The effects of ruthenium additions on tensile deformation mechanisms of single crystal superalloys at different temperatures

Wang, X.G.; Liu, J.L.; Jin, Tao; Sun, Xiaofeng

doi:10.1016/j.matdes.2014.06.009

Cited by 62 publications

(21 citation statements)

References 33 publications

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“…1). Thereof, in the BCC/B2 regions with a very high Al content, the ordered B2 phase becomes the matrix, and the disorder BCC is the precipitated phase with a spherical morphology, which is contrary to the common image that the ordered phase is always precipitated on the disordered BCC matrix [30][31][32][33][34][35].…”

Section: Microscopic Morphologies Of Bcc/b2 Phases In Heasmentioning

confidence: 95%

“…Especially, the shape of the precipitates is closely related to the lattice misfit, ε, between the precipitated phase and the matrix phase [28,[30][31][32][33][34][35][36][37]. Generally speaking, a smaller lattice misfit, ε, leads to a spherical shape, and when the misfit becomes larger, it is difficult to control the morphology of the precipitates, and the coherency between them will disappear gradually, resulting in coarse second particles finally.…”

Section: Microscopic Morphologies Of Bcc/b2 Phases In Heasmentioning

confidence: 99%

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The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

Ma¹,

Jiang²,

Li³

et al. 2017

Preprint

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Abstract:The present work investigates primarily the morphology evolution of the body-centeredcubic (BCC)/B2 phases in AlxNiCoFeCr high-entropy alloys (HEAs) with increasing Al content, which has been neglected so far. There exist two types of microscopic morphologies of BCC and B2 phases in this HEA series: one is the weave-like morphology induced by the spinodal decomposition, and the other is the microstructure of a spherical disordered BCC precipitation on the ordered B2 matrix that appears in HEAs with a much higher Al content. The shape of coherent precipitates is found to be closely related to the lattice misfit between BCC and B2 phases, which is sensitive to Al. The mechanical properties, including the compressive yielding strength and microhardness of the AlxNiCoFeCr HEAs, are also discussed in light of the concept of the valence electron concentration (VEC).

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Section: Microscopic Morphologies Of Bcc/b2 Phases In Heasmentioning

confidence: 95%

Section: Microscopic Morphologies Of Bcc/b2 Phases In Heasmentioning

confidence: 99%

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

Ma¹,

Jiang²,

Li³

et al. 2017

Preprint

View full text Add to dashboard Cite

show abstract

“…These two kinds of BCC/B2 microstructures are resulted from the composition segregation, which could be also verified by the XRD results that the diffraction peaks of BCC and B2 phases are widened clearly (Figure 1). Thereof, in the BCC/B2 regions with a very high Al content, the ordered B2 phase becomes the matrix, and the disorder BCC is the precipitated phase with a spherical morphology, which is contrary to the common image that the ordered phase is always precipitated on the disordered BCC matrix [30][31][32][33][34][35][36].…”

Section: Microscopic Morphologies Of Bcc/b2 Phases In Heasmentioning

confidence: 96%

“…Especially if the shape of the precipitates is closely related to the lattice misfit, ε, between the precipitated phase and the matrix phase [29,[31][32][33][34][35][36][37][38]. Generally speaking, a smaller …”

Section: Microscopic Morphologies Of Bcc/b2 Phases In Heasmentioning

confidence: 99%

“…Only a moderate ε, neither large nor small, can produce cuboidal coherent precipitates, leading to excellent mechanical properties. Such a case is common in Ni-based superalloys [33,34], in which the cuboidal ordered nanoparticles with a L1 2 structure (Ni 3 Al-type) are coherently embedded into the disordered FCC matrix, exhibiting an incomparable mechanical property at high temperatures. While in sharp contrast, the weave-like spinodal morphology of ordered and disordered coherent phases with a relatively-larger ε will deteriorate alloy properties, as exemplified by the brittle AlNiCoFeCr HEA [19].…”

Section: Microscopic Morphologies Of Bcc/b2 Phases In Heasmentioning

confidence: 99%

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The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

Jiang

et al. 2017

Metals

130

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Abstract:The present work primarily investigates the morphological evolution of the body-centered-cubic (BCC)/B2 phases in Al x NiCoFeCr high-entropy alloys (HEAs) with increasing Al content. It is found that the BCC/B2 coherent morphology is closely related to the lattice misfit between these two phases, which is sensitive to Al. There are two types of microscopic BCC/B2 morphologies in this HEA series: one is the weave-like morphology induced by the spinodal decomposition, and the other is the microstructure of a spherical disordered BCC precipitation on the ordered B2 matrix that appears in HEAs with a much higher Al content. The mechanical properties, including the compressive yielding strength and microhardness of the Al x NiCoFeCr HEAs, are also discussed in light of the concept of the valence electron concentration (VEC).

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Effects of Temperature and Stress on Microstructural Evolution during Creep Deformation of Ru‐free and Ru‐containing Single Crystal Superalloys

et al. 2014

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Effects of temperature and stress on microstructural evolution of the two experimental alloys at various conditions have been studied after creep deformation. The topological inversion has been observed under certain conditions, and it is more pronounced at the same temperature but lower stress levels. Ru additions support the topological inversion, especially at very high temperature. In addition, the g/g 0 interfacial networks have been observed by SEM after deep etching. Moreover, the a<101> superdislocations only present at relatively high temperature in this work, however, it is expected at each temperature at stresses above a critical level. At last, the a<010> superdislocations have also been identified and it is considered more energetically favorable than that of the a<101> superdislocations.

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The effects of ruthenium additions on tensile deformation mechanisms of single crystal superalloys at different temperatures

Cited by 62 publications

References 33 publications

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

Effects of Temperature and Stress on Microstructural Evolution during Creep Deformation of Ru‐free and Ru‐containing Single Crystal Superalloys

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