Equal Channel Angular Pressing (ECAP) is one of the methods which allows to obtain ultrafine-grained and nanocrystalline metallic materials. It is well known that microstructure of materials pro-cessed by ECAP in not very stable. There were published many experimental and theoretical evidences of this fact obtained by various methods such as microstructure observations, properties measurement and computer modeling.
The aim of presented paper was to investigate the thermal stability of microstructure and mechanical properties of the Al 5483 alloy processed by ECAP. As a result of performed investigations it was concluded that accumulated plastic deformation has no influence on the thermal stability of Al 5483 alloy processed by ECAP. It was also found that properly chosen parameters of ECAP and subsequent annealing allows to produce materials with high strength and plasticity.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3543

Jarosz, L.

Nowak, K.

Olejnik, L.

Pakiela, Z.

SocioEconomic Challenges Journal (Sumy State University)

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE  
NANOMATERIALS: APPLICATIONS AND PROPERTIES 
Vol. 2 No 2, 02NNPA03(2pp) (2013) 
 
 
2304-1862/2013/2(2)02NNPA03(2) 02NNPA03-1  2013 Sumy State University 
Thermal Stability and Mechanical Properties of 5483 Al Alloy Processed by ECAP 
 
Zbigniew Pakiela1,*, Lukasz Jarosz1,†, Katarzyna Nowak1,‡, Lech Olejnik2,§ 
 
1 Faculty of Materials Science Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw, Poland 
2 Faculty of Production Engineering, Warsaw University of Technology, Narbutta 85, 02-524 Warsaw, Poland 
 
(Received 28 June 2013; published online 03 September 2013) 
 
Equal Channel Angular Pressing (ECAP) is one of the methods which allows to obtain ultrafine-
grained and nanocrystalline metallic materials. It is well known that microstructure of materials pro-
cessed by ECAP in not very stable. There were published many experimental and theoretical evidences of 
this fact obtained by various methods such as microstructure observations, properties measurement and 
computer modeling.  
The aim of presented paper was to investigate the thermal stability of microstructure and mechanical 
properties of the Al 5483 alloy processed by ECAP. As a result of performed investigations it was concluded 
that accumulated plastic deformation has no influence on the thermal stability of Al 5483 alloy processed 
by ECAP. It was also found that properly chosen parameters of ECAP and subsequent annealing allows to 
produce materials with high strength and plasticity. 
 
Keywords: ECAP, 5483 Alloy, Mechanical Properties, Thermal Stability. 
 
  PACS numbers: 66.70.Df s, 63.50.Gh 
 
 
                                                        
* zpakiela@inmat.pw.edu.pl 
† look4u@wp.pl 
‡ kasia.mn@wp.pl 
§ lolejnik@wip.pw.edu.pl 
1. INTRODUCTION 
 
Equal Channel Angular Pressing (ECAP) is one of the 
methods which allows to obtain ultrafine-grained and 
nanocrystalline metallic materials [1,2]. One of the draw-
backs of the materials processed by ECAP is their low 
thermal stability [3,4]. There were published many exper-
imental and theoretical evidences of this fact obtained by 
various methods such as microstructure observations, 
microhardness measurements and computer modeling. 
The aim of presented paper was to investigate the 
thermal stability of microstructure and mechanical 
properties of the Al 5483 alloy processed by ECAP. 
 
2. EXPERIMENTAL 
 
Rectangular samples of 5483 Al alloy processed by 
ECAP in an L-shaped, 90 channel at 180 C using 
route Bc were used for investigations. For the aim of 
the investigations there were performed standard tests, 
such as micro-hardness measurements, microstructure 
observations and tensile tests of non-standard micro-
specimens cut-out from various parts of the samples 
processed by ECAP. The investigation was carried out 
for samples subjected to 1, 4 and 8 passes of ECAP. 
 
