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In metal matrix composite materials consisting of oxide particles and Al alloys, including Mg as a solute atom, MgAl 2 O 4 spinels are formed at the interface between the particles and the matrix. In the present study, the scanning low energy electron microscopy (SLEEM) method has been applied to confirm morphologies of α-Al 2 O 3 particles and MgAl 2 O 4 spinel crystals grown on the alumina particles in the Al 2 O 3 /Al-1.0 mass% Mg 2 Si alloy composite material. The morphology of α-Al 2 O 3 particles before fabrication of the composite material was like a facetted barrel with 2 hexagonal (0001} and 6 trapezoidal {1101} planes. Spinels were formed on facets of Al 2 O 3 as small particles, and their shape was an octahedron consisting of 8 equiaxial triangles. Spinels and Al 2 O 3 particles keep their orientation relationship which was concluded by our recent TEM study: (111) MgAl2O4 // (0001) Al2O3 , [211] MgAl2O4 // [2110] Al2O3 , [110] MgAl2O4 // [1100] Al2O3 .

materials transactions

Morphology of Spinels and Al&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt; Particles in an Al&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt;/Al-Mg-Si Composite Material Revealed by Scanning Low Energy Electron Microscopy