Direct Determination Of γ′ / γ′+γ / γ Phase Boundaries In Ni-Al-Cr System Based On Enthalpy Of Formation Results Obtained By Calorimetric Solution Method

The work is a continuation of the research carried out on a high-temperature calorimeter solution type on alloys from Ni-Al-Cr system. Thanks to the construction innovation introduced by authors the device allows the determination of the formation enthalpy of alloys at ambient and elevated temperatu...

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Bibliographic Details
Published in:Archives of metallurgy and materials 2015-09, Vol.60 (3), p.1657-1662
Main Authors: Maciąg, T., Rzyman, K., Węcki, B.
Format: Article
Language:English
Subjects:
enthalpy of formation
intermetallic phase
phase boundary
solution calorimetry
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Summary:The work is a continuation of the research carried out on a high-temperature calorimeter solution type on alloys from Ni-Al-Cr system. Thanks to the construction innovation introduced by authors the device allows the determination of the formation enthalpy of alloys at ambient and elevated temperatures. Experiments described in this article were carried out at three temperatures: 873K, 996K and 1150K on the alloys of the chemical compositions from the Ni Al ÷ Ni Cr section of the Ni-Al-Cr system. On the basis of changes in the enthalpy of formation with increasing chromium content of the alloys, points corresponding to places of phase boundaries γ′ / γ′+γ / γ in Ni-Al-Cr system were determined. A similar relationship was observed in previous studies of alloys from Ni Al ÷Ni Cr section. For precise determination of these characteristic points a statistical model was applied
ISSN:2300-1909
2300-1909
DOI:10.1515/amm-2015-0288