Subsolidus phase relationships in the system Dy 2O 3-Si 3N 4-AlN-Al 2O 3

Abstract

Subsolidus phase relationships in the system Dy-Si-Al-O-N have been determined. Forty-two compatibility tetrahedra were established in the region Dy 2O 3-Si 3N 4-AlN-Al 2O 3. Within this region, DyAG(Dy 3-Al 5O 12) and M′-phase (Dy 2Si 3 − xAl xO 3 + xN 4 − x) are the only two important compounds which have tie lines joined to β-sialon and AlN polytypoid phases. α-Sialon coexists with both M′ phase and DyAG (only with oxygen-rich α′).