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Grain Boundary Development in Superplastic Aluminum Alloys

1996-12-01
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Release : 1996-12-01
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Kind : eBook
Book Rating : 730/5 ( reviews)

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Book Synopsis Grain Boundary Development in Superplastic Aluminum Alloys by : Michael Edward McMahon

Download or read book Grain Boundary Development in Superplastic Aluminum Alloys written by Michael Edward McMahon. This book was released on 1996-12-01. Available in PDF, EPUB and Kindle. Book excerpt: Superplasticity may be defined as the capability of certain polycrystalline materials to deform to extensive plastic elongations prior to failure, often without formation of a neck. Typically, superplasticity refers to tensile elongations greater than 200%, although some elongations have been reported in excess of 5000% Ref 1. While it has been suggested that bronze metals in use in ancient civilizations may have possessed superplastic properties Ref 2, most historical reviews credit the modern-day documentation of superplastic behavior to a paper published in the Journal of the Institute of Metals by G.D. Bengough in 1912 which described extensive elongations in brass Ref 3. Recognition of a stress and strain-rate relationship was first presented qualitatively in a paper by Rosenhain in 1920 which examined a near eutectic Zn- Al-Cu alloy Ref 4. Photomicrographs detailing superplastic grain structures in eutectic Sn-Pb and Bi-Pb alloys deformed to elongations of 2000% were presented in 1934 by Pearson Ref 5. This study was the first to identify an equiaxed grain morphology in the deformed regions and suggest that grain boundary migration may be involved in the deformation processes.

Superplasticity of Alloys, Intermetallides and Ceramics

2012-12-06 Technology & Engineering
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Release : 2012-12-06
Genre : Technology & Engineering
Kind : eBook
Book Rating : 734/5 ( reviews)

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Book Synopsis Superplasticity of Alloys, Intermetallides and Ceramics by : Oscar A. Kaibyshev

Download or read book Superplasticity of Alloys, Intermetallides and Ceramics written by Oscar A. Kaibyshev. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Analysis of the Transition in Deformation Mechanisms in Superplastic 5083 Aluminum Alloys by Orientation Imaging Microscopy

2001-09-01
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Release : 2001-09-01
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Book Rating : 086/5 ( reviews)

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Book Synopsis Analysis of the Transition in Deformation Mechanisms in Superplastic 5083 Aluminum Alloys by Orientation Imaging Microscopy by : James W. Harrell

Download or read book Analysis of the Transition in Deformation Mechanisms in Superplastic 5083 Aluminum Alloys by Orientation Imaging Microscopy written by James W. Harrell. This book was released on 2001-09-01. Available in PDF, EPUB and Kindle. Book excerpt: Recently developed Orientation Imaging Microscopy (OIM) methods have been applied to the analysis of microstructure and microtexture of 5083 aluminum alloy materials that have been processed to enable superplasticity. The phenomenon of superplasticity allows economical forming of complex components while retaining the high strength- and stiffness-to-weight ratios characteristic of aluminum alloys used in automotive, aerospace and military applications. Superplasticity requires fine grains with high-angle boundaries and resistance to failure by cavitation. OIM permits grain-specific orientation determination and quantitative assessment of the grain-to-grain disorientation distribution as well as grain size measurement in materials. The current work offers significant new insights into the development and response of superplastic microstructures; in particular, OIM data may be employed to delineate the transition from slip to grain boundary sliding in superplastic 5083 materials.

Superplasticity and Superplastic Forming II

1995 Science
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Release : 1995
Genre : Science
Kind : eBook
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Book Synopsis Superplasticity and Superplastic Forming II by : Amit Kumar Ghosh

Download or read book Superplasticity and Superplastic Forming II written by Amit Kumar Ghosh. This book was released on 1995. Available in PDF, EPUB and Kindle. Book excerpt: The study of superplasticity and superplastic forming (SPF) has been increasing steadily over the past 15 years. This volume examines the current state of the technology with a focus on technological applications of superplastic forming and the mechanistic behaviour of superplastic materials.

Aluminum-Lithium Alloys

2013-09-20 Technology & Engineering
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Release : 2013-09-20
Genre : Technology & Engineering
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Book Rating : 469/5 ( reviews)

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Book Synopsis Aluminum-Lithium Alloys by : S. Balasivanandha Prabu

Download or read book Aluminum-Lithium Alloys written by S. Balasivanandha Prabu. This book was released on 2013-09-20. Available in PDF, EPUB and Kindle. Book excerpt: Since the late 1950s, lithium is being used as an alloying element in aluminum. Their excellent ductility, which allows superplastic forming, along with their ability to decrease the density, makes aluminum-lithium alloys a primary choice for many structural applications in aerospace industry. This chapter initially discusses the processes and mechanisms that give rise to significant plasticity/Superplasticity in these alloy systems. The superplastic behavior of Al-Li alloys and their applications in forming are then discussed. The thickness variation during superplastic forming strongly depends on the peak strain rate sensitivity index (m) of the material, and an increase in the m value reduces the thickness variation in the formed component. The factors that help increase the value of m are enumerated. Superplastic forming is carried out at temperatures ≥ 0.5 Tm (Tm is the absolute melting temperature), often closer to 0.7 − 0.8 Tm. Significant cavitation and grain growth are present at such high temperatures. This has ushered in low temperature superplastic forming by the production of ultra-fine grain sizes via dispersion strengthening and severe plastic deformation (SPD). The promise of superplastic forming of Al-Li alloys for the future and the factors including cost that limit the use of Al-Li alloys are also discussed.

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