Characterization of nanoscale NiAl-type precipitates in a ferritic steel by electron microscopy and atom probe tomography

Teng, Zhenke; Miller, M.K.; Ghosh, Gautam; Liu, Chang; Huang, Shenyan; Russell, K.F.; Fine, M. E.; Liaw, Peter K.

doi:10.1016/j.scriptamat.2010.03.013

Cited by 98 publications

(76 citation statements)

References 17 publications

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“…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: 95%

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The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

Jiang

et al. 2017

Metals

126

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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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Section: Microscopic Morphologies Of Bcc/b2 Phases In Heasmentioning

confidence: 95%

“…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%

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

Jiang

et al. 2017

Metals

126

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show abstract

“…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: 96%

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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“…However, for NiMn, NiAl, Ni 2 AlMn, Ni 2 AlTi, and Cu, these phases are not predicted in the equilibrium phase diagrams of the respective systems, as some of these phases are metastable [16,59]. Nevertheless, x 0 can be computed by using the lever rule [67]. For instance, in NiMn, x 0 = min(x Ni ,x Mn ), where the min function limits the increase in the particle fraction by the constituent with minimum content; similarly for Ni 2 TiAl, it gives ; the second min function is to account for gradual transition from B2 to L2 1 [68].…”

Section: Modelling Precipitation Kineticsmentioning

confidence: 99%