Superplastic Behaviour of Selected Magnesium Alloys PDF Download
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Author: Zuzanka Trojanová
Publisher:
ISBN:
Category : Technology
Languages : en
Pages :
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Book Description
Superplastic materials exhibit anomalous plasticity, achieving strain until several thousand per century The phenomenon of plasticity is limited on special microstructure, temperatures and strain rates. Magnesium and magnesium alloys are known as materials with limited plasticity. This is due to their hexagonal structure of these materials. Finding the superplasticity conditions has a crucial importance for applications of magnesium alloys. In this chapter, we will deal with the superplastic behaviour of AZ91, QE22, AE42 and EZ33 magnesium alloys. Materials were prepared by various techniques: thermomechanical treatments, equal channel angular pressing, hot extrusion, rolling, friction stirring and high-pressure torsion. Strain rate sensitivity and elongation to fracture were estimated at various temperatures. Mechanisms of superplastic flow are discussed. Grain boundary sliding and diffusional processes were depicted as the main mechanisms responsible for high plasticity of these alloys. On the other hand, cavitation at elevated temperatures deteriorates the superplastic properties.
Author: Zuzanka Trojanová
Publisher:
ISBN:
Category : Technology
Languages : en
Pages :
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Book Description
Superplastic materials exhibit anomalous plasticity, achieving strain until several thousand per century The phenomenon of plasticity is limited on special microstructure, temperatures and strain rates. Magnesium and magnesium alloys are known as materials with limited plasticity. This is due to their hexagonal structure of these materials. Finding the superplasticity conditions has a crucial importance for applications of magnesium alloys. In this chapter, we will deal with the superplastic behaviour of AZ91, QE22, AE42 and EZ33 magnesium alloys. Materials were prepared by various techniques: thermomechanical treatments, equal channel angular pressing, hot extrusion, rolling, friction stirring and high-pressure torsion. Strain rate sensitivity and elongation to fracture were estimated at various temperatures. Mechanisms of superplastic flow are discussed. Grain boundary sliding and diffusional processes were depicted as the main mechanisms responsible for high plasticity of these alloys. On the other hand, cavitation at elevated temperatures deteriorates the superplastic properties.
Author: Milton M. Tilman
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 28
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Book Description
Author: Tomasz Tański
Publisher: BoD – Books on Demand
ISBN: 1789843758
Category : Technology & Engineering
Languages : en
Pages : 140
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Book Description
Classical magnesium alloys are a combination of aluminium, magnesium, manganese and zinc. Magnesium combined with lithium forms ultralight alloys that have many uses. Since it is a reasonable material, it offers great possibilities and is constantly tested at various angles of applications and properties. Magnesium, previously used for military purposes, seems to fit perfectly to the requirements of the currently prevailing technology. Low density with appropriate mechanical properties (strength, high operating temperature), good foundry properties (high castability and low shrinkage), vibration damping ability and cost-effectiveness of recycling seem to be an ideal response to market needs. All things considered, magnesium alloys are the perfect material used in various industries starting from the automotive industry, through sport, electronics up to the space industry and defence. This book is written by experts in various areas of magnesium science and technology. It gives a general idea of modern advancements in theory and practical purposes of magnesium alloys. The book reports fundamental aspects of corrosion types and details about magnesium alloys designed to work in elevated temperatures and superplastic behaviour. Fundamentals, broad experience, theory as well as complex technological aspects make this work helpful for engineers and scientists from all over the world.
Author: Oscar A. Kaibyshev
Publisher: Springer Science & Business Media
ISBN: 3642846734
Category : Technology & Engineering
Languages : en
Pages : 327
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Book Description
Superplasticity is shown to be a universal phenomenon in materials ranging from metals and intermetallics to ceramics. Superplastic deformation facilitates the production of materials with specifically chosen properties. This is illustrated using the examples of Mg-, Al-, and Ti-based commercial alloys, steels, and superalloys. Some of the strenghts of this book are: the broad range of materials studied, the reduction of scientific results to a form suitable for the practitioner, a profound physical analysis of the phenomenon, a new approach to superplastic treatment as a kind of strain-heat treatment, the presentation of new data on superplastic flow and on production techniques of micro- and submicrocrystalline structures.
Author: Milton M. Tilman
Publisher:
ISBN:
Category : Magnesium alloys
Languages : en
Pages : 40
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: T. G. Nieh
Publisher: Cambridge University Press
ISBN: 9780521561051
Category : Technology & Engineering
Languages : en
Pages : 288
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Book Description
This book describes advances in the field of superplasticity, the ability of certain materials to undergo very large tensile strains. This phenomenon has increasing commercial applications, but also presents a fascinating scientific challenge in attempts to understand the physical mechanisms that underpin it. The authors emphasize the materials aspects of superplasticity. Beginning with a brief history of the phenomenon, they describe the two major types of superplasticity-- fine-structure and internal-stress superplasticity-- and discuss their operative mechanisms. They also present microstructural factors controlling the ductility and fracture in superplastic materials. Observations of superplasticity in metals (including aluminum, magnesium, iron, titanium and nickel), ceramics (including monoliths and composites), intermetallics (including iron, nickel, and titanium base), and laminates are thoroughly described. This is a valuable text for graduate students and researchers in materials science and engineering.
Author: Ryan Cottam
Publisher: LAP Lambert Academic Publishing
ISBN: 9783838363684
Category : Magnesium alloys
Languages : en
Pages : 160
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Book Description
Magnesium alloys are the lightest of all engineering structural alloys and as such have the potential to reduce the weight of structures, particularly in automobiles. The lack of formability of these alloys limits their application particularly for automotive parts formed by drawing and forging. Superplastic deformation offers a change in the mechanism of deformation and has the potential to increase the formability of magnesium alloys. This book details the development of a thermo-mechanical treatment that yielded an elongation to failure of over 2000 percent for bulk ZK60 - the largest ever recorded. This was achieved by changing the mechanism of deformation from dislocation slip to grain boundary sliding. This book would interest people working in the field of magnesium alloy formability, equal channel angular extrusion and superplasticity research.
Author: Tomasz Tański
Publisher:
ISBN: 9781838817817
Category : Magnesium alloys
Languages : en
Pages : 0
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Book Description
Author: Milton M. Tilman
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
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Book Description
