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Accessing Colony Boundary Strengthening of Fully Lamellar TiAl Alloys via Micromechanical Modeling

In this article, we present a strategy to decouple the relative influences of colony, domain and lamella boundary strengthening in fully lamellar titanium aluminide alloys, using a physics-based crystal plasticity modeling strategy. While lamella and domain boundary strengthening can be isolated in...

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Autores principales: Schnabel, Jan Eike, Bargmann, Swantje
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5578262/
https://www.ncbi.nlm.nih.gov/pubmed/28771218
http://dx.doi.org/10.3390/ma10080896
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author Schnabel, Jan Eike
Bargmann, Swantje
author_facet Schnabel, Jan Eike
Bargmann, Swantje
author_sort Schnabel, Jan Eike
collection PubMed
description In this article, we present a strategy to decouple the relative influences of colony, domain and lamella boundary strengthening in fully lamellar titanium aluminide alloys, using a physics-based crystal plasticity modeling strategy. While lamella and domain boundary strengthening can be isolated in experiments using polysynthetically twinned crystals or mircomechanical testing, colony boundary strengthening can only be investigated in specimens in which all three strengthening mechanisms act simultaneously. Thus, isolating the colony boundary strengthening Hall–Petch coefficient [Formula: see text] experimentally requires a sufficient number of specimens with different colony sizes [Formula: see text] but constant lamella thickness [Formula: see text] and domain size [Formula: see text] , difficult to produce even with sophisticated alloying techniques. The here presented crystal plasticity model enables identification of the colony boundary strengthening coefficient [Formula: see text] as a function of lamella thickness [Formula: see text]. The constitutive description is based on the model of a polysynthetically twinned crystal which is adopted to a representative volume element of a fully lamellar microstructure. In order to capture the micro yield and subsequent micro hardening in weakly oriented colonies prior to macroscopic yield, the hardening relations of the adopted model are revised and calibrated against experiments with polysynthetically twinned crystals for plastic strains up to 15%.
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spelling pubmed-55782622017-09-05 Accessing Colony Boundary Strengthening of Fully Lamellar TiAl Alloys via Micromechanical Modeling Schnabel, Jan Eike Bargmann, Swantje Materials (Basel) Article In this article, we present a strategy to decouple the relative influences of colony, domain and lamella boundary strengthening in fully lamellar titanium aluminide alloys, using a physics-based crystal plasticity modeling strategy. While lamella and domain boundary strengthening can be isolated in experiments using polysynthetically twinned crystals or mircomechanical testing, colony boundary strengthening can only be investigated in specimens in which all three strengthening mechanisms act simultaneously. Thus, isolating the colony boundary strengthening Hall–Petch coefficient [Formula: see text] experimentally requires a sufficient number of specimens with different colony sizes [Formula: see text] but constant lamella thickness [Formula: see text] and domain size [Formula: see text] , difficult to produce even with sophisticated alloying techniques. The here presented crystal plasticity model enables identification of the colony boundary strengthening coefficient [Formula: see text] as a function of lamella thickness [Formula: see text]. The constitutive description is based on the model of a polysynthetically twinned crystal which is adopted to a representative volume element of a fully lamellar microstructure. In order to capture the micro yield and subsequent micro hardening in weakly oriented colonies prior to macroscopic yield, the hardening relations of the adopted model are revised and calibrated against experiments with polysynthetically twinned crystals for plastic strains up to 15%. MDPI 2017-08-03 /pmc/articles/PMC5578262/ /pubmed/28771218 http://dx.doi.org/10.3390/ma10080896 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Schnabel, Jan Eike
Bargmann, Swantje
Accessing Colony Boundary Strengthening of Fully Lamellar TiAl Alloys via Micromechanical Modeling
title Accessing Colony Boundary Strengthening of Fully Lamellar TiAl Alloys via Micromechanical Modeling
title_full Accessing Colony Boundary Strengthening of Fully Lamellar TiAl Alloys via Micromechanical Modeling
title_fullStr Accessing Colony Boundary Strengthening of Fully Lamellar TiAl Alloys via Micromechanical Modeling
title_full_unstemmed Accessing Colony Boundary Strengthening of Fully Lamellar TiAl Alloys via Micromechanical Modeling
title_short Accessing Colony Boundary Strengthening of Fully Lamellar TiAl Alloys via Micromechanical Modeling
title_sort accessing colony boundary strengthening of fully lamellar tial alloys via micromechanical modeling
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5578262/
https://www.ncbi.nlm.nih.gov/pubmed/28771218
http://dx.doi.org/10.3390/ma10080896
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