Physically motivated model for creep of directionally solidified eutectics evaluated for the intermetallic NiAl–9Mo

Albiez, J.; Sprenger, Ioannis; Seemüller, C.; Weygand, D.; Heilmaier, Martin; Böhlke, Thomas

doi:10.1016/j.actamat.2016.02.024

Cited by 27 publications

(19 citation statements)

References 40 publications

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“…As a result, the dislocation density increases and, thus, leads to the softening of the lamella which induces the increase of the creep rate in the ternary creep regime. In summary, it can concluded that the creep model described in [3] can also be applied for DS eutectics having a NiAl matrix but a lamellar reinforcement. This should, nevertheless, be further investigated by several creep tests under various thermo-mechanical conditions.…”

Section: Resultsmentioning

confidence: 99%

“…Simulation model: The model for the simulation of the creep behavior of the DS NiAl-31Cr-3Mo eutectic will be briefly introduced in the following, whereas reference is made to [3] for more precise details. The multiplicative decomposition of the deformation gradient F = F e F p into an elastic part F e and a plastic part F p is used under the assumption of the elastic isomorphism [6].…”

Section: Modeling Of the Creep Behaviormentioning

confidence: 99%

“…Here, n denotes the stress exponent,γ 0 the reference shear rate, and τ F α the hardening variable, whereas an isotropic hardening approach τ modeled by an ideal plastic behavior τ F = τ 0 . The hardening behavior of the lamella is described according to [3] by…”

Section: Modeling Of the Creep Behaviormentioning

confidence: 99%

“…By controlling the growth rate and the chemical composition, a well-aligned fibrous or lamellar microstructure can be created by the DS of the eutectic NiAl-(Cr,Mo) [2]. A physically motivated model for the creep behavior of directionally solidified eutectics was introduced and evaluated for DS NiAl-9Mo with a well-aligned fibrous microstructure [3]. This model considers the transition from theoretical strength to bulk strength.…”

Section: Introductionmentioning

confidence: 99%

“…It was shown that the model is able to predict the material's behavior of DS NiAl-9Mo under various thermo-mechanical loadings. In order to validate the proposed model in [3] also for lamellar materials, a simulated creep curve for the DS NiAl-31Cr-3Mo is compared to an experimentally measured one. This material possesses a NiAl matrix with ≈ 46 vol.-% (Cr,Mo)-lamellar reinforcements which are arranged parallel to the loading direction.…”

Section: Introductionmentioning

confidence: 99%

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Validation of the applicability of a creep model for directionally solidified eutectics with a lamellar microstructure

Albiez

Sprenger

Weygand

et al. 2016

Proc Appl Math and Mech

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Depending on the process parameters, the directional solidification (DS) of eutectic alloys leads to a fibrous or lamellar microstructure. A physically motivated creep model which was evaluated for a DS-eutectic with a fibrous microstructure is applied to a DS-eutectic with a lamellar microstructure. Creep curves are simulated and compared to experimentally measured ones. It is shown, that the simulation is in good agreement with the experiment.

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Section: Resultsmentioning

confidence: 99%

Section: Modeling Of the Creep Behaviormentioning

confidence: 99%

Section: Modeling Of the Creep Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Validation of the applicability of a creep model for directionally solidified eutectics with a lamellar microstructure

Albiez

Sprenger

Weygand

et al. 2016

Proc Appl Math and Mech

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A Novel Method for Preparing Intermetallics/Superalloy Dissimilar Materials Using Current Sintering of Metallic Powders

Ning,

Wang,

Qin

et al. 2023

Adv Eng Mater

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In this paper, a novel method is proposed to prepare the multi‐material composite component for aerospace application using the current sintering. Two representative high‐temperature structural materials, the new potential intermetallic NiAl and the widely used Ni‐based superalloy K4202, have been employed to achieve the target. As shown by the results, a clean interface with almost no defects was successfully obtained in NiAl/K4202 alloy. Nevertheless, the existence of continuous Cr(Mo) phase along the region leads to an insufficient bonding ability. To optimize the interfacial microstructure, a Ni foil is employed as the interlayer. The results indicate that the interlayer could hinder the intense diffusion of elements and prevent the abnormal growth of Cr(Mo) phases, which results in a considerable improvement of interfacial properties.This article is protected by copyright. All rights reserved.

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The Creep‐Induced Micro‐ and Nanostructural Evolution of a Eutectic Mo–Si–Ti Alloy at 1200 °C

Thota,

Schliephake,

Kauffmann

et al. 2024

Adv Eng Mater

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The present study verified the creep deformation mechanisms of a eutectic Mo‐Si‐Ti alloy (comprising a body‐centered solid solution and a hexagonal silicide). The microstructural changes occurring at the various microstructural length scales were correlated to the nature of the creep curve. The creep curve exhibits a transient strain‐hardening region followed by a distinct minimum and then creep rate accelerates after that. The formation of a high fraction of disperse (Ti,Mo)5Si3 precipitates in the solid solution lead to significant strengthening in the transient creep regime. By the simultaneous decrease of the initially high dislocation density in the solid solution, diffusional creep contributes to effective creep behavior. At the minimum, the load and strain are also carried by the silicide phase which undergoes plastic deformation. Continuous coarsening of precipitates and loss of precipitation strengthening in the solid solution and dynamic recovery in the silicide phase lead to creep acceleration.This article is protected by copyright. All rights reserved.

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Physically motivated model for creep of directionally solidified eutectics evaluated for the intermetallic NiAl–9Mo

Cited by 27 publications

References 40 publications

Validation of the applicability of a creep model for directionally solidified eutectics with a lamellar microstructure

Validation of the applicability of a creep model for directionally solidified eutectics with a lamellar microstructure

A Novel Method for Preparing Intermetallics/Superalloy Dissimilar Materials Using Current Sintering of Metallic Powders

The Creep‐Induced Micro‐ and Nanostructural Evolution of a Eutectic Mo–Si–Ti Alloy at 1200 °C

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