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Influence of Impact on the Mechanical Behaviour of the Gamma-Based TiAl Alloy TNBV3B

Gebhard, Susanne and Peters, Petrus and Roth-Fagaraseanu, Dan and Voggenreiter, Heinz (2011) Influence of Impact on the Mechanical Behaviour of the Gamma-Based TiAl Alloy TNBV3B. Advanced Engineering Materials, 13. WILEY-VCH Verlag Gmbh & Co. KGaA. DOI: 10.1002/adem.201100042. (In Press)

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The quasi-static and fatigue behavior after impact of the TiAl alloy TNBV3B produced via three different processing routes—cast, forged and extruded—has been studied on flat and airfoil-like shaped specimens making use of ballistic impact experiments. For impacts resulting in cracks the behaviour can be described using a linear-elastic fracture mechanics approach. The residual strength is described on the basis of the fracture toughness. The residual fatigue strength of impact-cracked specimens is estimated on the basis of the threshold for crack growth of the TNBV3B alloys. However, when there is no visible crack or when the crack length is below the size of the deformed impact area, residual stresses and micro-damage play a dominating role making the linear-elastic fracture mechanics approach invalid. The deformation hardened zone in TiAl has been studied making use of micro-hardness tests showing their extension and the degrees of deformation for different impact energies.

Document Type:Article
Title:Influence of Impact on the Mechanical Behaviour of the Gamma-Based TiAl Alloy TNBV3B
AuthorsInstitution or Email of Authors
Gebhard, SusanneRolls-Royce Deutschland
Roth-Fagaraseanu, DanRolls-Royce Deutschland
Voggenreiter, HeinzUNSPECIFIED
Journal or Publication Title:Advanced Engineering Materials
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Publisher:WILEY-VCH Verlag Gmbh & Co. KGaA
Status:In Press
Keywords:Impact, Mechanical Behaviour, Titanium, Fracture Mechanics, Alloy, Ballistic
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Fan and Compressor Technologies
Location: Köln-Porz , Stuttgart
Institutes and Institutions:Institute of Materials Research > Light Metal Composites
Deposited By: Karin Obimezie
Deposited On:19 Oct 2011 15:32
Last Modified:26 Mar 2013 13:31

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