Effect of Process on Microstructure and Elevated Temperature Mechanical Behavior of Multi-Phase NiAl-Fe(Nb) Alloy

Ping Han; Jian Ting Guo

doi:10.4028/www.scientific.net/AMR.299-300.163

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 299-300Effect of Process on Microstructure and Elevated...

Effect of Process on Microstructure and Elevated Temperature Mechanical Behavior of Multi-Phase NiAl-Fe(Nb) Alloy

Abstract:

The microstructure and elevated temperature mechanical behavior of as-cast, HIPed and directionally solidified NiAl-Fe(Nb) Alloys have been investigated. The results show that the microstructure of as-cast NiAl-Fe(Nb) alloy consists of dendritic regions (b) and interdendritic regions (g/g¢) with non-continuous NbNiAl(Laves) phase segregating at the interfaces of b and g/g¢ phases. The HIP processing does not alter the microstructure of as-cast alloy. The longitudinal dendritic microstructure of the DS NiAl-Fe(Nb) alloy is regular. Room temperature elongations of as-cast and HIPed NiAl-Fe(Nb) alloys are all zero, however, 0.4% for the DS alloy. The strength and elongation of the HIPed alloy are higher than that of as-cast alloy. The yield strength and ultimate strength of the DS alloy are equivalent to that of as-cast alloy, but elongation of the DS alloy is higher than that of as-cast alloy, the elongation exceed 100% at 1273K, which indicates that the DS alloy can be deformed superplastically.

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Periodical:

Advanced Materials Research (Volumes 299-300)

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163-166

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https://doi.org/10.4028/www.scientific.net/AMR.299-300.163

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Online since:

July 2011

Authors:

Ping Han, Jian Ting Guo

Keywords:

Directional Solidification, Hot Isostatic Pressing (HIP), Mechanical Behavior, Microstructure, NiAl Alloy

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