Mechanisms of Superplasticity in Titanium Alloys: Measurement, In Situ Observations and Rationalization

Enrique Alabort; Daniel Barba; Roger Reed

doi:10.4028/www.scientific.net/DDF.385.65

Paper Titles

Superplasticity of Aerospace 7075 (Al-Zn-Mg-Cu) Aluminium Alloy Obtained by Severe Plastic Deformation
p.39

Arrhenius-Type Constitutive Equation Model of Superplastic Deformation Behaviour of Different Titanium Based Alloys
p.45

Effect of Ultrasonic Treatment on the Characteristics of Superplasticity of Titanium Alloy Ti-6Al-4V
p.53

Low Temperature Superplasticity in Ultrafine-Grained AZ31 Alloy
p.59

Mechanisms of Superplasticity in Titanium Alloys: Measurement, In Situ Observations and Rationalization
p.65

Room Temperature Superplasticity in Fine/Ultrafine-Grained Zn-Al Alloys with Different Phase Compositions
p.72

On Dynamic Superplasticity of Aluminum Alloys with Initial Varying Grain Size Structure
p.78

Effect of Homogenization Treatment on Superplastic Properties of Aluminum Based Alloy with Minor Zr and Sc Additions
p.84

Tensile Properties of AZX612 Magnesium Alloy Sheets Processed by Friction-Assisted Extrusion
p.91

HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 385Mechanisms of Superplasticity in Titanium Alloys:...

Mechanisms of Superplasticity in Titanium Alloys: Measurement, In Situ Observations and Rationalization

Abstract:

Surface observations are used to elucidate the deformation mechanisms responsible forsuperplasticity in the Ti-6Al-4V and Ti-4Al-2.5V-1.5Fe titanium alloys. First, stress relaxation testsare used to quantify the difference in superplastic behaviour of each alloy. Then, high-temperature insitutensile tests are performed in the scanning electron microscope at 700, 800, and 900°C to relatedifferences in formability to micro-mechanisms. These are found highly dependent on: (i) the grainsize; (ii) the alpha-to-beta volume fraction; (iii) the crystallographic texture; and (iv) the nature and angle ofthe dominant grain boundaries.