Special Issue "Superplasticity and Superplastic Forming"

Guest Editor
Dr. Wei Sun
Department of Mechanical, Materials and Manufacturing Engineerin, University of Nottingham, Nottingham NG7 2RD, UK
Website: http://www.nottingham.ac.uk/Engineering/Departments/M3/People/w.sun
E-Mail:
Phone: 0115 951 3809
Fax: 0115 951 3800

Guest Editor
Prof. Dr. Thomas H. Hyde
Department of Mechanical, Materials and Manufacturing Engineering, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, UK
Website: http://www.nottingham.ac.uk/Engineering/People/thomas.hyde
E-Mail:
Phone: +44 115 9513830
Fax: +44 115 9513800

Submission

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Title: Superplasticity: Mechanical Characteristics, Origin, Dislocation Activity, and Utilization
Author: Farghalli A. Mohamed
Affiliation: Department of Chemical Engineering and Materials Science, University of California, Irvine, CA 92697-2575, USA; E-Mail: famohame@uci.edu
Abstract: Micrograin Superplasticity refers to the ability of fine-grained materials (1μm < d < 10 μm, where d is the grain size) to exhibit extensive neck-free elongations during deformation at elevated temperatures. Over the past three decades, good progress has been made in rationalizing this phenomenon. The present paper provides a brief review on this progress in several areas that are related to: (a) the mechanical characteristics and origin of micrograin superplasticity, (b) dislocation activities and role during superplastic flow and (c) the utilization of superplasticity.

Title: Boronizing and Carbrizing Treatments on Superplastic Stainless and Titanium Based Alloy
Author: Masafumi Matsushita
Affiliation: Department of Mechanical Engineering, Ehime University, Bunkyo-cho, Matsuyama, 790-8577, Japan;
E-Mail: matsushita.masafumi.me@ehime-u.ac.jp
Abstract: Activated diffusion phenomenon of superplastic material can be used not only superplastic diffusion bonding, but also the surface hardening treatments, such as boronising and carburiging. The present paper provides a review and new experimental data of boronising and carburizing treatment on micro grain superplastic duplex stainless and titanium based alloy. Above the superplastic temperature, the diffusion activates, further an increase in the temperature, texture variation occurs. The diffused boron and carbon reacts to some kind of component elements of super plastic materials. Some kind of reacted material is stable and making hard surface.

Title: Constitutive Modelling of Al-5083 Superplastic Aluminium Alloy with Cavitation Effects
Authors: N. Otegi ¹, L. Galdos ¹, I. Hurtado ¹ and S.B. Leen ²
Affiliations: ¹ Mechanical and Manufacturing Department, Mondragon University, Loramendi, 4 20500 Arrasate – Mondragon, Spain
² Mechanical and Biomedical Engineering, NUI Galway, Ireland
Abstract: This paper describes the development of a constitutive equation set which includes the effects of cavitation-induced softening for a commercial Al-5083 superplastic aluminium alloy. The constitutive formulation adopted is a hyperbolic, mechanisms-based constitutive equation set. The development of an algorithm for multi-stage identification of the complex set of constitutive parameters is presented and this approach is applied to characterise the constitutive behaviour of the Al-5083 at 500 oC, based on constant strain-rate tensile test data. A large deformation, multiaxial formulation of the constitutive equation set is implemented and applied to finite element modelling of a bulge test forming process to characterise the cavitation evolution behaviour in the bulge test for different back pressure conditions.