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Creep behaviour of two-phase lamellar TiAl: Crystal plasticity modelling and analysis

Ilyas, Muhammad Umer and Kabir, Mohammad Rizviul (2021) Creep behaviour of two-phase lamellar TiAl: Crystal plasticity modelling and analysis. Intermetallics, 132. Elsevier. doi: 10.1016/j.intermet.2021.107129. ISSN 0966-9795.

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Abstract

Two-phase (α2Ti3Al+γTiAl) fully lamellar TiAl alloys show highly anisotropic creep behaviour. Depending on lamellar orientations, locally in the TiAl phases hard and easy deformation modes are active, which significantly influence the creep behaviour at a global scale. To obtain comprehensive understanding how the locally activated crystallographic deformation modes influence the macroscopic creep behaviour, a crystal plasticity (CP) model with modified hardening behaviour is proposed in this work. For this purpose, a softening parameter is introduced in the model that phenomenologically describes the threshold stresses for material softening depending on pile-up dislocation lengths during creep deformation. The model allows us to interpret the cause of creep anisotropy at macro-scale deformation based on the orientation dependent activation and interactions of slip systems at the TiAl phases. Comprehensive study was performed to validate the model and to predict creep parameters under different temperature and stress loading conditions. Comparing the experimental data with simulation results, we found that the proposed CP model captures creep behaviour in primary, secondary, and tertiary regime for all the lamellar orientations with good accuracy. This model can be further used for investigating microstructure-sensitive creep behaviour of a wide range of TiAl alloys

Item URL in elib:https://elib.dlr.de/147395/
Document Type:Article
Title:Creep behaviour of two-phase lamellar TiAl: Crystal plasticity modelling and analysis
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Ilyas, Muhammad UmerUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kabir, Mohammad RizviulUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:1 January 2021
Journal or Publication Title:Intermetallics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:132
DOI:10.1016/j.intermet.2021.107129
Publisher:Elsevier
ISSN:0966-9795
Status:Published
Keywords:Crystal plasticityCreep anisotropyLamellar TiAl alloyFinite element modelling
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Advanced Materials and New Manufacturing Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Kabir, Dr. -Ing Mohammad Rizviul
Deposited On:27 Jan 2022 12:23
Last Modified:31 Mar 2023 03:00

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