Encyclopedie de la recherche sur l'aluminium au Quebec - Edition 2014 | Page 75

TRANSFORMATION and Cu AdditionsTRANSFORMATION AND APPLICATIONS
Effect of Mn ET APPLICATIONS // on Hot

Deformation Behavior of Dilute Al-Fe-Si Alloys

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EFFET DES ADDITIONS DE Mn ET Cu SUR LA DÉFORMATION À CHAUD DES ALLIAGES DILUÉS Al-Fe-Si

Effet des additions de Mn et Cu sur le
déformation à chaud des alliages dilués Al-Fe-Si

EFFECT OF Mn AND Cu ADDITIONS ON HOT DEFORMATION BEHAVIOR OF DILUTE Al-Fe-Si ALLOYS
M. Shakiba1, N. Parson2 and X.-G. Chen1
1 NSERC/Rio Tinto Alcan Industrial Research Chair in Metallurgy
of Aluminium Transformation, Université du Québec à Chicoutimi
2 Arvida Research and Development Centre, Rio Tinto Alcan,
Saguenay (QC), Canada

1. INTRODUCTION

2. OBJECTIVES

1xxx series aluminum alloys are used in a wide range of applications where excellent formability,
corrosion resistance and electrical and thermal conductivity are desirable such as foil and strip for
packaging and heat-exchanger tubing. Typically, the levels of iron and silicon in a specific alloy are
controlled to give the required performance such as strength and formability. An alternate approach
to gain strength is to add alloying elements such as manganese and copper for solution
strengthening. The purpose of this study is to assess the impact of Mn and Cu additions on hot
workability of commercially pure aluminum with the long term view of optimizing 1xxx alloy design
for strength and hot processability.

Al-0.1Fe-0.05Cu
Al-0.1Fe-0.15Cu
Al-0.1Fe-0.3Cu
Al-0.5Fe(B0)
Al-0.5Fe-0.1Mn
Al-0.5Fe-0.2Mn

Fe

Si

Cu

Mn

Ti

0.12 0.10 0.002 0.001 0.016
0.13 0.11 0.003 0.11 0.015
0.13 0.11 0.003 0.21 0.014
0.12 0.10
0.13 0.11
0.13 0.11

0.05
0.18
0.31

 investigating the effects of Mn and Cu additions
on microstructural evolution and softening
behaviors of dilute Al-Fe-Si Alloys during hot
compression processes.

3. EXPERIMENTAL PROCEDURES

Table 1. Chemical composition of the prepared alloys.
Alloy
Al-0.1Fe(A0)
Al-0.1Fe-0.1Mn
Al-0.1Fe-0.2Mn

Studying hot compression behavior of dilute Al-FeSi alloys containing various Mn (0.1 and 0.2 wt.%)
and Cu (0.05, 0.18 and 0.3 wt.%) contents.

Casting
 Melting : 750oC
 0.015 Ti
 Steel mold

Homogenization
 T: 550oC
 Time: 6h
 Water quench

Hot compression test
 T: 400-550oC
 Strain rate: 0.01-10 s-1
 Strain: 0.8

Microstructure
characterization
 SEM-EBSD
 TEM

0.001 0.016
0.001 0.015
0.001 0.015

0.49 0.10 0.004 0.002 0.017
0.50 0.11 0.003 0.11 0.014
0.50 0.11 0.003 0.22 0.015

Flow stress behavior

4. RESULTES
Constitutive analysis

Microstructural evolution during hot deformation

Hyperbolic-sine equation

  A[sinh( )]n exp(

Q
)
RT

PRIX // AWARD

Activation energy

   ln[sinh( )] 

 ln 
Q  R
  RnS
 
 (1 / T )
 
  ln[sinh( )]  T 

Fig.1. Typical true stress-strain curve of (a) Al0.1Fe, (b) Al-0.1Fe-0.3Cu, (c) Al-0.1Fe-0.2Mn
and (d) Al-0.5Fe-0.2Mn.
Fig.3. Activation energy of different alloys
as a function of alloying addition.

Fig.2. Effect of Mn and Cu on the flow stress of
different alloys at