Thermally activated movement of screw dislocations in polygonized aluminum

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Abstract

In this paper, we study the evolution of polygonized dislocation structures and make an analysis of plastic deformation mechanisms under creep conditions at high temperatures in polygonized aluminum of 99.3% purity. Dislocations play a role of vital importance in the evolution of plastic deformation. The influence of dislocations on the σ - ε curve behavior as well as the shape of this curve have not yet been understood and explained. The absence of such understanding remains a problem nowadays. It is necessary to find and describe an important relationship between dislocation structures studied by means of Transmission Electron Microscopy (TEM) imag es under static conditions, the values for the yield strain, resistance to deformation, and the fracture limit. Concerning this relationship, it is relevant to mention here that the mechanical and thermal stability of defects at the sub-structural hardening drastically determines the stability of the polygonized structure under working conditions. Keeping in mind that polygonized structures are generated as a result of a thermo-mechanical treatment or directly under creep conditions, it is natural to expect that the instabilities of such structures are to be observed under much more stringent temperature and load conditions than those under which these structures were formed.
Original languageAmerican English
Pages (from-to)161-171
Number of pages143
JournalRevista Facultad de Ingenieria
StatePublished - 30 Sep 2013

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Screw dislocations
dislocation
Plastic deformation
Creep
aluminum
Aluminum
Thermomechanical treatment
Mechanical stability
plastic deformation
creep
Hardening
Thermodynamic stability
Transmission electron microscopy
Temperature
Defects
deformation mechanism
working conditions
hardening
defect
transmission electron microscopy

Cite this

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title = "Thermally activated movement of screw dislocations in polygonized aluminum",
abstract = "In this paper, we study the evolution of polygonized dislocation structures and make an analysis of plastic deformation mechanisms under creep conditions at high temperatures in polygonized aluminum of 99.3{\%} purity. Dislocations play a role of vital importance in the evolution of plastic deformation. The influence of dislocations on the σ - ε curve behavior as well as the shape of this curve have not yet been understood and explained. The absence of such understanding remains a problem nowadays. It is necessary to find and describe an important relationship between dislocation structures studied by means of Transmission Electron Microscopy (TEM) imag es under static conditions, the values for the yield strain, resistance to deformation, and the fracture limit. Concerning this relationship, it is relevant to mention here that the mechanical and thermal stability of defects at the sub-structural hardening drastically determines the stability of the polygonized structure under working conditions. Keeping in mind that polygonized structures are generated as a result of a thermo-mechanical treatment or directly under creep conditions, it is natural to expect that the instabilities of such structures are to be observed under much more stringent temperature and load conditions than those under which these structures were formed.",
author = "Pedro Tamayo-Meza and Viacheslav Yermishki and Juan Sandoval-Pineda and Luis Flores-Herrera and Narcizo Mu{\~n}oz-Aguirre",
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AU - Tamayo-Meza, Pedro

AU - Yermishki, Viacheslav

AU - Sandoval-Pineda, Juan

AU - Flores-Herrera, Luis

AU - Muñoz-Aguirre, Narcizo

PY - 2013/9/30

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N2 - In this paper, we study the evolution of polygonized dislocation structures and make an analysis of plastic deformation mechanisms under creep conditions at high temperatures in polygonized aluminum of 99.3% purity. Dislocations play a role of vital importance in the evolution of plastic deformation. The influence of dislocations on the σ - ε curve behavior as well as the shape of this curve have not yet been understood and explained. The absence of such understanding remains a problem nowadays. It is necessary to find and describe an important relationship between dislocation structures studied by means of Transmission Electron Microscopy (TEM) imag es under static conditions, the values for the yield strain, resistance to deformation, and the fracture limit. Concerning this relationship, it is relevant to mention here that the mechanical and thermal stability of defects at the sub-structural hardening drastically determines the stability of the polygonized structure under working conditions. Keeping in mind that polygonized structures are generated as a result of a thermo-mechanical treatment or directly under creep conditions, it is natural to expect that the instabilities of such structures are to be observed under much more stringent temperature and load conditions than those under which these structures were formed.

AB - In this paper, we study the evolution of polygonized dislocation structures and make an analysis of plastic deformation mechanisms under creep conditions at high temperatures in polygonized aluminum of 99.3% purity. Dislocations play a role of vital importance in the evolution of plastic deformation. The influence of dislocations on the σ - ε curve behavior as well as the shape of this curve have not yet been understood and explained. The absence of such understanding remains a problem nowadays. It is necessary to find and describe an important relationship between dislocation structures studied by means of Transmission Electron Microscopy (TEM) imag es under static conditions, the values for the yield strain, resistance to deformation, and the fracture limit. Concerning this relationship, it is relevant to mention here that the mechanical and thermal stability of defects at the sub-structural hardening drastically determines the stability of the polygonized structure under working conditions. Keeping in mind that polygonized structures are generated as a result of a thermo-mechanical treatment or directly under creep conditions, it is natural to expect that the instabilities of such structures are to be observed under much more stringent temperature and load conditions than those under which these structures were formed.

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