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Numerical investigation of room temperature deformation behavior of a duplex type gTiAl alloy using a multi-scale modeling approach

Kabir, M. Rizviul and Chernova, Liudmila and Bartsch, Marion (2010) Numerical investigation of room temperature deformation behavior of a duplex type gTiAl alloy using a multi-scale modeling approach. Acta Materialia, 58, pp. 5834-5847. Elsevier.

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Abstract

Room-temperature deformation of a niobium-rich TiAl alloy with duplex microstructure has been numerically investigated. The model links the microstructural features at micro- and meso-scale by the two-level (FE2) multi-scale approach. The deformation mechanisms of the considered phases were described in the micro-mechanical crystal-plasticity model. Initial material parameters for the model were taken from the literature and validated using tensile experiments at macro-scale. For the niobium-rich TiAl alloy further adaptation of the crystal plasticity parameters is proposed. Based on these model parameters, the influences of the grain orientation, grain size, and texture on the global mechanical behavior have been investigated. The contributions of crystal deformation modes (slips and dislocations in the phases) to the mechanical response are also analyzed. The results enable a quantitative prediction of relationships between microstructure and mechanical behavior on global and local scale, including an assessment of possible crack initiation sites. The model can be used for microstructure optimization to obtain better material properties.

Item URL in elib:https://elib.dlr.de/66329/
Document Type:Article
Title:Numerical investigation of room temperature deformation behavior of a duplex type gTiAl alloy using a multi-scale modeling approach
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kabir, M. RizviulInstitute of Materials ResearchUNSPECIFIED
Chernova, LiudmilaInstitute of Materials ResearchUNSPECIFIED
Bartsch, MarionInstitute of Materials ResearchUNSPECIFIED
Date:30 July 2010
Journal or Publication Title:Acta Materialia
Refereed publication:Yes
Open Access:No
In DOAJ:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:58
Page Range:pp. 5834-5847
Publisher:Elsevier
Status:Published
Keywords:Micro-mechanical modeling; Titanium aluminide; Mechanical properties; Duplex microstructure; Multi-scale model
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation Methods (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Kabir, Dr. -Ing Mohammad Rizviul
Deposited On:18 Nov 2010 17:48
Last Modified:10 Jan 2019 15:45

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