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Metallurgical and Materials Transactions A
Published in: Metallurgical and Materials Transactions A 4/2012

01-04-2012

The Influence of Cr on the Solidification Behavior of Polycrystalline γ(Ni)/γ′(Ni3Al)-δ(Ni3Nb) Eutectic Ni-Base Superalloys

Authors: Mengtao Xie, Randolph Helmink, Sammy Tin

Published in: Metallurgical and Materials Transactions A | Issue 4/2012

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Abstract

In the current investigation, the effect of Cr on the solidification characteristics and as-cast microstructure of pseudobinary γ-δ eutectic alloys based on a near-eutectic composition (Ni-5.5Al-13.5Nb at. pct) was investigated. It was found that Cr additions promote the formation of a higher volume fraction of γ-δ eutectic microstructure in the interdendritic region. Increasing levels of Cr also triggered morphological changes in the γ-δ eutectic and the formation of γ-γ′-δ ternary eutectic during the last stage of solidification. A detailed characterization of the as-cast alloys also revealed that Cr additions suppressed the liquidus, solidus, and γ′ precipitation temperature of these γ/γ′-δ eutectic alloys. A comparison of the experimental results with thermodynamic calculations using the CompuTherm Pandat database (CompuTherm LLC, Madison, WI) showed qualitative agreement.
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Metadata
Title
The Influence of Cr on the Solidification Behavior of Polycrystalline γ(Ni)/γ′(Ni3Al)-δ(Ni3Nb) Eutectic Ni-Base Superalloys
Authors
Mengtao Xie
Randolph Helmink
Sammy Tin
Publication date
01-04-2012
Publisher
Springer US
Published in
Metallurgical and Materials Transactions A / Issue 4/2012
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-011-0969-4

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