Modelling of the ductile damage behaviour of a beta solidifying gamma titanium aluminide alloy during hot-working

Dilek Halici, Daniel Prodinger, Maria Cecilia Poletti, Daniel Huber, Martin Stockinger, Christof Sommitsch

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Abstract

The hot workability of intermetallic titanium aluminide alloys can be limited by ductile failure. Titanium aluminides undergo microstructural changes during hot deformation processes, including flow instabilities such as shear bands, flow localization, void formation and growth. In this work, the ductile damage behaviour of a gamma titanium aluminide alloy with a nominal composition of Ti-43.5Al-4Nb-1Mo-0.1B (in at. %) termed TNM, was studied by means of damage modelling implemented in finite element method simulations. The flow localization or α parameter was calculated based on flow softening due to flow instabilities in the material. Predictions by the α instability criteria were compared with traditional models such as Cockcroft & Latham, normalized Cockcroft & Latham, Brozzo and Ayada. Predictions of these instability and damage parameters were validated by hot compression experiments carried out on a Gleeble®3800 simulator. Hot deformation experiments of the TNM alloy were conducted in a wide range of temperatures and strain rates up to a strain of 0.9. Metallography was carried out on deformed specimens using light optical microscopy and scanning electron microscopy to determine damage and flow localization. Deformation at high strain rates was characterized by instabilities due to adiabatic flow such as shear bands and cracks.

Original languageEnglish
Title of host publicationAdvanced Materials Research
PublisherTrans Tech Publications Ltd.
Pages556-561
Number of pages6
Volume783-786
ISBN (Print)9783038350736
DOIs
Publication statusPublished - 2014
Event8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013 - Las Vegas, NV, United States
Duration: 2 Dec 20136 Dec 2013

Publication series

NameMaterials Science Forum
Volume783-786
ISSN (Print)02555476

Conference

Conference8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013
Abbreviated titleTHERMEC 2013
CountryUnited States
CityLas Vegas, NV
Period2/12/136/12/13

Keywords

  • Ductile damage
  • FEM
  • Gamma titanium aluminide
  • Hot deformation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

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  • Cite this

    Halici, D., Prodinger, D., Poletti, M. C., Huber, D., Stockinger, M., & Sommitsch, C. (2014). Modelling of the ductile damage behaviour of a beta solidifying gamma titanium aluminide alloy during hot-working. In Advanced Materials Research (Vol. 783-786, pp. 556-561). (Materials Science Forum; Vol. 783-786). Trans Tech Publications Ltd.. https://doi.org/10.4028/www.scientific.net/MSF.783-786.556