Intergrowth of P phase with µ phase in a Ru-containing single-crystal Ni-based superalloy

Tan, Xipeng; Liu, J. L.; Jin, Tao; Hu, Z.Q.; Hong, Hyun-Uk; Choi, Baig-Gyu; Kim, I. S.; Jo, Chang-Yong

doi:10.1080/09500839.2012.700409

Cited by 31 publications

(7 citation statements)

References 23 publications

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“…• C was also observed in Alloy 800 by Darolia et al [6] and in Ru-containing single-crystal superalloy by Tan et al [11]. It has been reported that P phase is more thermodynamically stable than σ and µ phases and would exist as only phase at temperature above 1100…”

Section: Resultsmentioning

confidence: 62%

Analytical Electron Microscopy Investigation of Topologically Close-Packed Phases in CMSX-4 Single Crystal Superalloy

et al. 2016

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In this work the topologically close-packed phases precipitated during annealing of CMSX-4 single-crystal superalloy at temperature 1100• C were investigated. Microstructural analyses were carried out by means of scanningand transmission electron microscopy as well as scanning-transmission electron microscopy in high angle annular dark field mode. Chemical composition in nanoareas was determined using energy dispersive X-ray spectroscopy. Scanning electron microscopy investigation has shown that the topologically close-packed precipitates were formed already after 50 h of annealing at temperature 1000• C. With prolongation of the annealing time up to 2500 h the change of the morphology of topologically close-packed particles from blocky to needle-like occurred. Selected area electron diffraction analysis indicated that the topologically close-packed precipitates are the orthorhombic P phase. Quantitative energy dispersive X-ray spectroscopy analysis revealed that the topologically close-packed precipitates are enriched mostly in Re and W.

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Section: Resultsmentioning

confidence: 62%

Analytical Electron Microscopy Investigation of Topologically Close-Packed Phases in CMSX-4 Single Crystal Superalloy

et al. 2016

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“…During the decomposition of α′ into α, vanadium is constantly rejected from the forming α phase and diffuse along accommodation twin boundaries and/or stacking faults towards the boundaries between adjacent α′ martensite plates. The intergrowth of α within α ′plates could be taken into account as planar defects driven growth, which can refer to the author’s previous work 20 . Discrete β particles will first form along α′ martensite plate boundaries and then continuously grow at expense of vanadium (ii → iii).…”

Section: Resultsmentioning

confidence: 99%

Revealing martensitic transformation and α/β interface evolution in electron beam melting three-dimensional-printed Ti-6Al-4V

Tan

Kok

Toh

et al. 2016

Sci Rep

138

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As an important metal three-dimensional printing technology, electron beam melting (EBM) is gaining increasing attention due to its huge potential applications in aerospace and biomedical fields. EBM processing of Ti-6Al-4V as well as its microstructure and mechanical properties were extensively investigated. However, it is still lack of quantitative studies regarding its microstructural evolution, indicative of EBM thermal process. Here, we report α′ martensitic transformation and α/β interface evolution in varied printing thicknesses of EBM-printed Ti-6Al-4V block samples by means of atom probe tomography. Quantitative chemical composition analysis suggests a general phase transformation sequence. By increasing in-fill hatched thickness, elemental partitioning ratios arise and β volume fraction is increased. Furthermore, we observe kinetic vanadium segregation and aluminum depletion at interface front and the resultant α/β interface widening phenomenon. It may give rise to an increased α/β lattice mismatch and weakened α/β interfaces, which could account for the degraded strength as printing thickness increases.

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“…It has been reported that the coprecipitates of the P and μ phases are present in a ruthenium‐containing experimental SC superalloy (Tan et al ., ) and the secondary reaction zone in a coated CMSX‐4 superalloy (Tan et al ., ), but up to now this phenomenon has not been observed in bulk CMSX‐4. Equilibrium phase diagrams for the CMSX‐4 superalloy predict that the μ phase is stable at temperature below 1100°C, whereas at higher temperatures the P phase is more stable (Saunders et al ., ).…”

Section: Resultsmentioning

confidence: 99%

“…Unfortunately, the presence of heavy elements promotes the precipitation of brittle TCP phases after long exposure at high temperatures above 900°C (Darolia et al, 1988;Rae et al, 2000;Rae & Reed, 2001;Cheng et al, 2011;Matuszewski et al, 2015). To describe the structure of TCP phases, several approaches, such as Kasper coordination polyhedra, atomic layers, structural units, etc., have been employed (Tan et al, 2012). Four types of TCP phases, namely, σ (tetragonal, P4 2 /mnm), μ (trigonal, R-3m), P (orthorhombic, Pnma) and R (rhombohedral, R-3) can occur in different superalloys (Darolia et al, 1988;Rae et al, 2000;Reed, 2006).…”

Section: Introductionmentioning

confidence: 99%

Characterization of the μ and P phase precipitates in the CMSX‐4 single crystal superalloy

Dubiel

Indyka

Moskalewicz

et al. 2017

Journal of Microscopy

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A combination of scanning electron microscopy (SEM), transmission electron microscopy (TEM) and scanning-transmission electron microscopy (STEM) using high-angle annular-dark-field (HAADF) imaging, focussed ion beam- scanning electron microscopy (FIB-SEM) tomography, selected area electron diffraction with beam precession (PED), as well as spatially resolved energy-dispersive X-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS), was used to investigate topologically close-packed (TCP) phases, occurring in the CMSX-4 superalloy subjected to high temperature annealing and creep deformation. Structural and chemical analyses were performed to identify the TCP phases and provide information concerning the compositional partitioning of elements between them. The results of SEM and FIB-SEM tomography revealed the presence of merged TCP particles, which were identified by TEM and PED analysis as coprecipitates of the μ and P phases. Inside the TCP particles that were several micrometres in size, platelets of alternating μ and P phases of nanometric width were found. The combination of STEM-HAADF imaging with spatially resolved EDS and EELS microanalysis allowed determination of the significant partitioning of the constituent elements between the μ and P phases.

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Intergrowth of P phase with µ phase in a Ru-containing single-crystal Ni-based superalloy

Cited by 31 publications

References 23 publications

Analytical Electron Microscopy Investigation of Topologically Close-Packed Phases in CMSX-4 Single Crystal Superalloy

Analytical Electron Microscopy Investigation of Topologically Close-Packed Phases in CMSX-4 Single Crystal Superalloy

Revealing martensitic transformation and α/β interface evolution in electron beam melting three-dimensional-printed Ti-6Al-4V

Characterization of the μ and P phase precipitates in the CMSX‐4 single crystal superalloy

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