3. RESULTS AND DISCUSSION 
 
Microstructure of 5483 alloy specimens after equal 
channel angular pressing and annealing at a tempera-
ture range 265-350 °C is shown in Fig. 1. It is visible 
that grain growth occurred faster in the samples after 
1 ECAP pass than after 8 passes. 
It was found that mechanical properties (micro-
hardness, yield strength, tensile strength and elonga-
tion to rupture) are stable up to about 250 C. It shown 
in Figures 2-6. It was also found that annealing in the 
temperature range 250-300 C results in the strong 
changes of grain size and mechanical properties. At the 
higher temperatures (300-350 C) stabilizations of me-
chanical properties was observed.  
Materials annealed in the temperature range 
265 ÷ 350 C had higher yield strength, tensile strength 
and elongation to failure than the material in the ini-
tial state. Such experimental observations allows to 
conclude that ECAP processing and subsequent an-
nealing can be a way of improvement both: strength 
and plasticity of metallic materials. 
 
 
Fig. 1 - Microstructure of 5483 alloy processed by ECAP 
and annealed 
 
 
Z. PAKIELA, L. JAROSZ, K. NOWAK, L. OLEJNIK PROC. NAP 2, 02NNPA03 (2013) 
 
 
02NNPA03-2 
 
 
Fig. 2 - Tensile strength of 5483 alloy processed by ECAP in a 
function of annealing temperature 
 
 
Fig. 3 - Yield strength of 5483 alloy in a function of annealing 
temperature 
 
 
Fig. 4 - Elongation to rupture of 5483 alloy processed by 
ECAP in a function of annealing temperature 
 
 
 
Fig. 5 - Microhardness of 5483 alloy processed by ECAP 
in a function of annealing temperature 
 
 
 
Fig. 6 - Stress-strain curves of aluminium 5483 alloy after 
8 ECAP passes and annealing 
 
4. CONCUSIONS 
 
Accumulated plastic deformation has no influence 
on the thermal stability of Al 5483 alloy processed by 
ECAP. 
Properly chosen parameters of ECAP and subse-
quent annealing allows to produce materials with high 
strength and plasticity. 
 
REFERENCES 
 
1. R.Z. Valiev, A.V. Korznikov, R.R. Mulyukov, Mater. Sci. 
Engn. A 168, 141 (1993). 
2. R.Z. Valiev, R.K. Islamgaliev, I.V. Alexandrov,  
Prog. Mater. Sci. 45, 103 (2000). 
3. N. Krasilnikov, W. Łojkowski, Z. Pakieła, R. Valiev, Mater. 
Sci. Engn. A 397, 330 (2005). 
4. R.Z. Valiev, T.G. Langdon, Progress in Materials Science, 
51, 881 (2006). 
 


