A new route for developing ultrafine-grained Al alloy strips using repetitive bending under tension

Saeed Tamimi; Giribaskar Sivaswamy; Hadi  Pirgazi; Babak Shalchi Amirkhiz; Shanmukha  Moturu; Amir Siddiq; Winfried Kockelmann; Paul Blackwell

doi:10.1016/j.matdes.2021.109750

A new route for developing ultrafine-grained Al alloy strips using repetitive bending under tension

Saeed Tamimi^* (Corresponding Author), Giribaskar Sivaswamy, Hadi Pirgazi, Babak Shalchi Amirkhiz, Shanmukha Moturu, Amir Siddiq, Winfried Kockelmann, Paul Blackwell

^*Corresponding author for this work

Engineering

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Abstract

In this work, the mechanical behaviour and microstructure changes of AA-7075 alloy subjected to a repetitive-bending-under-tension (R-BUT) process were studied. In the R-BUT process, a metallic strip undergoes repeated localised bending and unbending. Load-displacement curves derived from R-BUT tested samples displayed a drastic increase in elongation to failure as compared to samples subjected to standard tensile tests. Additionally, the results confirmed that the force required to deform the R-BUT samples is much reduced as compared to the load required during simple tension. Finite element analysis confirmed that the sample subjected to the R-BUT process underwent intense shear deformation. Transmission-electron-microscopy (TEM) and electron-backscattered-diffraction (EBSD) analysis of the deformed matrix from the ND-RD plane (through-thickness) exhibited evidence for the formation of fine grains. TEM analysis confirmed that the fine grains formed were in the size range of 200–400 nm. Intense shear deformation experienced by the matrix led to shearing followed by spheroidization of precipitate particles. The influence of precipitate particles on the grain refinement process through Particle Stimulated Nucleation of fine grains in the matrix is also presented. EBSD analysis suggested that a Continuous Dynamic Recrystallisation process is the key mechanism behind the grain refinement in the sample during R-BUT processing.

Original language	English
Article number	109750
Number of pages	18
Journal	Materials & Design
Volume	206
Early online date	20 Apr 2021
DOIs	https://doi.org/10.1016/j.matdes.2021.109750
Publication status	Published - Aug 2021

Bibliographical note

Acknowledgments
The authors would like to acknowledge the support provided by the Advanced Forming Research Centre (AFRC), University of Strathclyde (under the project AFRC_CATP_1186).

Keywords

Repetitive bending under tension
Severe plastic deformation
AA-7075 strip
Grain refinement

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Cite this

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title = "A new route for developing ultrafine-grained Al alloy strips using repetitive bending under tension",

abstract = "In this work, the mechanical behaviour and microstructure changes of AA-7075 alloy subjected to a repetitive-bending-under-tension (R-BUT) process were studied. In the R-BUT process, a metallic strip undergoes repeated localised bending and unbending. Load-displacement curves derived from R-BUT tested samples displayed a drastic increase in elongation to failure as compared to samples subjected to standard tensile tests. Additionally, the results confirmed that the force required to deform the R-BUT samples is much reduced as compared to the load required during simple tension. Finite element analysis confirmed that the sample subjected to the R-BUT process underwent intense shear deformation. Transmission-electron-microscopy (TEM) and electron-backscattered-diffraction (EBSD) analysis of the deformed matrix from the ND-RD plane (through-thickness) exhibited evidence for the formation of fine grains. TEM analysis confirmed that the fine grains formed were in the size range of 200–400 nm. Intense shear deformation experienced by the matrix led to shearing followed by spheroidization of precipitate particles. The influence of precipitate particles on the grain refinement process through Particle Stimulated Nucleation of fine grains in the matrix is also presented. EBSD analysis suggested that a Continuous Dynamic Recrystallisation process is the key mechanism behind the grain refinement in the sample during R-BUT processing.",

keywords = "Repetitive bending under tension, Severe plastic deformation, AA-7075 strip, Grain refinement",

author = "Saeed Tamimi and Giribaskar Sivaswamy and Hadi Pirgazi and {Shalchi Amirkhiz}, Babak and Shanmukha Moturu and Amir Siddiq and Winfried Kockelmann and Paul Blackwell",

note = "Acknowledgments The authors would like to acknowledge the support provided by the Advanced Forming Research Centre (AFRC), University of Strathclyde (under the project AFRC_CATP_1186).",

