Superplastic Behavior of B- and Gd-Containing β-Solidifying TiAl Based Alloy

Vitaliy Sokolovsky; Nikita Stepanov; Sergey Zherebtsov; Nadezhda Nochovnaya; Pavel Panin; Gennady Salishchev

doi:10.4028/www.scientific.net/DDF.385.131

Paper Titles

Superplastic Deformation Behavior of As-Received and Hydrogenated Ti₂AlNb Alloy
p.109

On Mechanisms of “Grain Boundary Sliding”, in Light of the Kaibyshev-Valiev Data on Two Limit “Non-Equilibrium” GB States in Deformed Metallic Materials
p.120

Continuous Dynamic Recrystallization in Dual-Phase Titanium Alloy in Superplasticity
p.126

Superplastic Behavior of B- and Gd-Containing β-Solidifying TiAl Based Alloy
p.131

Superplasticity in Fine Grain Ti-6Al-4V Alloy: Mechanical Behavior and Microstructural Evolution
p.137

Microstructure Evolution and Properties of Ti-6Al-4V Alloy Doped with Fe and Mo during Deformation at 800°C
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Low-Temperature Superplasticity of the Ni-Based EK61 Superalloy and Application of this Effect to Obtain Sound Solid Phase Joints
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Local Accommodation Processes of Superplastic Grain Boundary Sliding: Their Direct Observation in Two-Dimensional Grain Boundary Sliding
p.155

HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 385Superplastic Behavior of B- and Gd-Containing...

Superplastic Behavior of B- and Gd-Containing β-Solidifying TiAl Based Alloy

Abstract:

Mechanical behavior and microstructure evolution of the cast Ti-43.2Al-1.9V-1.1Nb-1.0Zr-0.2Gd-0.2B alloy were studied at temperatures from 1100 to 1250°С and strain rates in the range 0.001-1 s^-1. Following phase fields (α₂+γ), (α+γ), (α) and (α+β) during heating of alloy were revealed. Microstructure analysis after deformation and mechanical behavior allowed defining main processes of structure formation. Two temperature-strain rate conditions with pronounced superplastic behaviour were found: the first one corresponded to the (α₂+γ)-phase field (1100°C), where the microstructure had mainly a lamellar morphology, and the second was associated with the (α+β)-phase field (1250°C), in which the α-phase dominated. At T=1100°C and έ=0.05 s^-1 the maximum strain rate sensitivity m was of 0.40. At T=1250°C and έ=0.5 s^-1 the maximum strain rate sensitivity m was of 0.59. In the (α₂+γ)-phase field, superplastic behavior was associated with the transformation of the lamellar structure into globular one. In the (α+β)-phase field, it was due to the formation of a homogeneous refined microstructure during dynamic recrystallization. The relationship between coefficient m value and microstructure formed was discussed.

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Defect and Diffusion Forum (Volume 385)

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131-136

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.385.131

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July 2018

Authors:

Vitaliy Sokolovsky*, Nikita Stepanov, Sergey Zherebtsov, Nadezhda Nochovnaya, Pavel Panin, Gennady Salishchev

Keywords:

Boron, Dynamic Recrystallization, Microstructure Evolution, Phase Field, Rare-Earth Element, Superplasticity, β-Solidifying TiAl Based Alloy

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