mg content in A356 alloy.The change of Mg content has a more sensitive effect on the shear modulus G and Young's modulus E than the change of Si content.The comparison between the calculation results and existing experimental data shows that the calculation results are close to the experimental data,and it is feasible by using the First Principles to calculate the material parameters.
the First PrinciplesAl-Si-Mglattice constantelastic modulusPoisson's ratio
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