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doi = "10.1016/j.matdes.2021.109750",

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AU - Tamimi, Saeed

AU - Sivaswamy, Giribaskar

AU - Pirgazi, Hadi

AU - Shalchi Amirkhiz, Babak

AU - Moturu, Shanmukha

AU - Siddiq, Amir

AU - Kockelmann, Winfried

AU - Blackwell, Paul

N1 - Acknowledgments The authors would like to acknowledge the support provided by the Advanced Forming Research Centre (AFRC), University of Strathclyde (under the project AFRC_CATP_1186).

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Y1 - 2021/8

N2 - In this work, the mechanical behaviour and microstructure changes of AA-7075 alloy subjected to a repetitive-bending-under-tension (R-BUT) process were studied. In the R-BUT process, a metallic strip undergoes repeated localised bending and unbending. Load-displacement curves derived from R-BUT tested samples displayed a drastic increase in elongation to failure as compared to samples subjected to standard tensile tests. Additionally, the results confirmed that the force required to deform the R-BUT samples is much reduced as compared to the load required during simple tension. Finite element analysis confirmed that the sample subjected to the R-BUT process underwent intense shear deformation. Transmission-electron-microscopy (TEM) and electron-backscattered-diffraction (EBSD) analysis of the deformed matrix from the ND-RD plane (through-thickness) exhibited evidence for the formation of fine grains. TEM analysis confirmed that the fine grains formed were in the size range of 200–400 nm. Intense shear deformation experienced by the matrix led to shearing followed by spheroidization of precipitate particles. The influence of precipitate particles on the grain refinement process through Particle Stimulated Nucleation of fine grains in the matrix is also presented. EBSD analysis suggested that a Continuous Dynamic Recrystallisation process is the key mechanism behind the grain refinement in the sample during R-BUT processing.

AB - In this work, the mechanical behaviour and microstructure changes of AA-7075 alloy subjected to a repetitive-bending-under-tension (R-BUT) process were studied. In the R-BUT process, a metallic strip undergoes repeated localised bending and unbending. Load-displacement curves derived from R-BUT tested samples displayed a drastic increase in elongation to failure as compared to samples subjected to standard tensile tests. Additionally, the results confirmed that the force required to deform the R-BUT samples is much reduced as compared to the load required during simple tension. Finite element analysis confirmed that the sample subjected to the R-BUT process underwent intense shear deformation. Transmission-electron-microscopy (TEM) and electron-backscattered-diffraction (EBSD) analysis of the deformed matrix from the ND-RD plane (through-thickness) exhibited evidence for the formation of fine grains. TEM analysis confirmed that the fine grains formed were in the size range of 200–400 nm. Intense shear deformation experienced by the matrix led to shearing followed by spheroidization of precipitate particles. The influence of precipitate particles on the grain refinement process through Particle Stimulated Nucleation of fine grains in the matrix is also presented. EBSD analysis suggested that a Continuous Dynamic Recrystallisation process is the key mechanism behind the grain refinement in the sample during R-BUT processing.

KW - Repetitive bending under tension

KW - Severe plastic deformation

KW - AA-7075 strip

KW - Grain refinement

U2 - 10.1016/j.matdes.2021.109750

DO - 10.1016/j.matdes.2021.109750

M3 - Article

SN - 0261-3069

VL - 206

JO - Materials & Design

JF - Materials & Design

M1 - 109750

ER -

A new route for developing ultrafine-grained Al alloy strips using repetitive bending under tension

Abstract

Bibliographical note

Keywords

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