Microstructural Deformation and Failure of an Al-Mg Alloy with a Bimodal Grain Size Distribution PDF Download
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Author: Andrew C. Magee
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: Andrew C. Magee
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: Andrew Magee
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 75
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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: Margaret Hyland
Publisher: Springer
ISBN: 3319482483
Category : Technology & Engineering
Languages : en
Pages : 1174
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Book Description
The Light Metals symposia are a key part of the TMS Annual Meeting & Exhibition, presenting the most recent developments, discoveries, and practices in primary aluminum science and technology. Publishing the proceedings from these important symposia, the Light Metals volume has become the definitive reference in the field of aluminum production and related light metal technologies. The 2015 collection includes papers from the following symposia: 1.Alumina and Bauxite 2.Aluminum Alloys: Fabrication, Characterization and Applications 3.Aluminum Processing 4.Aluminum Reduction Technology 5.Cast Shop for Aluminum Production 6.Electrode Technology for Aluminum Production 7.Strip Casting of Light Metals
Author: E. Henry Chia
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 248
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Author: Alejandro Zúñiga
Publisher:
ISBN:
Category :
Languages : en
Pages : 412
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Book Description
Author: Blair Edward Carlson
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 530
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Author: Zhe Jin
Publisher: TMS Publishing Company
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 576
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Book Description
"This is the proceedings of the third symposium on Hot Deformation in Aluminum Alloys, held in San Diego, CA, March 3-6, 2003."--p. xi.
Author: Ping Zhang
Publisher: Cuvillier Verlag
ISBN: 3865376169
Category :
Languages : en
Pages : 109
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Author: Wei Yuan
Publisher:
ISBN:
Category : Deformations (Mechanics)
Languages : en
Pages : 272
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Book Description
"Friction stir processing (FSP) is emerging as an effective tool for microstructural modification. Mg-Al-Zn alloys with different aluminum contents were subjected to FSP to achieve fine grained and ultrafine grained (UFG) structure. The objective of this work was to study the influence of microstructural length scale on the governing deformation and strengthening mechanisms of FSP magnesium alloys. FSP introduced strong basal fiber texture and processing parameter dependent grain/precipitate size and distribution. Grain refinement promoted non-basal dislocation activation at room temperature. The strength of the alloy increased as a consequence of grain refinement following classic Hall-Petch relationship to different extents due to texture effect. Remarkable difference in tensile behavior was observed when the dominant deformation mode changed from basal to non-basal slip for various grain sizes. Specimens which deformed mainly by basal slip exhibited low tensile strength, high degree of work hardening and fractured before developing a neck. However, specimens which deformed by non-basal slip showed high strength, low degree of work hardening and a large fraction of post-uniform strain as a result of increased strain rate sensitivity. A high ductility of ~65% in FSP magnesium was attributed to extensive basal dislocation slip with the additional work hardening from activation of extension twin. Grain refinement reduced the uniform strain significantly, especially for UFG magnesium due to the low work hardening rate and high rate of dislocation recovery. High strength magnesium alloy with ~435 MPa in tensile strength and~23% in ductility was achieved. The promising combination of strength and ductility was attributed to the UFG structure with low dislocation density and fine [Beta]-phase precipitates"--Abstract, leaf iv.
Author: Barry Sadler
Publisher: John Wiley & Sons
ISBN: 1118663071
Category : Technology & Engineering
Languages : en
Pages : 1410
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Book Description
The Light Metals series is widely recognized as the definitive source of information on new developments in aluminum production technology. This new volume presents proceedings from 2013's Light Metal Symposia, covering the latest research and technologies on such areas as alumina and bauxite, aluminum reduction technology, electrode technology for aluminum production, cast shop for aluminum production, aluminum processing aluminum alloys, and cost affordable titanium IV. It also includes papers from a keynote presentation session discussing impurities in the aluminum supply chain are also included.
