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Wednesday, July 29, 2020 | History

4 edition of Deformation mechanism of ultrafine-grained copper polycrystals found in the catalog.

Deformation mechanism of ultrafine-grained copper polycrystals

Ji Luo

Deformation mechanism of ultrafine-grained copper polycrystals

by Ji Luo

  • 155 Want to read
  • 26 Currently reading

Published by National Library of Canada in Ottawa .
Written in English


Edition Notes

Thesis (M.A.Sc.) -- University of Toronto, 2002.

SeriesCanadian theses = -- Th`eses canadiennes
The Physical Object
FormatMicroform
Pagination2 microfiches : negative.
ID Numbers
Open LibraryOL21790351M
ISBN 100612687880
OCLC/WorldCa54460012

A novel severe plastic deformation (SPD) method entitled elliptical cross-section spiral equal-channel extrusion (ECSEE) was proposed to fabricate ultrafine grained (UFG) pure copper.   As the grain size decreases beyond this point, the dominant mechanism of deformation switches from a dislocation-mediated process to grain boundary sliding, leading to material softening.

Producing ultrafine-grained (UFG) materials by means of severe plastic deformation (SPD) methods has made a significant progress within the past few decades. The topic has been of interest since the beginning of the last century at least, yet the historical studies on . The effect of grain size on the tensile plastic deformation of ultrafine-grained copper polycrystals is investigated using a two-dimensional simulation of dislocation dynamics.

Besterci M., Kvackaj T., Kocisko R., Bacso J. & Sulleiova K. Formation of ultrafine-grained (UFG) structure and mechanical properties by severe plastic deformation (SPD). Metalurg – (). [Google Scholar] Xie S. J., Liaw P. K. & Choo H. Tensile behavior and deformation mechanisms of bulk ultrafine-grained copper. J. Mater. The scheme of the grains of ultrafine-grained materials Conclusions Severe plastic deformation Introduction Terminology Structural models Energy principles of the mechanical effect on the solid Low-temperature dynamic recrystallisation Amorphisation and crystallisation during SPD Effect of the divisibility and direction of deformation The.


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Deformation mechanism of ultrafine-grained copper polycrystals by Ji Luo Download PDF EPUB FB2

Eventually, grain boundary mediated plasticity, i.e., grain boundary sliding became dominant in the ultrafine-grained (UFG) specimen having a mean grain size smaller than 1 μm. The transition of the deformation modes led to a significant increase of tensile elongation and Author: Ruixiao Zheng, Ruixiao Zheng, Jun-Ping Du, Jun-Ping Du, Si Gao, Hidetoshi Somekawa, Shigenobu Ogata.

Microstructure, Mechanical Behavior, and Functional Properties of HCP Metals Subjected to Severe Plastic Deformation Structural Superplasticity of Polycrystalline Materials Grain Boundary Sliding in Metallic Bi- and Tricrystals Percolation Mechanism of Deformation Processes in Ultrafine-Grained Polycrystals Book Edition: 2.

Book • Authors: 6 - Percolation Mechanism of Deformation Processes in Ultrafine-Grained Polycrystals. Pages Select 7 - Percolation Processes in a Network of Grain Boundaries in Ultrafine-Grained Materials.

Book chapter Full text access. Mechanical properties, characteristic features of deformation behavior, the activation energy for plastic deformation, strain rate sensitivity and activation volume of ultrafine-grained (UFG) and conventional coarse-grained (CG) copper have been studied by tension in the temperature interval of – K and in the strain rate interval of ×10 −2 –×10 −5 s − by:   Based on the dominant deformation mechanisms operating with different grain sizes, the grain size, d, can be categorized into three groups: nano-grained (NG) metals (d ultrafine-grained (UFG) metals (d ≈ nm to 1 μm), and conventional coarse-grained (CG) metals (d > 1 μm).

Severe plastic deformation (SPD) techniques are the Author: M. Goto, T. Yamamoto, S.Z. Han, S.H. Lim, S. Kim, J.-H. Ahn, S.J. Lee, T. Yakushiji, J. Lee. In copper an ultrafine-grained microstructure can be changed gradually from fully ultrafine-grained over a bimodal microstructure to a fully coarsened microstructure by heat treatment.

Strain rate sensitivity measurements can be used to get a deeper understanding of the basic deformation mechanisms in the different microstructures. About this book. Proceedings of a symposium sponsored by the Shaping and Forming Committee of the Materials Processing and Manufacturing Division (MPMD) and the Mechanical Behavior Committee (Jt.

