Constitutive Modeling of Low-Temperature Superplastic Flow of Ultrafine Ti-6Al-4V Sheet Material

S. Lee Semiatin; Gordon A. Sargent

doi:10.4028/www.scientific.net/KEM.433.235

Paper Titles

High-Temperature Forming of a Vehicle Closure Component in Fine-Grained Aluminum Alloy AA5083: Finite Element Simulations and Experiments
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New Developments in Superplastic Forming Simulation and Industrial Applications
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Finite Element Simulation on Superplastic Forming of Outer Jacket of Combustion Chamber
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The Role of the Numerical Simulation in Superplastic Forming Process Analysis and Optimization
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Constitutive Modeling of Low-Temperature Superplastic Flow of Ultrafine Ti-6Al-4V Sheet Material
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Superplasticity in Friction Stir Processed AZ80 Magnesium Alloy
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Finite Element Modelling and Experimental Testing of Thermomechanical Behaviour and Failure of Titanium Superplastic Forming Dies
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An Overview of Hot- and Warm-Forming of Al-Mg Alloys
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Large Deformability of Wrought Magnesium Alloys: Is Superplasticity Needed?
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Constitutive Modeling of Low-Temperature Superplastic Flow of Ultrafine Ti-6Al-4V Sheet Material

Abstract:

The low-temperature superplastic flow behavior of two lots of Ti-6Al-4V sheet with an ultrafine microstructure was modeled. One lot (Sheet A) had an equiaxed-alpha starting microstructure; the flow stress/flow hardening exhibited by this material was explained on the basis of the Bird-Mukherjee-Dorn constitutive equation. The other material (Sheet B), having a mixed equiaxed- and remnant-lamellar alpha microstructure, underwent flow softening, flow hardening, or steady-state flow depending on test temperature and strain rate. These behaviors were interpreted in the context of a dynamic spheroidization model. The apparent flow softening at the end of all of the flow curves was explained using a simple flow-localization model.

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Periodical:

Key Engineering Materials (Volume 433)

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235-240

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.433.235

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Online since:

March 2010

Authors:

S. Lee Semiatin, Gordon A. Sargent

Keywords:

Constitutive Behaviour, Dynamic Spheroidization, Flow Hardening, Flow-Localization Analysis, Low Temperature Superplasticity

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