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Use of spherical indentation technique for measurement of property variations of gamma-TiAl

Cornec, Alfred and Kabir, Mohammad Rizviul and Huber, Nobert (2012) Use of spherical indentation technique for measurement of property variations of gamma-TiAl. Journal of Materials Research, 27, pp. 378-388. Cambridge University Press. DOI: 10.1557/jmr.2011.366

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Abstract

Novel lightweight intermetallic titanium aluminides, so-called gamma-TiAl, provide good strength and creep resistance up to 700 °C. Their stress–strain behavior at room temperature is however strongly confined in elongation due to their low ductility. For studying the stress–strain behavior of gamma-TiAl, the viscoplastic mechanical properties are determined using spherical indentation testing. The identification problem is solved on the continuum level by neural network analysis, which is based on a unified viscoplasticity model. The identified material parameters are validated by comparing the predicted stress–strain behavior with conventional compression tests at different deformation velocities. It was found that the average response of the indentation tests is in good agreement with the compression tests of round bars. Using a spherical indenter tip of R=0.2 mm, a small volume is tested, offering possibilities for investigation of local property variations due to processing. The experimental indentation curves exhibited wide hysteresis loops, revealing the existence of pure kinematic hardening. Since tensile fracture strength for gamma-TiAl is very low, microcracking occurred during loading as well as during unloading, significantly contributing to the unloading compliance.

Item URL in elib:https://elib.dlr.de/78587/
Document Type:Article
Title:Use of spherical indentation technique for measurement of property variations of gamma-TiAl
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Cornec, AlfredMaterials Mechanics, Institute of Materials Research, Helmholtz-Zentrum Geesthacht, GeesthachtUNSPECIFIED
Kabir, Mohammad RizviulInstitute of Materials Research, German Aerospace Center (DLR), 51147 Köln, GermanyUNSPECIFIED
Huber, NobertMaterials Mechanics, Institute of Materials Research, Helmholtz-Zentrum Geesthacht, GeesthachtUNSPECIFIED
Date:2012
Journal or Publication Title:Journal of Materials Research
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:27
DOI :10.1557/jmr.2011.366
Page Range:pp. 378-388
Publisher:Cambridge University Press
Status:Published
Keywords:gamma-TiAl, indentation, property, modelling
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:16 Nov 2012 09:02
Last Modified:06 Sep 2019 15:16

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