Influence of fiber alignment on creep in directionally solidified NiAl–10Mo in-situ composites

Seemüller, C.; Heilmaier, Martin; Haenschke, T.; Bei, Hongbin; Dlouhý, A.; George, E.P.

doi:10.1016/j.intermet.2012.12.007

Cited by 19 publications

(6 citation statements)

References 16 publications

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“…The orientation relationship of the NiAl and the solid solution in the respective ternary alloys was previously investigated by several authors [3,4,7,8,10,11]. A cube-on-cube orientation relationship was reported which is in agreement with the results in this work, (100) NiAl || (100) (Cr,Mo) and 100 NiAl || 100 Cr,Mo (not shown here).…”

Section: Crystallographic Relationship Insupporting

confidence: 90%

“…It has been shown that alloying with refractory metals such as Cr, Mo, Re, V and W leads to quasi-binary eutectics [1,4]. The resulting microstructure is composed of NiAl as matrix and an embedded second phase, which causes a reinforcement [1,[8][9][10][11]. With this goal in mind, several directionally solidified NiAl-X alloys have been studied in the past, namely NiAl-10Mo (in what follows all concentrations are given in at.% unless otherwise stated) [1][2][3][4]8,[10][11][12][13],…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microstructural Investigations of Novel High Temperature Alloys Based on NiAl-(Cr,Mo)

Gombola

Kauffmann

Geramifard

et al. 2020

Metals

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Apart from the reported transition from the fibrous morphology in NiAl-34Cr to lamellae by adding 0.6 at.% Mo, further morphology transformations along the eutectic trough in the NiAl-(Cr,Mo) alloys were observed. Compositions with at least 10.3 at.% Cr have lamellar morphology while the first tendency to fiber formation was found at 9.6 at.% Cr. There is a compositional range, where both lamellae and fibers are present in the microstructure and a further decrease in Cr to 1.8at.% Cr results in fully fibrous morphology. Alongside these morphology changes of the (Cr,Mo)ss reinforcing phase, its volume fraction was found to be from 41 to 11 vol.% confirming the trend predicted by the CALPHAD approach. For mixed morphologies in-situ X-ray diffraction experiments performed between room and liquidus temperature accompanied by EDX measurements reveal the formation of a gradient in composition for the solid solution. A new Mo-rich NiAl-9.6Cr-10.3Mo alloy clearly shows this effect in the as-cast state. Moreover, crystallographic orientation examination yields two different types of colonies in this composition. In the first colony type, the orientation relationship between NiAl matrix and (Cr,Mo)ss reinforcing phase was ( 100 ) NiAl|| ( 100 ) Cr,Mo and ⟨ 100 ⟩ NiAl|| ⟨ 100 ⟩ Cr,Mo. An orientation relationship described by a rotation of almost 60° about ⟨ 111 ⟩ was found in the second colony type. In both cases, no distinct crystallographic plane as phase boundary was observed.

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Section: Crystallographic Relationship Insupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Microstructural Investigations of Novel High Temperature Alloys Based on NiAl-(Cr,Mo)

Gombola

Kauffmann

Geramifard

et al. 2020

Metals

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“…For NiAl‐Mo, FFT‐based computations predicted a decrease in creep strength by roughly four orders of magnitude down to the level of pure NiAl in case of off‐axis loading . Similarly, Seemüller et al experimentally observed a considerable increase in creep rate for NiAl‐Mo with a high content of misaligned fibers. Thus, we conclude that the cellular laminate structure of NiAl‐Cr(Mo) leads to a weaker anisotropy and a larger robustness against misaligned loading compared to fibrous materials with a similar composition.…”

Section: Numerical Demonstrationsmentioning

confidence: 88%

On Quasi‐Newton methods in fast Fourier transform‐based micromechanics

Wicht

Schneider

Böhlke

2019

Numerical Meth Engineering

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SUMMARY This work is devoted to investigating the computational power of Quasi‐Newton methods in the context of fast Fourier transform (FFT)‐based computational micromechanics. We revisit FFT‐based Newton‐Krylov solvers as well as modern Quasi‐Newton approaches such as the recently introduced Anderson accelerated basic scheme. In this context, we propose two algorithms based on the Broyden‐Fletcher‐Goldfarb‐Shanno (BFGS) method, one of the most powerful Quasi‐Newton schemes. To be specific, we use the BFGS update formula to approximate the global Hessian or, alternatively, the local material tangent stiffness. Both for Newton and Quasi‐Newton methods, a globalization technique is necessary to ensure global convergence. Specific to the FFT‐based context, we promote a Dong‐type line search, avoiding function evaluations altogether. Furthermore, we investigate the influence of the forcing term, that is, the accuracy for solving the linear system, on the overall performance of inexact (Quasi‐)Newton methods. This work concludes with numerical experiments, comparing the convergence characteristics and runtime of the proposed techniques for complex microstructures with nonlinear material behavior and finite as well as infinite material contrast.

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“…Moreover, the here chosen systems reveal a better creep resistance compared to NiAl-V [22]. Due to this, several experimental studies of the directionally solidified ternary alloys NiAl-Mo [23][24][25][26][27][28] and NiAl-Cr [28][29][30][31] have been conducted in the past.…”

Section: The Quaternary System Nial-(crmo)mentioning

confidence: 97%

Phase-Field Simulation of the Microstructure Evolution in the Eutectic Alloy NiAl-31Cr-3Mo

et al. 2023

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The directionally solidified eutectic alloy NiAl-(Cr,Mo) is a promising candidate for structural applications at high temperatures, due to its increased creep resistance compared to its single phase B2ordered NiAl counterpart. This system yields an eutectic trough connecting the invariant reactions of the ternary alloys NiAl-Cr and NiAl-Mo. During directional solidification (DS) along this trough the evolved microstructures of the two-phase eutectic is changing from fibrous to lamellar and back to fibrous morphology while increasing and decreasing the amounts of Mo and Cr, respectively. To investigate these effects in the morphology, the phase-field method has proven to be predestined in the last decades. However, as the modeling of quaternary systems is challenging for the simulation with a grand potential based phase-field model, the focus of this work is on the generation of a material model for one defined compound namely NiAl-31Cr-3Mo. The modeling is validated by investigating the microstructure evolution in two- and three-dimensional simulations of the DS process for two different growth velocities and by investigating their undercooling spacing relationships. The evolving microstructures obtained from three-dimensional large-scale simulations are presented and validated with corresponding micrographs from scanning electron microscopy (SEM) of directionally solidified samples with the same growth velocities. The simulation results show the theoretically expected behaviors and are in qualitative and quantitative accordance with DS experiments. The study of NiAl-31Cr-3Mo serves as the basis for a comprehensive data-driven analysis of microstructure properties and system quantities of the entire quaternary material NiAl-(Cr,Mo). With this, an accelerated design of advanced materials is promoted.

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Influence of fiber alignment on creep in directionally solidified NiAl–10Mo in-situ composites

Cited by 19 publications

References 16 publications

Microstructural Investigations of Novel High Temperature Alloys Based on NiAl-(Cr,Mo)

Microstructural Investigations of Novel High Temperature Alloys Based on NiAl-(Cr,Mo)

On Quasi‐Newton methods in fast Fourier transform‐based micromechanics

Phase-Field Simulation of the Microstructure Evolution in the Eutectic Alloy NiAl-31Cr-3Mo

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