Study of Plastic Flow of Aluminum Alloy Using Digital Speckle Photography

2016 ◽  
Vol 683 ◽  
pp. 118-124
Author(s):  
Anna V. Bochkareva ◽  
Aleksey G. Lunev ◽  
Svetlana A. Barannikova ◽  
Lev Zuev
Keyword(s):  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Hydrogen Embrittlement ◽  
Plastic Flow ◽  
Flow Behavior ◽  
Local Strain ◽  
Image Technique ◽  
Electrolytic Hydrogenation ◽  
Digital Speckle ◽  
Localized Plastic Deformation

The effect of hydrogen embrittlement on the localized plastic deformation of aluminum alloy D1 was investigated. The studies were performed for the test samples of aluminum alloy subjected to electrolytic hydrogenation. It is found that the mechanical properties and localized plastic deformation parameters of aluminum alloy are affected adversely by hydrogen embrittlement. The hydrogenated counterpart of alloy has a lower degree of ductility relative to the original alloy; however, the plastic flow behavior of material remains virtually unaffected. The deformation diagrams were examined for the deformed samples of aluminum alloy. These are found to show all the plastic flow stages: the linear, parabolic and pre-failure stages would occur for the respective values of the exponent n from the Ludwik-Holomon equation. Using digital speckle image technique, the local strain patterns were being registered for the original alloy D1 and the counterpart subjected to electrolytic hydrogenation for 100 h.

The effect of hydrogen embrittlement on the localized plastic deformation of aluminum alloy

2015 ◽  
Author(s):  
Anna Bochkareva ◽  
Aleksey Lunev ◽  
Svetlana Barannikova ◽  
Vadim Gorbatenko ◽  
Galina Shlyakhova ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Hydrogen Embrittlement ◽  
Localized Plastic Deformation

The Effect of Electrolytic Hydrogenation on the Plastic Flow of Aluminum Alloy

2015 ◽  
Vol 756 ◽  
pp. 59-64
Author(s):  
Anna V. Bochkareva ◽  
Aleksey G. Lunev ◽  
Svetlana A. Barannikova ◽  
Lev B. Zuev
Keyword(s):  
Aluminum Alloy ◽  
Hydrogen Embrittlement ◽  
Plastic Flow ◽  
Electrochemical Cell ◽  
Flow Curves ◽  
Microscopy Method ◽  
Electrolytic Hydrogenation ◽  
Scanning Electron Microscopy Method ◽  
Electron Microscopy Method ◽  
Deformation Diagrams

The effect of hydrogen embrittlement on the plastic flow of aluminum alloy D1 was investigated. The studies were performed for the test samples of aluminum alloy subjected to electrolytic hydrogenation in a three electrode electrochemical cell at a controlled constant cathode potential. It is found that the mechanical properties and plastic flow curves of aluminum alloy are affected adversely by hydrogen embrittlement. The hydrogenated counterpart of alloy has a lower degree of ductility relative to the original alloy. The deformation diagrams were examined for the deformed samples of aluminum alloy. These are found to show all the plastic flow stages: the linear, parabolic and pre-failure stages would occur for the respective values of the exponent n from the Ludwik-Holomon equation. Microhardness tests were performed for as-treated aluminum alloy D1. Using scanning electron microscopy method, the changes in the fracture surface were investigated.

scholarly journals Study of Microstructure and Mechanical Properties Effects on Workpiece Quality in Sheet Metal Extrusion Process

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Chatkaew Suriyapha ◽  
Bopit Bubphachot ◽  
Sampan Rittidech
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Sheet Metal ◽  
Material Flow ◽  
Flow Behavior ◽  
Fem Simulation ◽  
Localized Plastic Deformation ◽  
Metal Extrusion ◽  
Microstructure Effect ◽  
1045 Steel

Sheet metal extrusion is a metal forming process in which the movement of a punch penetrates a sheet metal surface and it flows through a die orifice; the extruded parts can be deflected to have an extrusion cavity and protrusion on the opposite side. Therefore, this process results in a narrow region of highly localized plastic deformation due to the formation and microstructure effect on the work piece. This research investigated the characteristics of the material-flow behavior during the formation and its effect on the microstructure of the extruded sheet metal using the finite element method (FEM). The actual parts and FEM simulation model were developed using a blank material made from AISI-1045 steel with a thickness of 5 mm; the material’s behavior was determined subject to the punch penetration depths of 20%, 40%, 60%, and 80% of the sheet thickness. The results indicated the formation and microstructure effects on the sheet metal extrusion parts and defects. Namely, when increasing penetration, narrowing the die orifice the material flows through, the material was formed by extruding, and defects were visibility, and the microstructure of the material’s grains’ size was flat and very fine. Extrusion defects were not found in the control material flow. The region of highly localized plastic deformation affected the material gain and mechanical properties. The FEM simulation results agreed with the experimental results. Moreover, FEM could be investigated as a tool to decrease the cost and time in trial and error procedures.

Evolution of Macro-Scale Plastic Flow Localization of Tri-Layered Stainless Steel - Low Carbon Steel - Stainless Steel Metal with Digital Image Correlation Method

2016 ◽  
Vol 870 ◽  
pp. 60-65 ◽  
Author(s):  
S.A. Barannikova ◽  
Lev B. Zuev ◽  
A.V. Bochkareva ◽  
A.G. Lunev ◽  
Yu.V. Li ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Stainless Steel ◽  
Carbon Steel ◽  
Digital Image Correlation ◽  
Plastic Flow ◽  
Low Carbon Steel ◽  
Correlation Method ◽  
Image Correlation ◽  
Low Carbon ◽  
Localized Plastic Deformation

Evolution of localized plastic deformation in tri-layered metal material casting consistng of the working part (layer) from austenitic stainless steel and bearing part from low-carbon steel was investigated. The pictures of localization of the plastic flow during the process of uniaxial tension were obtained by means of the digital image correlation method (DIC). Using optical microscopy methods, the changes in the fracture surface were investigated. The deformation diagrams were examined for deformed samples of tri-layered metal. These were found to show all the plastic flow stages: the linear, parabolic and pre-failure stages would occur for the respective values of the exponent n from the Lüdwik-Holomon equation. The analysis of the plastic flow stages and localized plastic deformation parameters was performed.

