Abstract
Achieving superior superplastic properties in fine grained intermetallic alloys based on γ-TiAl + α2‑Ti3Al
Highlights
IntroductionIt is 30 years since the first paper devoted to superplasticity of intermetallic alloys based on γ-TiAl + α2‐Ti3Al (hereafter γ + α2 alloys) was issued [1]
It is 30 years since the first paper devoted to superplasticity of intermetallic alloys based on γ-TiAl + α2‐Ti3Al was issued [1]
The present paper is a brief review of superplastic behavior of γ + α2 alloys with varying niobium content and refined microstructure obtained by hot working [19, 36, 37]
Summary
It is 30 years since the first paper devoted to superplasticity of intermetallic alloys based on γ-TiAl + α2‐Ti3Al (hereafter γ + α2 alloys) was issued [1]. In γ + α2 alloys have been recently reached for the alloy with a low content of the α2 phase and free of the β (B2) phase [36] and for the alloy with partially recrystallized microstructure containing 40 % of lamellae remnants and near free of the β (B2) phase [37]. It seems that there is non-obvious reason, which is more important for achieving superior superplastic properties in intermetallic γ + α2 alloys. Theoretical models based on grain boundary sliding accommodated by dislocation glide and climb lead to a well known relationship [38]:
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