Tensile creep of polycrystalline near-stoichiometric NiAl

Raj, S. V.

doi:10.1016/s0921-5093(03)00137-0

Cited by 16 publications

(3 citation statements)

References 39 publications

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“…Amdry 386 showed superior creep properties compared to the Co-based bond coat Amdry 9954. The higher creep strength of β-NiAl, in contrast with the Ni-and Co-containing γ-solid solution phase, at temperatures above 900 • C, is responsible for the better creep resistance [24][25][26]. The higher yttrium content in Amdry 386 compared to Amdry 9954 led to the formation of smaller Y 2 O 3 particles.…”

Section: Discussionmentioning

confidence: 99%

Influence of Different Annealing Atmospheres on the Mechanical Properties of Freestanding MCrAlY Bond Coats Investigated by Micro-Tensile Creep Tests

Giese

Neumeier

Bergholz

et al. 2019

Metals

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The mechanical properties of low-pressure plasma sprayed (LPPS) MCrAlY (M = Ni, Co) bond coats, Amdry 386, Amdry 9954 and oxide dispersion strengthened (ODS) Amdry 9954 (named Amdry 9954 + ODS) were investigated after annealing in three atmospheres: Ar–O2, Ar–H2O, and Ar–H2–H2O. Freestanding bond coats were investigated to avoid any influence from the substrate. Miniaturized cylindrical tensile specimens were produced by a special grinding process and then tested in a thermomechanical analyzer (TMA) within a temperature range of 900–950 °C. Grain size and phase fraction of all bond coats were investigated by EBSD before testing and no difference in microstructure was revealed due to annealing in various atmospheres. The influence of annealing in different atmospheres on the creep strength was not very pronounced for the Co-based bond coats Amdry 9954 and Amdry 9954 + ODS in the tested conditions. The ODS bond coats revealed significantly higher creep strength but a lower strain to failure than the ODS-free Amdry 9954. The Ni-based bond coat Amdry 386 showed higher creep strength than Amdry 9954 due to the higher fraction of the β-NiAl phase. Additionally, its creep properties at 900 °C were much more affected by annealing in different atmospheres. The bond coat Amdry 386 annealed in an Ar–H2O atmosphere showed a significantly lower creep rate than the bond coat annealed in Ar–O2 and Ar–H2–H2O atmospheres.

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Section: Discussionmentioning

confidence: 99%

Influence of Different Annealing Atmospheres on the Mechanical Properties of Freestanding MCrAlY Bond Coats Investigated by Micro-Tensile Creep Tests

Giese

Neumeier

Bergholz

et al. 2019

Metals

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“…Studies have revealed that the creep strengths of monolithic intermetallics are inferior to advanced single crystal nickel-base superalloys [3][4][5] . Although the intermetallics based on the L12-ordered structure are attractive as high temperature structural materials because of their positive temperature dependence of yield strength, "the creep strength anomaly" does not exist in these intermetallics 4 .…”

Section: Introductionmentioning

confidence: 99%

“…Although the intermetallics based on the L12-ordered structure are attractive as high temperature structural materials because of their positive temperature dependence of yield strength, "the creep strength anomaly" does not exist in these intermetallics 4 . Large grained B2-ordered NiAl is known to be brittle at room temperature and to have poor creep strength at high temperatures 5 . For NiAl, significant improvements in creep strength were first demonstrated by forming a two phase mixture of NiAl and Ni2AlTi (Heusler phase), although this mixture is still extremely brittle at room temperature 6 .…”

Section: Introductionmentioning

confidence: 99%

Study on the Precipitation Strengthening in Ni-Al-Cr Alloy System

Oh¹,

Kim²,

Kil³

et al. 2014

Asian J. Chem.

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Transmission electron microscopic investigation has been performed concerning the effect of precipitation on the mechanical properties in Ni3Al-and NiAl-based intermetallics containing various types of fine precipitates. In an L12-ordered Ni3Al alloy with 4 mol. % of chromium and 0.2-3.0 mol % of carbon, fine octahedral precipitates of M23C6 type carbide, which has the cube-cube orientation relationship with the matrix, appear during aging. Typical Orowan loops are formed in Ni3Al containing fine dispersions of M23C6 particles. On the other hand, B2-ordered NiAl hardens appreciably by the precipitation of coherent α-Cr particles. By aging at temperatures around 973 K after solution annealing, fine spherical precipitates appeared homogeneously in the NiAl matrix. The selected area electron diffraction patterns have not revealed any additional extra-spots during aging, because the α-Cr particles have cube-cube orientation relationship and keep perfect coherency with the ordered matrix lattice. Dislocations bypass the particles during deformation. Although the dispersion of α-Cr particles increases the yield strength of NiAl at intermediate temperature, the strength decreases appreciably higher temperatures.

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RETRACTED ARTICLE: The behavior of α-Cr precipitation on the high temperature deformation of B2-ordered NiAl

2009

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Transmission electron microscope investigation has been performed concerning the effect of Cr-precipitation on the mechanical properties of B2-ordered NiAl containing 4 mol.% to 8 mol.% of Cr. By aging at temperatures around 973 K after solution annealing, fine spherical precipitates appeared homogeneously in the NiAl matrix and the alloys hardened appreciably. The selected area electron diffraction patterns have not revealed any additional extra-spots during aging, because the Cr-particles have a cube-cube orientation relationship and keep perfect coherency with the ordered matrix lattice. Dislocations bypass the particles during deformation. Although the dispersion of Cr-particles increases the yield strength of NiAl at intermediate temperature, the strength decreases appreciably at higher temperatures. Atom location by channeling enhanced microanalysis technique has been used to determine the site occupancy of Cr in NiAl.

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Tensile creep of polycrystalline near-stoichiometric NiAl

Cited by 16 publications

References 39 publications

Influence of Different Annealing Atmospheres on the Mechanical Properties of Freestanding MCrAlY Bond Coats Investigated by Micro-Tensile Creep Tests

Influence of Different Annealing Atmospheres on the Mechanical Properties of Freestanding MCrAlY Bond Coats Investigated by Micro-Tensile Creep Tests

Study on the Precipitation Strengthening in Ni-Al-Cr Alloy System

RETRACTED ARTICLE: The behavior of α-Cr precipitation on the high temperature deformation of B2-ordered NiAl

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