Strain Hardening Behaviour of PM Alloys with Heterogeneous Microstructure

2007 ◽  
Vol 534-536 ◽  
pp. 741-744 ◽  
Author(s):  
Giovanni Straffelini
Keyword(s):  
Plastic Deformation ◽  
Strain Hardening ◽  
Flow Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Acoustic Resonance ◽  
Matrix Microstructure ◽  
The Matrix ◽  
Heterogeneous Matrix ◽  
Localized Plastic Deformation

Tensile stress-strain and dynamic acoustic resonance tests were performed on Fe-C-Ni- Cu-Mo high-strength steels, characterized by a heterogeneous matrix microstructure and the prevalence of open porosity. All materials display the first yielding phenomenon and, successively, a continuous yielding behavior. This flow behavior can be described by the Ludwigson equation and developes through three stages: the onset of localized plastic deformation at the pore edges; the evolution of plastic deformation at the pore necks (where the austenitic Ni-rich phase is predominant); the spreading of plastic deformation in the interior of the matrix. The analytical modeling of the strain hardening behavior made it possible to obtain the boundaries between the different deformation stages.

Suppression of Intergranular Fracture in 7000 Series Aluminum Alloys

2021 ◽  
Vol 1016 ◽  
pp. 1811-1815
Author(s):  
Goroh Itoh ◽  
Keisuke Hiyama ◽  
Bo Fan Lyu ◽  
Junya Kobayashi
Keyword(s):  
Plastic Deformation ◽  
Aluminum Alloys ◽  
Hydrogen Embrittlement ◽  
Fracture Surface ◽  
Intergranular Fracture ◽  
Boundary Migration ◽  
Type I ◽  
Precipitate Microstructure ◽  
Localized Plastic Deformation ◽  
Controlling Processes

The 7000 series aluminum alloys suffer from intergranular fracture (IGF) that limits the use of the alloys, although they have highest strength among aluminum alloys. The types of IGF can be classified into two categories: (i) with smooth fracture surface showing practically no plastic deformation that takes place in hydrogen embrittlement and stress corrosion cracking, and (ii) with shallow and fine dimples on the fracture surface showing localized plastic deformation inside precipitate free zones. In this study, attempts have been made to suppress the IGF of both types by (a) controlling precipitate microstructure on grain boundaries by quench control and (b) controlling grain boundary morphology by strain induced boundary migration. The IGF of type (i) (hydrogen embrittlement) was successfully suppressed both by the two controlling processes.

scholarly journals Analysis of Plastic Flow Localization in Bimetal Electrolytically Saturated with Hydrogen

2018 ◽  
Vol 7 (2.23) ◽  
pp. 475
Author(s):  
S Barannikova ◽  
Yu. Li ◽  
A Malinovskiy ◽  
L Zuev
Keyword(s):  
Plastic Deformation ◽  
Electrochemical Cell ◽  
Correlation Method ◽  
Image Correlation ◽  
Low Carbon ◽  
Plastic Yielding ◽  
Flow Localization ◽  
Hydrogen Saturation ◽  
Electrolytic Hydrogenation ◽  
Localized Plastic Deformation

Plastic deformation of bimetal compound of austenitic stainless and low-carbon construction steels, resistant to corrosion, is localized through the digital image correlation method upon the uniaxial tension of sample. The evolution of zones of plastic deformation in bimetal is inspected upon the onset of the process and is exposed to hydrogen saturation in a three-electrode electrochemical cell at a controlled constant cathode potential for 6 hours. Localized plastic deformation zones are found to form and evolve during the tension of bimetal samples both at the onset and after 6 hour of the electrolytic hydrogenation throughout the plastic yielding in the primary, protective and transitional layers of the bimetal. The bimetal fracture is initiated by stress concentrated in the bimetal transition layer. Nucleation and propagation of a crack is observed at early work-hardening stages. The fracture of bimetal after hydrogenation is established to be more ductile as compared with precursor.  

scholarly journals Rate Dependence of Serrated Flow During Nanoindentation of a Bulk Metallic Glass

2002 ◽  
Vol 17 (7) ◽  
pp. 1651-1654 ◽  
Author(s):  
C. A. Schuh ◽  
T. G. Nieh ◽  
Y. Kawamura
Keyword(s):  
Plastic Deformation ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Plastic Flow ◽  
High Strain ◽  
Flow Behavior ◽  
Strain Rates ◽  
Serrated Flow ◽  
Tip Velocity ◽  
Indentation Strain

Plastic deformation of Pd–40Ni–20P bulk metallic glass (BMG) was investigated by instrumented nanoindentation experiments over a broad range of indentation strain rates. At low rates, the load–displacement curves during indentation exhibited numerous serrations or pop-ins, but these serrations became less prominent as the indentation rate was increased. Using the tip velocity during pop-in as a gauge of serration activity, we found that serrated flow is only significant at indentation strain rates below about 1–10/s. This result suggests a transition in plastic flow behavior at high strain rates, in agreement with prior studies of BMGs under different modes of loading.

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