The Role of Grain Boundaries in the Plastic Deformation of Aluminum
Author : E. S. Yakovleva
Publisher :
Page : 4 pages
File Size : 15,24 MB
Release : 1954
Category : Aluminum
ISBN :
Author : E. S. Yakovleva
Publisher :
Page : 4 pages
File Size : 15,24 MB
Release : 1954
Category : Aluminum
ISBN :
Author : Douglas L. Swisher
Publisher :
Page : 82 pages
File Size : 35,78 MB
Release : 2000-12-01
Category :
ISBN : 9781423532187
Equal channel-angular pressing (ECAP) is a recently developed method for deformation processing of material that can produce an ultra-fine grain structure in bulk material through severe plastic deformation. This study will present results on micro structural evolution during repetitive ECAP of pure aluminum. The principal method of data collection was Orientation Imaging Microscopy (OIM). The results of the study indicate that, after one ECAP pass, the structure is inhomogeneous and anisotropic, and consists mostly of deformation-induced features. After repetitive ECAP, the aluminum material exhibited a homogeneous grain size but retained an anisotropic character to the microstructure. After twelve ECAP passes the microstructure consisted mainly of fine grains surrounded by high-angle boundaries but an appreciable fraction of low-angle boundaries remained. This microstructure thus comprises a mixture of deformation-induced and recrystallization features. Further results were also obtained documenting the existence of deformation banding in this material as well as in a rolled aluminum alloy. This phenomenon may be general in nature and associated with severe plastic deformation in aluminum and its alloys.
Author : Diana Avadanii
Publisher :
Page : 0 pages
File Size : 26,58 MB
Release : 2022
Category :
ISBN :
Author : Michael Edward McMahon
Publisher :
Page : 232 pages
File Size : 27,56 MB
Release : 1996-12-01
Category :
ISBN : 9781423576730
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.
Author : Louisette Priester
Publisher : John Wiley & Sons
Page : 240 pages
File Size : 18,94 MB
Release : 2013-02-07
Category : Technology & Engineering
ISBN : 1118603109
The main purpose of this book is to put forward the fundamental role of grain boundaries in the plasticity of crystalline materials. To understand this role requires a multi-scale approach to plasticity: starting from the atomic description of a grain boundary and its defects, moving on to the elemental interaction processes between dislocations and grain boundaries, and finally showing how the microscopic phenomena influence the macroscopic behaviors and constitutive laws. It involves bringing together physical, chemical and mechanical studies. The investigated properties are: deformation at low and high temperature, creep, fatigue and rupture.
Author : W. Wurth Kriegel
Publisher : Springer
Page : 664 pages
File Size : 42,21 MB
Release : 1966
Category : Technology & Engineering
ISBN :
Author : C.T Forwood
Publisher : CRC Press
Page : 446 pages
File Size : 11,54 MB
Release : 1991-01-01
Category : Science
ISBN : 9780750301169
Electron Microscopy of Interfaces in Metals and Alloys examines the structure of interfaces in metals and alloys using transmission electron microscopy. The book presents quantitative methods of analysis and reviews the most significant work on interface structure over the last 20 years. It provides the first book description of the methods used for quantitative identification of Burgers vectors of interfacial dislocations, including the geometric analysis of periodicities in interface structure and the comparison of experimental and theoretical electron micrographs. The book explores low- and high-angle grain boundaries and interphase interfaces between neighboring grains, emphasizing interfacial dislocations and rigid-body displacements to the structure and properties of interfaces. It also analyzes the use of two-beam images and diffraction patterns for analysis and studies n-beam lattice imaging. The book includes numerous worked examples of the analysis of the structure of grain boundaries and interphase interfaces, which are particularly useful to those who need to consider the nature of intercrystalline interfaces.
Author : James Richard Cady
Publisher :
Page : 326 pages
File Size : 28,81 MB
Release : 1955
Category : Aluminum
ISBN :
Author : Rolf Berghammer
Publisher : Cuvillier Verlag
Page : 130 pages
File Size : 44,1 MB
Release : 2014-10-29
Category : Technology & Engineering
ISBN : 373694831X
A promising way to increase the strength of aluminum alloys is by grain refinement. Therefore the production of so-called ultra-fine grained (UFG) microstructures by severe plastic deformation (SPD) is a very interesting topic. One of the most common SPD processes is Equal Channel Angular Pressing (ECAP), which was compared to Confined Channel Die Pressing (CCDP) and cold rolling.In the focus of this work lays on the one hand the influence of different precipitation states on the formation of UFG structures and their influence on the mechanical properties and on the other hand it was examined if the thermal stability of these structures can be improved either by supersaturated solid solution(by impurity drag) or by precipitates (by grain boundary pinning).With a better understanding of the ongoing softening mechanisms a good combination of high strength and good ductility can be achievedby alternating SPD and heat treatment.
Author : John Robert Nadeau
Publisher :
Page : 64 pages
File Size : 39,4 MB
Release : 1953
Category : Aluminum
ISBN :