Mechanical Properties and Microstructural Characteristics of an Al-Mg Alloy with Bimodal Grain Size at Room and Elevated Temperatures PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Mechanical Properties and Microstructural Characteristics of an Al-Mg Alloy with Bimodal Grain Size at Room and Elevated Temperatures PDF full book. Access full book title Mechanical Properties and Microstructural Characteristics of an Al-Mg Alloy with Bimodal Grain Size at Room and Elevated Temperatures by Andrew Magee. Download full books in PDF and EPUB format.
Author: Andrew Magee
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 75
Get Book Here
Book Description
The strength of aluminum alloy 5083 has been shown to be significantly improved when it is engineered to have a bimodal grain size consisting of coarse grains (CGs) embedded in an ultrafine grained (UFG) matrix. This study investigates how a variety of parameters including strain rate, temperature, specimen thickness, CG ratio, and anisotropy affect the mechanical properties of this material when tested in uniaxial tension. The material is fabricated through cryomilling, cold isostatic pressing, and extrusion. A full factorial experiment is designed and implemented to test these effects on the material. Post-test examination of the specimens with optical and electron microscopes is conducted in order to gain a deeper understanding of the material's fracture behavior. While the material shows greatly improved strength compared to conventional Al-Mg alloys at room temperature, its strength rapidly decreases with rising temperature such that by 473 K, it was observed to be weaker than conventional Al 5083 at the same temperature. Dynamic recovery was observed in high temperature tests and the amount of recovery was found to depend on the material's CG ratio. Strain rate sensitivity was observed in the material at all temperatures. Significant differences were observed both in the material's properties and its fracture surface when the specimens were loaded parallel or perpendicular to the extrusion direction. A constitutive model based on Joshi's model of plasticity was developed to describe the material's room temperature behavior.
Author: Andrew Magee
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 75
Get Book Here
Book Description
The strength of aluminum alloy 5083 has been shown to be significantly improved when it is engineered to have a bimodal grain size consisting of coarse grains (CGs) embedded in an ultrafine grained (UFG) matrix. This study investigates how a variety of parameters including strain rate, temperature, specimen thickness, CG ratio, and anisotropy affect the mechanical properties of this material when tested in uniaxial tension. The material is fabricated through cryomilling, cold isostatic pressing, and extrusion. A full factorial experiment is designed and implemented to test these effects on the material. Post-test examination of the specimens with optical and electron microscopes is conducted in order to gain a deeper understanding of the material's fracture behavior. While the material shows greatly improved strength compared to conventional Al-Mg alloys at room temperature, its strength rapidly decreases with rising temperature such that by 473 K, it was observed to be weaker than conventional Al 5083 at the same temperature. Dynamic recovery was observed in high temperature tests and the amount of recovery was found to depend on the material's CG ratio. Strain rate sensitivity was observed in the material at all temperatures. Significant differences were observed both in the material's properties and its fracture surface when the specimens were loaded parallel or perpendicular to the extrusion direction. A constitutive model based on Joshi's model of plasticity was developed to describe the material's room temperature behavior.
Author: Andrew C. Magee
Publisher:
ISBN:
Category :
Languages : en
Pages : 280
Get Book Here
Book Description
Author: Roger Nicol Carrick
Publisher:
ISBN:
Category :
Languages : en
Pages : 189
Get Book Here
Book Description
The microstructural evolution and mechanical properties at elevated temperatures of a recently fabricated fine-grained AA6xxx aluminium sheet were evaluated and compared to the commercially fabricated sheet of the same alloy in the T4P condition. The behaviour of the fine-grained and T4P sheets was compared at elevated temperatures between 350°C and 550°C, as well as room temperature. Static exposure to elevated temperatures revealed that the precipitate structure of the fine-grained material did not change extensively. The T4P material, however, underwent extensive growth of precipitates, including a large amount of grain boundary precipitation. At room temperature, the T4P material deformed at much higher stresses than the FG material, but achieved lower elongations. Deformation at elevated temperatures revealed that the fine-grained material achieved significantly larger elongations to failure than the T4P material in the temperature range of 350°C-450°C. Both materials behaved similarly at 500°C and 550°C. Above 500°C, the grain size was greatly reduced in the T4P material, and only a slightly increased in the fine-grained material. At temperatures above 450°C, the elongation to failure in both materials generally increased with increasing strain-rate. The poor performance of the T4P material at low temperatures was attributed to the precipitate characteristics of the sheet, which lead to elevated stresses and increased cavitation. The deformation mechanism of both materials was found to be controlled by dislocation climb, accommodated by the self diffusion of aluminium at 500°C and 550°C. The deformation mechanism in the fine-grained material transitioned to power law breakdown at lower temperatures. At 350°C to 450°C, the T4P material behaved similarly to a particle hardened material with an internal stress created by the precipitates. The reduction in grain size of the T4P material after deformation at 500°C and 550°C was suggested to be caused by dynamic recovery/recrystallization. The role of a finer grain-size in the deformation behaviour at elevated temperatures was mainly related to enhanced diffusion through grain boundaries. The differences in the behaviour of the two materials were mainly attributed to the difference in the precipitation characteristics of the materials.
