On the role of applying groove pressing technique before friction stir processing of copper: microstructure and mechanical evaluation

The effect of prior constrained groove pressing on friction stir processing (FSP) of pure copper was investigated. The results illustrate the development of high strain and strength of FSP samples along with an increased strength base metal as a result of applying for a prior constrained groove pressing (CGP) pass. The influences of further FSP passes on the microstructures, and mechanical properties were also shown. The microstructural evaluation of the specimens indicated up to 10 times grain size reduction in FSP specimens as well as equiaxed microstructural morphology. Mechanical properties of the specimens were carried out through tensile and microhardness tests. It was demonstrated that the FSP could improve the strength and ductility of the specimens simultaneously through improved mechanical properties of the base metal resulting from prior CGP. The performed calculations show that values of dislocation density of the CGPed specimens experienced significant change after applying for FSP passes.

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Numerical modeling and experimental investigation on the effect of rotation speed on microstructural evaluation and mechanical properties of copper during friction stir processing

Mechanics Based Design of Structures and Machines ◽

10.1080/15397734.2021.1960561 ◽

2021 ◽

pp. 1-17

Author(s):

Xiaoshan Xu ◽

Gongxing Yan

Keyword(s):

Mechanical Properties ◽

Experimental Investigation ◽

Numerical Modeling ◽

Friction Stir Processing ◽

Rotation Speed ◽

Friction Stir ◽

Microstructural Evaluation

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Microstructural Evaluation and Mechanical Properties of Al1050/TiO2-Graphite Hybrid Nanocomposite Produced Via Friction Stir Processing

Metallurgical and Materials Transactions A ◽

10.1007/s11661-019-05158-4 ◽

2019 ◽

Vol 50 (5) ◽

pp. 2443-2461

Author(s):

Mohammad Farshbaf Ahmadipour ◽

Mojtaba Movahedi ◽

Amir Hossein Kokabi

Keyword(s):

Mechanical Properties ◽

Friction Stir Processing ◽

Hybrid Nanocomposite ◽

Friction Stir ◽

Microstructural Evaluation

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Investigation on the anisotropy behavior of copper strips processed by a combination of FSP and ECAP

Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design and Applications ◽

10.1177/14644207211009554 ◽

2021 ◽

pp. 146442072110095

Author(s):

PM Keshtiban ◽

R Abdi Behnagh ◽

F Bashirzadeh ◽

Rasol Javadzadeh ◽

Abolfazl Mohsenzadeh

Keyword(s):

Mechanical Properties ◽

Grain Size ◽

Tensile Strength ◽

Ultimate Tensile Strength ◽

Base Metal ◽

Pure Copper ◽

Copper Sheet ◽

Friction Stir ◽

Refined Microstructure ◽

Average Grain Size

In this study, friction stir processed (FSP) pure copper sheet was equal channel angular pressed (ECAP). The purpose was to investigate the influence of ECAP on the microstructure and mechanical properties of the FSP-treated copper sheet. The dynamically recrystallized grained structure with the average grain size of ∼13 µm was found in the stir zone of the FSP. It was also revealed that FSP caused the enhancement of ultimate tensile strength compared to that of the base metal. Also, it was observed that ECAP led to further grain refinement and a tighter distribution of grains. A refined microstructure with an average grain size of ∼ 2 µm was achieved in copper sheets through FSP, followed by ECAP. The tensile strengths of the ECAP specimens were significantly increased to about 61 and 50% compared to the strengths of base metal and FSP, respectively. An overview of the results of this study showed that combined FSP/ECAP is an effective method for the mechanical improvement of the pure copper sheets.

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Microstructure Control and Mechanical Properties of Multipass Friction Stir Processed High Strength Aluminum Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.735.316 ◽

2012 ◽

Vol 735 ◽

pp. 316-321 ◽

Cited By ~ 1

Author(s):

Yutaka Matsuda ◽

Goroh Itoh ◽

Yoshinobu Motohashi

Keyword(s):

Mechanical Properties ◽

Aluminum Alloy ◽

Base Metal ◽

Friction Stir Processing ◽

Superplastic Deformation ◽

High Strength ◽

7075 Aluminum Alloy ◽

Friction Stir ◽

High Strength Aluminum Alloy ◽

Equiaxed Grains

Friction stir processing (FSP) causes fine-equiaxed microstructure[1]. In this study, microstructure and mechanical properties of a 7075 aluminum alloy subjected to multipass FSP, MP-FSP, are assessed. A new zone, PBZ, has been discovered between stir zones, SZs. The SZs are composed of fine-equiaxed grains, while PBZs are composed of two types of (fine-equiaxed and coarse-elongated) grains, both of which are still finer than those of base metal. Elongation at 773K of MP-FSPed specimen becomes larger than that of base metal, based on superplastic deformation due to the finer microstructure. Local elongation is smaller in PBZ than in SZ.

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