Unveiling the growth mechanism of Fe-containing intermetallics in Al–Si alloy in the perspective of surface stability and atom adsorption

Three-dimensional (3D) morphology and growth mechanism of β-AlFeSi, α-Al(FeMn)Si and α-Al(FeMnCr)Si phases were investigated by phase extraction and first-principles calculations. Experimental results showed that the 3D morphology of Fe-containing intermetallics change from plate-like to rhombic dodecahedron and regular hexahedron under the modification of Mn and Mn + Cr synergistic addition. First principles calculation results showed that the final 3D morphology of α-Al(FeMn)Si and α-Al(FeMnCr)Si phase are determined by the surface stability and growth competition of (100), (110) and (111) surface. The α-Al(FeMnCr)Si (100) surface exhibit a larger probability to be exposed due to the lower surface energy…

• NN
  National Natural Science Foundation of China

  Award: 52304369
• SK
  State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body

  Award: 32115007