Author: Karl U. Kainer
Publisher: John Wiley & Sons
ISBN: 3527605967
Category : Technology & Engineering
Languages : en
Pages : 293
Get Book Here
Book Description
The need for light-weight materials, especially in the automobile industry, created renewed interest in innovative applications of magnesium materials. This demand has resulted in increased research and development activity in companies and research institutes in order to achieve an improved property profile and better choice of alloy systems. Here, development trends and application potential in different fields like the automotive industry and communication technology are discussed in an interdisciplinary framework.
Author: Alejandro Zúñiga
Publisher:
ISBN:
Category :
Languages : en
Pages : 412
Get Book Here
Book Description
Author: Kiran N. Solanki
Publisher: Springer
ISBN: 3319523929
Category : Technology & Engineering
Languages : en
Pages : 642
Get Book Here
Book Description
The Magnesium Technology Symposium, the event on which this collection is based, is one of the largest yearly gatherings of magnesium specialists in the world. Papers represent all aspects of the field, ranging from primary production to applications to recycling. Moreover, papers explore everything from basic research findings to industrialization. Magnesium Technology 2017 covers a broad spectrum of current topics, including alloys and their properties; cast products and processing; wrought products and processing; forming, joining, and machining; corrosion and surface finishing; ecology; and structural applications. In addition, there is coverage of new and emerging applications.
Author: Vineet V. Joshi
Publisher: Springer
ISBN: 9783030057886
Category : Technology & Engineering
Languages : en
Pages : 0
Get Book Here
Book Description
The Magnesium Technology Symposium, the event on which this collection is based, is one of the largest yearly gatherings of magnesium specialists in the world. Papers represent all aspects of the field, ranging from primary production to applications to recycling. Moreover, papers explore everything from basic research findings to industrialization. Magnesium Technology 2019 covers a broad spectrum of current topics, including alloys and their properties; cast products and processing; wrought products and processing; forming, joining, and machining; corrosion and surface finishing; and structural applications. In addition, there is coverage of new and emerging applications.
Author: Bert Verlinden
Publisher: Elsevier
ISBN: 0080544487
Category : Technology & Engineering
Languages : en
Pages : 551
Get Book Here
Book Description
Thermo-Mechanical Processing of Metallic Materials describes the science and technology behind modern thermo-mechanical processing (TMP), including detailed descriptions of successful examples of its application in the industry. This graduate-level introductory resource aims to fill the gap between two scientific approaches and illustrate their successful linkage by the use of suitable modern case studies. The book is divided into three key sections focusing on the basics of metallic materials processing. The first section covers the microstructural science base of the subject, including the microstructure determined mechanical properties of metals. The second section deals with the current mechanical technology of plastic forming of metals. The concluding section demonstrates the interaction of the first two disciplines in a series of case studies of successful current TMP processing and looks ahead to possible new developments in the field. This text is designed for use by graduate students coming into the field, for a graduate course textbook, and for Materials and Mechanical Engineers working in this area in the industry. * Covers both physical metallurgy and metals processing* Links basic science to real everyday applications* Written by four internationally-known experts in the field
Author: Blair Edward Carlson
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 530
Get Book Here
Book Description
Author: L.L. Rokhlin
Publisher: CRC Press
ISBN: 1482265168
Category : Science
Languages : en
Pages : 256
Get Book Here
Book Description
Magnesium-based alloys containing rare-earth metals are important structural materials, as they combine low density with high-strength properties. This makes them particularly attractive for industry, especially in cases where the low weight of constructions is critical, as in aircraft and space apparatus construction. One of the remarkable feature