Deformation Mechanisms at Different Grain Sizes in a Cryogenically Ball‐Milled Al‐Mg Alloy (Pages: ) Dry Sliding Wear Behavior of. Copper Alloys Early Applications and Current Performance Enhancing Processes 96 3.

Ultrafine-grained copper Severe plastic deformation of metallic materials has attracted intensive attention of researchers in material science within the last two decades. The main expectation both of. Chapter 6: Percolation Mechanism of Deformation Processes in Ultrafine-Grained Polycrystals.

Percolation mechanism of the formation of a band of cooperative grain boundary sliding. Conditions of formation of CGBS bands as the condition of realisation of the superplastic deformation regime.

Shear rate along the CGBS band. Main microstructural features of ultrafine-grained (UFG) polycrystalline oxygen-free copper (Cu–OF) obtained by direct and equal-channel angular hydrostatic extrusion were studied by EBSD and XRD methods.

The effect of microstructure on the temperature dependences of the yield stress and strain rate sensitivity of the deforming stress was investigated using tensile and stress relaxation.

Request PDF | Mechanisms of cyclic plastic deformation in ultrafine-grain copper produced by severe plastic deformation | Fatigue properties and microstructure of ultrafine-grain (UFG) coppers of. The strengthening mechanism of the metallic material is related to the hindrance of the dislocation motion, and it is possible to achieve superior strength by maximizing these obstacles.

In this. Tensile behavior and deformation mechanisms of bulk ultrafine-grained copper Tensile behavior and deformation mechanisms of bulk ultrafine-grained copper Xie, S.; Liaw, P.; Choo, H.

J Mater Sci () – DOI /s Tensile behavior and deformation mechanisms of bulk ultrafine-grained copper S. Xie Æ P. The tensile behaviors of the ultrafine-grained (UFG) pure copper prepared by cold rolling have been investigated.

The UFG-Cu exhibited high strengths and low ductility. The ductile dimple-like fracture surfaces and persistent-slip-bands (PSBs)-like local shear bands in the tension-deformed UFG-Cu were observed, both of which typically spanned.

The review of the theoretical models, which describes mechanisms of deformation twinning in nanocrystalline and ultrafine-grained materials, is presented. Realization of special mechanisms of nanoscale deformation twin generation at locally distorted grain boundaries (GBs) in nanocrystalline and ultrafine-grained materials is observed.

In particular, the micromechanisms of deformation twin. Deformation patterns of two samples with different twin-boundary spacing but the same grain size d = 20 nm are shown in Fig.

2 (see also Supplementary Discussion 1).The result for. Deformation Types in Single Crystals. In general, the plastic deformation of a single crystal can be divided into two types: slip and twinning (Figure 2 a) [].Slip refers to sliding of a part of the crystal on a certain crystal plane (slip plane) along a certain direction (slip direction) relative to another part under the action of shear stress.

Dhal A., Panigrahi S.K., Shunmugam M.S. () Deformation Behaviour and Fracture Mechanism of Ultrafine-Grained Aluminium Developed by Cryorolling. In: Dixit U., Narayanan R.

(eds) Strengthening and Joining by Plastic Deformation. Lecture Notes on Multidisciplinary Industrial Engineering. Springer, Singapore. First Online 06 June Mughrabi, H. and Wang, R. () Cyclic stress-strain response and high-cycle fatigue behaviour of copper polycrystals, in Basic Mechanisms in Fatigue of Metals, edited by P.

Lukáš and J. Polák, Elsevier, Amsterdam, pp. 1– Creep deformation in ultrafine-grained ( to 1μm) Fe-doped magnesia polycrystals is studied in compression, at temperatures of to ° C, and constant loads of 50 to MPa. The stress exponent observed to be nearly unity and the strong grain size sensitivity (ė∼d −) suggest that diffusional creep mechanisms dominate the deformation.

Superplasticity and grain boundaries in ultrafine-grained materials. texture and ensembles of grain boundaries in materials produced by severe plastic deformation.

The book is highly beneficial to Percolation Mechanism of Deformation Processes in Ultrafine-Grained Polycrystals Percolation mechanism of the formation of a band of.

Article Dominating Deformation Mechanisms in Ultrafine-grained Chrom Best regards, Daniel. such as copper, brass and austenitic stainless steels. In most of the FEM books .Book Description. Plastic Deformation of Nanostructured Materials offers comprehensive analysis on the most important data and results in the field of materials strength and mechanics.

This reference systematically examines the special features of the mechanical behavior and corresponding structural mechanisms of crystal structure defects with grain sizes that range from meso- to micro- levels.