Thermal Expansion of a Multiphase Intermetallic Ti-Al-Nb-Mo Alloy Studied by High-Energy X-ray Diffraction

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Authors

External Organisational units

  • Institute of Materials Research, Helmholtz-Zentrum Geesthacht

Abstract

Intermetallic γ-TiAl-based alloys are lightweight materials for high-temperature applica-tions, e.g., in the aerospace and automotive industries. They can replace much heavier Ni-based alloys at operating temperatures up to 750 C. Advanced variants of this alloy class enable processing routes that include hot forming. These alloys consist of three relevant crystallographic phases (γ-TiAl, α 2-Ti 3Al, β o-TiAl) that transform into each other at different temperatures. For thermo-mechanical treatments as well as for adjusting alloy properties required under service conditions, the knowledge of the thermal expansion behavior of these phases is important. Therefore, thermal expansion co-efficients were determined for the relevant phases in a Ti-Al-Nb-Mo alloy for temperatures up to 1100 C using high-energy X-ray diffraction.

Details

Original languageEnglish
Article number727
Pages (from-to)1-13
Number of pages13
JournalMaterials
Volume14.2021
Issue number4
DOIs
Publication statusPublished - 4 Feb 2021