Thermal Stability and Mechanical Properties of 5483 Al Alloy Processed by ECAP

Electronic Sumy State University Institutional Repository

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE  NANOMATERIALS: APPLICATIONS AND PROPERTIES Vol. 2 No 2, 02NNPA03(2pp) (2013)   2304-1862/2013/2(2)02NNPA03(2) 02NNPA03-1  2013 Sumy State University Thermal Stability and Mechanical Properties of 5483 Al Alloy Processed by ECAP  Zbigniew Pakiela1,*, Lukasz Jarosz1,†, Katarzyna Nowak1,‡, Lech Olejnik2,§  1 Faculty of Materials Science Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw, Poland 2 Faculty of Production Engineering, Warsaw University of Technology, Narbutta 85, 02-524 Warsaw, Poland  (Received 28 June 2013; published online 03 September 2013)  Equal Channel Angular Pressing (ECAP) is one of the methods which allows to obtain ultrafine-grained and nanocrystalline metallic materials. It is well known that microstructure of materials pro-cessed by ECAP in not very stable. There were published many experimental and theoretical evidences of this fact obtained by various methods such as microstructure observations, properties measurement and computer modeling.  The aim of presented paper was to investigate the thermal stability of microstructure and mechanical properties of the Al 5483 alloy processed by ECAP. As a result of performed investigations it was concluded that accumulated plastic deformation has no influence on the thermal stability of Al 5483 alloy processed by ECAP. It was also found that properly chosen parameters of ECAP and subsequent annealing allows to produce materials with high strength and plasticity.  Keywords: ECAP, 5483 Alloy, Mechanical Properties, Thermal Stability.    PACS numbers: 66.70.Df s, 63.50.Gh                                                           * zpakiela@inmat.pw.edu.pl † look4u@wp.pl ‡ kasia.mn@wp.pl § lolejnik@wip.pw.edu.pl 1. INTRODUCTION  Equal Channel Angular Pressing (ECAP) is one of the methods which allows to obtain ultrafine-grained and nanocrystalline metallic materials [1,2]. One of the draw-backs of the materials processed by ECAP is their low thermal stability [3,4]. There were published many exper-imental and theoretical evidences of this fact obtained by various methods such as microstructure observations, microhardness measurements and computer modeling. The aim of presented paper was to investigate the thermal stability of microstructure and mechanical properties of the Al 5483 alloy processed by ECAP.  2. EXPERIMENTAL  Rectangular samples of 5483 Al alloy processed by ECAP in an L-shaped, 90 channel at 180 C using route Bc were used for investigations. For the aim of the investigations there were performed standard tests, such as micro-hardness measurements, microstructure observations and tensile tests of non-standard micro-specimens cut-out from various parts of the samples processed by ECAP. The investigation was carried out for samples subjected to 1, 4 and 8 passes of ECAP.  3. RESULTS AND DISCUSSION  Microstructure of 5483 alloy specimens after equal channel angular pressing and annealing at a tempera-ture range 265-350 °C is shown in Fig. 1. It is visible that grain growth occurred faster in the samples after 1 ECAP pass than after 8 passes. It was found that mechanical properties (micro-hardness, yield strength, tensile strength and elonga-tion to rupture) are stable up to about 250 C. It shown in Figures 2-6. It was also found that annealing in the temperature range 250-300 C results in the strong changes of grain size and mechanical properties. At the higher temperatures (300-350 C) stabilizations of me-chanical properties was observed.  Materials annealed in the temperature range 265 ÷ 350 C had higher yield strength, tensile strength and elongation to failure than the material in the ini-tial state. Such experimental observations allows to conclude that ECAP processing and subsequent an-nealing can be a way of improvement both: strength and plasticity of metallic materials.   Fig. 1 - Microstructure of 5483 alloy processed by ECAP and annealed   Z. PAKIELA, L. JAROSZ, K. NOWAK, L. OLEJNIK PROC. NAP 2, 02NNPA03 (2013)   02NNPA03-2   Fig. 2 - Tensile strength of 5483 alloy processed by ECAP in a function of annealing temperature   Fig. 3 - Yield strength of 5483 alloy in a function of annealing temperature   Fig. 4 - Elongation to rupture of 5483 alloy processed by ECAP in a function of annealing temperature    Fig. 5 - Microhardness of 5483 alloy processed by ECAP in a function of annealing temperature    Fig. 6 - Stress-strain curves of aluminium 5483 alloy after 8 ECAP passes and annealing  4. CONCUSIONS  Accumulated plastic deformation has no influence on the thermal stability of Al 5483 alloy processed by ECAP. Properly chosen parameters of ECAP and subse-quent annealing allows to produce materials with high strength and plasticity.  REFERENCES  1. R.Z. Valiev, A.V. Korznikov, R.R. Mulyukov, Mater. Sci. Engn. A 168, 141 (1993). 2. R.Z. Valiev, R.K. Islamgaliev, I.V. Alexandrov,  Prog. Mater. Sci. 45, 103 (2000). 3. N. Krasilnikov, W. Łojkowski, Z. Pakieła, R. Valiev, Mater. Sci. Engn. A 397, 330 (2005). 4. R.Z. Valiev, T.G. Langdon, Progress in Materials Science, 51, 881 (2006).  

https://essuir.sumdu.edu.ua/bitstream/123456789/35435/1/princon_2013_2_2_79.pdf

Thermal Stability and Mechanical Properties of 5483 Al Alloy Processed by ECAP

Abstract

Similar works

Full text

Available Versions

SocioEconomic Challenges Journal (Sumy State University)

Electronic Sumy State University Institutional Repository