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Influence of microstructural heterogeneity on the micro-meso deformation of a two-phase TiAl alloy investigated by nanoindentation and a numerical two scale model

Kabir, Mohammad Rizviul and Chernova, Liudmila and Zotov, Nikolay and Bartsch, M. (2009) Influence of microstructural heterogeneity on the micro-meso deformation of a two-phase TiAl alloy investigated by nanoindentation and a numerical two scale model. EUROMAT 2009, 7-10. Sept. 2009, Glasgow, UK.

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Abstract

Micro and meso scale deformation behavior of a (a2+g) TiAl alloy has been investigated by multiscale modeling and nanoindentation testing using Berkovich indenter. A duplex microstructure, which consists of globular grains of g-TiAl phase and lamellar colonies of (a2Ti3Al + gTiAl) phases, has been examined. The micro-meso length scales are coupled in a previously validated FE2 multiscale approach. The constitutive behavior of the phases is described in a crystal plasticity model. The FE2 model is adjusted to capture important microstructural information, such as, volume percentage of the phases, orientation, lamellae thickness, etc. on a micro scale, and the size of grains/colonies as well as their distribution on a meso scale. The deformation behavior of the individual grains and colonies are examined by nanoindentation testing and correlated with the local microstructural heterogeneities. By means of simulations it will be shown that the model can predict the microstructure-dependent alloy response as seen from the nanoindentation testing. Furthermore, results will be shown that explain the anisotropic dependency of the yield, contribution of the dislocation-slips of the phases on the mesoscopic deformation of grains/colonies, and the influence of the microstructural heterogeneities on the local plastic strain accumulation.

Item URL in elib:https://elib.dlr.de/61328/
Document Type:Conference or Workshop Item (Speech)
Title:Influence of microstructural heterogeneity on the micro-meso deformation of a two-phase TiAl alloy investigated by nanoindentation and a numerical two scale model
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kabir, Mohammad RizviulWF, DLRUNSPECIFIED
Chernova, LiudmilaWF, DLRUNSPECIFIED
Zotov, NikolayRuhr-Universität BochumUNSPECIFIED
Bartsch, M.WF, DLRUNSPECIFIED
Date:7 September 2009
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:TiAl, Modeling, nanoindentation
Event Title:EUROMAT 2009
Event Location:Glasgow, UK
Event Type:international Conference
Event Dates:7-10. Sept. 2009
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Low-Emission Air Traffic (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Kabir, Dr. -Ing Mohammad Rizviul
Deposited On:02 Dec 2009 16:31
Last Modified:15 Jan 2010 02:18

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