Joining ultrafine grained aluminium by friction stir welding – processing, microstructure and mechanical properties

Marta Lipinska, Lech Olejnik, Adam Pietras, Tomasz Brynk, Andrzej Rosochowski, Malgorzata Lewandowska, Jacek Golinski

Research output: Contribution to conferencePoster

Abstract

Nowadays different processes are used to improve mechanical properties of materials. In metallic materials, grain size refinement down to nanoscale is one of the most efficient strengthening mechanisms, as predicted by Hall-Petch relationship. Such microstructure refinement can be obtained in several ways, among others by severe plastic deformation (SPD). Although a tremendous progress has been made in the development of SPD methods, the main drawback is the restriction in billet dimensions. The most common shape – rods, are manufacturing with diameter about few or sometimes over a dozen millimetres. Incremental ECAP is a novel tool to manufacture plates with ultrafine grained structure. Possible sizes of plates are promising for future applications, e.g. in automotive industry. Another issue related to ultrafine grained materials is joining without losing their properties governed by the nanoscale structure. Traditional methods cause grain coarsening which is highly unwanted.

In this work plates from Al 1050 after Incremental ECAP were joined using Friction Stir Welding. The quality of joints was determined using microscopic observations. Also, the structure of joints and base materials was investigated by light microscopy and transmission electron microscopy. Mechanical properties were measured by microhardness and tensile tests. To investigate mechanical properties like yield strength and tensile strength mini samples were used. Samples were separately cut from the joints and initial materials as well. It allowed to investigate the differences in both areas.

The results revealed that joints zone are characterized by lower values of microhardness and tensile properties compared to base materials. Structure investigation showed changes in grain sizes caused by joining process.

Conference

ConferenceNanotechnology and Advanced Materials for Innovative Industry, Nano PL 2014
CountryPoland
CityKielce
Period15/10/1417/10/14

Fingerprint

Friction stir welding
Joining
Aluminum
Mechanical properties
Microstructure
Processing
Microhardness
Plastic deformation
Coarsening
Light transmission
Tensile properties
Automotive industry
Optical microscopy
Yield stress
Tensile strength
Transmission electron microscopy

Keywords

  • friction stir welding
  • ultrafine grained aluminium
  • severe plastic deformation

Cite this

Lipinska, M., Olejnik, L., Pietras, A., Brynk, T., Rosochowski, A., Lewandowska, M., & Golinski, J. (2014). Joining ultrafine grained aluminium by friction stir welding – processing, microstructure and mechanical properties. Poster session presented at Nanotechnology and Advanced Materials for Innovative Industry, Nano PL 2014, Kielce, Poland.
Lipinska, Marta ; Olejnik, Lech ; Pietras, Adam ; Brynk, Tomasz ; Rosochowski, Andrzej ; Lewandowska, Malgorzata ; Golinski, Jacek. / Joining ultrafine grained aluminium by friction stir welding – processing, microstructure and mechanical properties. Poster session presented at Nanotechnology and Advanced Materials for Innovative Industry, Nano PL 2014, Kielce, Poland.
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abstract = "Nowadays different processes are used to improve mechanical properties of materials. In metallic materials, grain size refinement down to nanoscale is one of the most efficient strengthening mechanisms, as predicted by Hall-Petch relationship. Such microstructure refinement can be obtained in several ways, among others by severe plastic deformation (SPD). Although a tremendous progress has been made in the development of SPD methods, the main drawback is the restriction in billet dimensions. The most common shape – rods, are manufacturing with diameter about few or sometimes over a dozen millimetres. Incremental ECAP is a novel tool to manufacture plates with ultrafine grained structure. Possible sizes of plates are promising for future applications, e.g. in automotive industry. Another issue related to ultrafine grained materials is joining without losing their properties governed by the nanoscale structure. Traditional methods cause grain coarsening which is highly unwanted.In this work plates from Al 1050 after Incremental ECAP were joined using Friction Stir Welding. The quality of joints was determined using microscopic observations. Also, the structure of joints and base materials was investigated by light microscopy and transmission electron microscopy. Mechanical properties were measured by microhardness and tensile tests. To investigate mechanical properties like yield strength and tensile strength mini samples were used. Samples were separately cut from the joints and initial materials as well. It allowed to investigate the differences in both areas.The results revealed that joints zone are characterized by lower values of microhardness and tensile properties compared to base materials. Structure investigation showed changes in grain sizes caused by joining process.",
keywords = "friction stir welding, ultrafine grained aluminium, severe plastic deformation",
author = "Marta Lipinska and Lech Olejnik and Adam Pietras and Tomasz Brynk and Andrzej Rosochowski and Malgorzata Lewandowska and Jacek Golinski",
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Lipinska, M, Olejnik, L, Pietras, A, Brynk, T, Rosochowski, A, Lewandowska, M & Golinski, J 2014, 'Joining ultrafine grained aluminium by friction stir welding – processing, microstructure and mechanical properties' Nanotechnology and Advanced Materials for Innovative Industry, Nano PL 2014, Kielce, Poland, 15/10/14 - 17/10/14, .

