Journal ArticleDOI
Superplastic deformation of sheet test pieces machined from Ti-6Al-4V bar
TLDR
In this article, a set of contiguous alpha grains aligned in the rolling direction caused local variations in the flow stress, strain to necking, strain rate sensitivity, plastic strain ratio values and surface roughness.Abstract:
Sheet tensile test pieces were machined in three orientations from edge textured Ti-6Al-4V bar and tested at temperatures in the range 800 to 975‡ C and at strain rates of 3 × 10−4 and 1.5×10−3 sec−1. Bands of contiguous alpha grains aligned in the rolling direction caused local variations in the flow stress, strain to necking, strain rate sensitivity, plastic strain ratio values and surface roughness. Texture effects were only detected at the lowest test temperature (800‡C) and highest strain rate (1.5×10−3 sec−1).read more
Citations
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Journal ArticleDOI
A study on diffusion bonding of superplastic Ti-6Al-4V ELI grade
TL;DR: In this article, a series of tensile tests was carried out at the strain rate range of 10 −4 to 10 −2 ǫ s −1 and temperature range of 0.73 −1223 K and the maximum elongation of 1898% was obtained at the stretch ratio of 1 −3 −1 at 850 −°C.
Journal ArticleDOI
Effect of texture and mechanical anisotropy on flow behaviour in Ti–6Al–4V alloy under superplastic forming conditions
TL;DR: In this paper, the dependency of anisotropic flow behaviour on crystallographic texture was investigated in Ti-6Al-4V alloy at 750 and 900°C under constant strain rates of 10−2, 10−3 and 2
Journal ArticleDOI
High-temperature deformation and failure of an orthorhombic titanium aluminide sheet material
P. D. Nicolaou,S. L. Semiatin +1 more
TL;DR: In this article, the high-temperature deformation and failure behavior of an orthorhombic titanium aluminide sheet alloy (fabricated by diffusion bonding of six thin foils) was established by conducting uniaxial tension and plane-strain compression tests at 980 °C and strain rates between 10−4 and 10−2 s−1.
Journal ArticleDOI
Microstructural evolution during superplastic bulge forming of Ti–6Al–4V alloy
TL;DR: In this paper, an analytical model reflecting the microstructural evolution was made on the basis of Dutta and Mukherjee's work, and applied to the superplastic bulge forming of Ti-6Al-4V alloy.
Journal ArticleDOI
An orthotropic flow rule for superplastic Ti-6A1-4V
Daniel A. Mosher,Paul R. Dawson +1 more
TL;DR: In this article, the relationship between macroscopic anisotropy and the microstructure was modeled by assuming that the lateral flow during uniaxial tests depends on the α phase grain shape in the lateral plane but is independent of the directional grain size parallel to the axis of deformation.
References
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Journal ArticleDOI
Diffusion-accommodated flow and superplasticity
M.F. Ashby,R. A. Verrall +1 more
TL;DR: In this article, a new mechanism for superplastic deformation is described and modelled, which differs fundamentally from Nabarro-Herring and Coble creep in a topological sense: grains switch their neighbors and do not elongate significantly.
Journal ArticleDOI
Grain-boundary sliding and its accommodation during creep and superplasticity
TL;DR: In this paper, the roles of grain-boundary sliding (GBS) and of other creep mechanisms in creep and fine-grain superplasticity are presented in relation to a model based on the division of grains into their central cores and peripheral “mantles.
Journal ArticleDOI
An investigation of intercrystalline and interphase boundary sliding in the superplastic Pb-62% Sn eutectic
TL;DR: In this paper, boundary sliding in the superplastic Pb-62% Sn eutectic alloy was investigated and it was shown that the contribution from sliding is high in the region II ( ϵ gbs ϵ t − 50 − 60%), where ϵgbs is the strain due to sliding and ϵl is the total strain.
Journal ArticleDOI
An evaluation of the roles of intercrystalline and interphase boundary sliding in two-phase superplastic alloys
TL;DR: In this paper, the authors measured the contribution of boundary sliding in the superplastic Zn-22% Al eutectoid alloy at an elongation of 100% and showed that the sliding contribution is a maximum in the region II and a decrease in the less region I and III.
Journal ArticleDOI
A deformation model for anisotropic superplasticity in two phase alloys
TL;DR: In this article, a model based on sliding resistance at α/α, α/β and ββ grain boundaries was proposed to explain the anisotropic behavior of Ti-6Al-4V alloys.
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