ENCYCLOPÉDIE DE LA RECHERCHE SUR L’ALUMINIUM AU QUÉBEC 2013 | Page 53
NOUVEAUX PRODUITS ET MATÉRIAUX À BASE D'ALUMINIUM
NEW ALUMINIUM BASED PRODUCTS AND MATERIALS
The Effect of Mg and Si on Properties and
EFFET DEMicrostructure of 3xxx Al Alloys LES PROPRIÉTÉS DES ALLIAGES AA3XXX
Mg ET Si SUR LA MICROSTRUCTURE ET
THE
Effet de Mg et Si sur la Microstructure et
EFFECTles PropriétésSi ON PROPERTIES AND
OF Mg AND des alliages AA3xxx
51
MICROSTRUCTURE OF AA3XXX ALLOYS
Zhen Li, Zhan Zhang, X.-Grant Chen
NSERC/Rio Tinto Alcan Industrial Research Chair
in Metallurgy of Aluminum Transformation, UQAC
1. INTRODUCTION
2. OBJECTIVES
In this study, the effect of Mg and Si on properties and
To understand the effect of Mg and Si on properties and
microstructure of Al-Mn alloys (3xxx) is investigated. Four
microstructure
experimental alloys were designed to evaluate the influence of Mg
1. the effect on hardness
and Si on microstructure, electrical conductivity, and hardness on
2. the effect on electrical conductivity
different heat treatment conditions.
3. the effect on dispersoids particles
3. EXPERIMENTAL PROCEDURE
1. Casting
2.Heat treatment
Table 1 Chemical composition of
the alloys used in this experiment
Table 2 Heat treatment
conditions
Element
Alloys
Si
Fe
Mn
Mg
Al
D1
0.28
0.52
1.19
1.06
Bal
D2
0.27
0.60
1.21
1.72
Bal
D3
0.50
0.56
1.22
1.11
Bal
D4
0.52
0.60
1.20
1.79
Bal
Temperature(
℃)
5. Microstructure observation
3. Hardness measurement
Micro-hardness was measured by
Vickers hardness tester. The load
Holding time(h)
was 2.94N, holding time was 20s.
360℃
2
6
12
24
48
385℃
2
6
12
24
48
425℃
2
6
12
24
48
4.Electrical conductivity
measurement
4. RESULTS
360℃
66
64
Vicker hardness(kg/mm )
Hardness
62
2
2
Vicker hardness(kg/mm )
64
60
58
56
54
52
50
48
D1
D2
D3
D4
66
64
62
2
66
60
58
56
54
52
10
20
30
40
50
48
62
60
58
56
D1
D2
D3
D4
54
52
50
50
0
1. Magnesium has positive effect on
materials’ strength, but the effect of Si
on the strength is limited.
2. The microstructure of the
experimental alloys is consisted of
Al6(Mn,Fe), α-Al(Mn,Fe)Si, Mg2Si and
aluminum matrix.
3. Heat treatment conditions have strong
influence on the properties of the alloys.
68
68
D1
D2
D3
D4
Vicker hardness(kg/mm )
68
5. CONCLUSION
425℃
385℃
48
0
20
30
40
50
0
10
20
30
40
Time(h)
Time(h)
Electrical conductivity
Time(h)
10
50
�
6. FUTURE WORK
1. Quantify the effect of Mg and Si on
volume fraction of the phase particles in
the alloys
2. Clarify the effect of Mg on nucleation
of α-Al(Mn,Fe)Si dispersoids.
3. Develop heat treatment to get
desirable microstructure.
Fig. 1 The hardness and electrical conductivity of the samples under different condition of heat-treatment
(b)
(a)
(c)
Microstructure
Primary Mg2Si
(d)
Zhen Li
Zhan Zhang
X.-Grant Chen
Chaire industrielle
de recherche
CRSNG/Rio Tinto Alcan
sur les nouvelles avenues en
métallurgie de la
transformation de l’aluminium
(CIMTAL),
Université du Québec
à Chicoutimi
α-Al(Mn,Fe)Si
Second phase Mg2Si
Al6(Mn, Fe)
Fig. 2 (a) Optical image of D2 alloys after heating at 360℃ for 6hours (b) SEM image of D2 alloys after heating at 360℃ for 6hours (C) Optical image of D2 alloys after heating at 425℃ for 48h (d) TEM image of D2 alloys after heating at 425℃ for 48h
Journée des étudiants – REGAL
Dans la présente étude, quatre alliages expérimentaux avec différentes
In the present study, four experimental alloys with different concentrations of Mg
Palais des dans le but d’examiner l'effet de Mg
concentrations de Mg et Si ont été étudiés, congrès de Montréal, QC, Canada, 22 octobre 2013 Si were investigated to examine the effect of Mg and Si on the properties and
and
et Si sur les propriétés et la microstructure des alliages Al-Mn (3xxx). Ces alliages
microstructure of Al-Mn (3xxx) alloys. These alloys were heat-treated at 360°C,
ont subi un traitement thermique à 360°C, 385°C et 425°C respectivement, pour
385°C and 425°C respectively for different holding times. The micro-hardness,
différents temps de maintien. La micro-dureté, la conductivité électrique et la
electrical conductivity and microstructure of th