Journal article

The nature of the dispersoids in INCONEL alloy M A6000

GB Schaffer, MH Loretto, RE Smallman, JW Brooks

Journal of Materials Science | Published : 1989

Abstract

Analytical transmission electron microscopy has been used to examine the oxide dispersion in the mechanically alloyed, nickel-based, dispersion strengthened superalloy INCONEL alloy MA6000. Four mixed AI-Y oxides were identified in consolidated powder: Y3Al5O12, yttrium aluminium garnet (YAG); YAIO3, yttrium aluminium perovskite (YAP); Y4Al2O9, yttrium aluminium monoclinic (YAM), and a previously unidentified YAlOI3 polymorph. This new phase, designated yttrium aluminium hexagonal (YAH), has lattice parameters of a = 2.206 ±0.035 nm and c = 3.219 ± 0.096 nm, a space group of P63mc and consists of 18 closepacked oxygen layers with the yttrium and aluminium cations in the resulting interstices..

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