You will obtain a very inhomogeneous mixture of Al2O3 and Fe2O3, not a nano-composite.

I do agree with Urszula,

However, if you use WC balls and long milling times, you have a chance. However, you should prevent sticking Iron on your vial walls.

cela dépend des conditions de broyage et de l’atmosphère de broyage

si c'est sous vide,  la contamination par l’Oxygène est diminuée.

we can also have iron oxides.

thank's for all