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Determination of γ/γ′ Lattice Misfit in Ni-Based Single-Crystal Superalloys at High Temperatures by Neutron Diffraction.

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Title: Determination of γ/γ′ Lattice Misfit in Ni-Based Single-Crystal Superalloys at High Temperatures by Neutron Diffraction.
Authors: Huang, Shenyan1 maxinehuanghsy@gmail.com, An, Ke2, Gao, Yan1, Suzuki, Akane1
Source: Metallurgical & Materials Transactions. Part A. Mar2018, Vol. 49 Issue 3, p740-751. 12p. 1 Color Photograph, 2 Charts, 9 Graphs.
Subjects: Heat resistant alloys, Neutron diffraction crystallography, Lattice constants, Neutron diffraction, Heat treatment of metals
Abstract: Constrained γ/γ′ lattice misfit as a function of temperature (room temperature, 871 °C, 982 °C, 1093 °C, and 1204 °C) is measured by neutron diffraction on the first-generation Ni-based single-crystal superalloy René N4 and second-generation superalloys René N5, CMSX4, and PWA1484. All the alloys studied show negative misfit at temperatures above 871 °C. For René N4, René N5, and PWA1484, the misfit becomes less negative at temperatures above 1093 °C, possibly due to either the chemistry effect or internal stress relaxation. The magnitude of the misfit shows a qualitative agreement with Caron’s misfit model based on Vegard’s coefficients. The Re-free alloy René N4 was found to have a larger γ lattice parameter and γ/γ′ misfit due to higher fractions of Cr, Ti, and Mo. After 100 hours of annealing at high temperatures, René N5 shows a more negative misfit than the misfit after the standard heat treatment. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Constrained <italic>γ</italic>/<italic>γ′</italic> lattice misfit as a function of temperature (room temperature, 871 °C, 982 °C, 1093 °C, and 1204 °C) is measured by neutron diffraction on the first-generation Ni-based single-crystal superalloy René N4 and second-generation superalloys René N5, CMSX4, and PWA1484. All the alloys studied show negative misfit at temperatures above 871 °C. For René N4, René N5, and PWA1484, the misfit becomes less negative at temperatures above 1093 °C, possibly due to either the chemistry effect or internal stress relaxation. The magnitude of the misfit shows a qualitative agreement with Caron’s misfit model based on Vegard’s coefficients. The Re-free alloy René N4 was found to have a larger <italic>γ</italic> lattice parameter and <italic>γ</italic>/<italic>γ</italic>′ misfit due to higher fractions of Cr, Ti, and Mo. After 100 hours of annealing at high temperatures, René N5 shows a more negative misfit than the misfit after the standard heat treatment. [ABSTRACT FROM AUTHOR]
ISSN:10735623
DOI:10.1007/s11661-017-4455-5