COMBINED EFFECTS OF CERIUM AND BORON ON THE MECHANICAL-PROPERTIES ANDOXIDATION BEHAVIOR OF NI3AL ALLOY

The combined effects of cerium and boron additions on the room-tempera ture tensile properties and high-temperature oxidation behaviour of Ni 3Al alloys: alloy 1 doped with cerium, alloy 2 doped with boron, and a lloy 3 doped with both 3 cerium and boron. The strength, ductility and oxidation behaviour of the alloy are more effectively improved by com bined cerium and boron additions than by cerium or by boron addition a lone. Of the three alloys, alloy 3 exhibits comprehensively the best m echanical properties and oxidation resistance. Alloy 2 presents the be tter mechanical properties than alloy 1; nevertheless, alloy 1 has the better oxidation resistance than alloy 2.