SEM Images	Mehlum Curvature Maps	Furrows Maps
Surface 1 KIc = 0.457 MPa√m 50–80% of alumina Black and cubic grains
Surface 2 KIc = 0.503 MPa√m 50–80% of alumina Black and cubic grains
Surface 3 KIc = 0.682 MPa√m 10–30% of alumina White and cubic grains
Surface 4 KIc = 0.683 MPa√m 10–30% of alumina White and spherical grains
Surface 5 KIc = 0.553 MPa√m 30–50% of alumina White and spherical grains
Surface 6 KIc = 0.557 MPa√m 30–50% of alumina White and cubic grains