A1-L12 Structures in the Al-Co-Ni-Ti Quaternary Phase System

James P. Minshull; Steffen Neumeier; Mattew G. Tucker; Howard James Stone

doi:10.4028/www.scientific.net/AMR.278.399

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 278A1-L12 Structures in the Al-Co-Ni-Ti Quaternary...

A1-L1₂ Structures in the Al-Co-Ni-Ti Quaternary Phase System

Abstract:

The phase constituents of alloys from the (Ni,Co)85(Al,Ti)15 plane of the Ni-Co-Al-Ti quaternary system were investigated following prolonged exposure at 750°C. Microstructural investigations confirmed the existence of a continuous A1-L12 two-phase region in the Ni-Co-Al-Ti quaternary system between Ni-Ni3Al and Co-Co3Ti. The lattice misfits of alloys from this quaternary system were determined using neutron diffraction. With increasing contents of Ti the positive lattice misfit increases up to +0.79% in the Ti-containing alloys, which leads to an increasing tetragonal distortion of the  matrix phase due to the increasing coherency stresses.

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Periodical:

Advanced Materials Research (Volume 278)

Pages:

399-404

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.278.399

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Online since:

July 2011

Authors:

James P. Minshull, Steffen Neumeier, Mattew G. Tucker, Howard James Stone

Keywords:

Lattice Misfit, Neutron Diffraction, Ni-Co-Superalloys, Phase Diagram

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