Joining ultrafine grained aluminium by friction stir welding – processing, microstructure and mechanical properties. / Lipinska, Marta; Olejnik, Lech; Pietras, Adam; Brynk, Tomasz; Rosochowski, Andrzej; Lewandowska, Malgorzata; Golinski, Jacek.

2014. Poster session presented at Nanotechnology and Advanced Materials for Innovative Industry, Nano PL 2014, Kielce, Poland.

Research output: Contribution to conferencePoster

TY - CONF

T1 - Joining ultrafine grained aluminium by friction stir welding – processing, microstructure and mechanical properties

AU - Lipinska, Marta

AU - Olejnik, Lech

AU - Pietras, Adam

AU - Brynk, Tomasz

AU - Rosochowski, Andrzej

AU - Lewandowska, Malgorzata

AU - Golinski, Jacek

PY - 2014/10/15

Y1 - 2014/10/15

N2 - Nowadays different processes are used to improve mechanical properties of materials. In metallic materials, grain size refinement down to nanoscale is one of the most efficient strengthening mechanisms, as predicted by Hall-Petch relationship. Such microstructure refinement can be obtained in several ways, among others by severe plastic deformation (SPD). Although a tremendous progress has been made in the development of SPD methods, the main drawback is the restriction in billet dimensions. The most common shape – rods, are manufacturing with diameter about few or sometimes over a dozen millimetres. Incremental ECAP is a novel tool to manufacture plates with ultrafine grained structure. Possible sizes of plates are promising for future applications, e.g. in automotive industry. Another issue related to ultrafine grained materials is joining without losing their properties governed by the nanoscale structure. Traditional methods cause grain coarsening which is highly unwanted.In this work plates from Al 1050 after Incremental ECAP were joined using Friction Stir Welding. The quality of joints was determined using microscopic observations. Also, the structure of joints and base materials was investigated by light microscopy and transmission electron microscopy. Mechanical properties were measured by microhardness and tensile tests. To investigate mechanical properties like yield strength and tensile strength mini samples were used. Samples were separately cut from the joints and initial materials as well. It allowed to investigate the differences in both areas.The results revealed that joints zone are characterized by lower values of microhardness and tensile properties compared to base materials. Structure investigation showed changes in grain sizes caused by joining process.

AB - Nowadays different processes are used to improve mechanical properties of materials. In metallic materials, grain size refinement down to nanoscale is one of the most efficient strengthening mechanisms, as predicted by Hall-Petch relationship. Such microstructure refinement can be obtained in several ways, among others by severe plastic deformation (SPD). Although a tremendous progress has been made in the development of SPD methods, the main drawback is the restriction in billet dimensions. The most common shape – rods, are manufacturing with diameter about few or sometimes over a dozen millimetres. Incremental ECAP is a novel tool to manufacture plates with ultrafine grained structure. Possible sizes of plates are promising for future applications, e.g. in automotive industry. Another issue related to ultrafine grained materials is joining without losing their properties governed by the nanoscale structure. Traditional methods cause grain coarsening which is highly unwanted.In this work plates from Al 1050 after Incremental ECAP were joined using Friction Stir Welding. The quality of joints was determined using microscopic observations. Also, the structure of joints and base materials was investigated by light microscopy and transmission electron microscopy. Mechanical properties were measured by microhardness and tensile tests. To investigate mechanical properties like yield strength and tensile strength mini samples were used. Samples were separately cut from the joints and initial materials as well. It allowed to investigate the differences in both areas.The results revealed that joints zone are characterized by lower values of microhardness and tensile properties compared to base materials. Structure investigation showed changes in grain sizes caused by joining process.

KW - friction stir welding

KW - ultrafine grained aluminium

KW - severe plastic deformation

UR - http://science24.com/paper/31279

UR - http://labnano.pl/NanoPL/

M3 - Poster

ER -

Lipinska M, Olejnik L, Pietras A, Brynk T, Rosochowski A, Lewandowska M et al. Joining ultrafine grained aluminium by friction stir welding – processing, microstructure and mechanical properties. 2014. Poster session presented at Nanotechnology and Advanced Materials for Innovative Industry, Nano PL 2014, Kielce, Poland.