Superplastic properties of γ+α2 titanium aluminide alloy Ti-43Al-(Nb,Mo,B) in cast + post-solidification heat treated condition

V.M. Imayev, R.M. Imayev, T.G. Khismatullin, G.A. Salishchev

Research output: Contribution to journalConference Contribution

Abstract

A novel approach to fabrication of globularized fine-grained structure in γ+α2 titanium aluminide alloys has been proposed. The approach included the use of a specially designed alloy Ti-43 Al-X(Nb,Mo,B) and heat treatment. It was found that the ingot structure of the alloy might be partially globularized on a scale of bulk material using only globularization anneal excluding any hot working procedure. The microstructure and tensile mechanical properties of the alloy in the cast + heat treated condition were investigated. The tensile mechanical tests were performed in air in the temperature range of T=900-1130°C at an initial strain rate of ε'=1.7×10-4 s-1. High elongation (δ= 160-230%) and low flow stresses (σ=36-100 MPa) typical of superplastic behavior were measured at T=1050-1130°C It was demonstrated that the sheet material produced by spark cutting of the cast + heat treated alloy might be successfully hot formed.

Original languageEnglish
Pages (from-to)447-452
Number of pages6
JournalMaterials Science Forum
Volume551-552
DOIs
Publication statusPublished - 2007
Externally publishedYes
Event9th International Conference on Superplasticity in Advanced Materials, ICSAM 2006 - Chengdu, China
Duration: 23 Jun 200626 Jun 2006

Keywords

  • heat treatment
  • microstructure
  • superplasticity
  • tensile mechanical properties
  • titanium alumlnides

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