aluminum alloys 2xxx and 7xxx series
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7/18/2019 Aluminum Alloys 2xxx and 7xxx Series
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Dokuz Eylül University
Faculty of Engineering
Department of Metallurgical and Materials Engineering
Materials Characterization
Laboratory eport
!LUM"#UM !LL$%&' ())) and *))) &eries
+, -eat .reatment !pplied ())) and *))) !luminum !lloys &eries
Copper rate is high in 2xxx aluminum alloys; Zinc rate is high in 7xxx aluminum alloys. [1]
.able +' The content of the aluminum alloys. [2]
!lloy &i /01
Fe
/01
Cu
/01
Mn
/01
Mg
/01 Cr /01 2n /01
.i
/01
$thers
/01 !l /01
2011 0.40
0.7
0 .0!".0 ! ! ! 0.#0 ! 0.1 $emaine%
2014 0.!1.2
1.0
0 #.&!.0 0.4!1.2 0.2!0.' 0.1 0.2 0.1 0.1 $emaine%
2024 0.
0.
0 #.'!4.& 0.#!0.& 1.2!1.' 0.1 0.2 ! 0.1 $emaine%
7001 0.#
0.4
0 1."!2." 0.20 2."!#.4 0.1'!0.40 ".'!'.0 0.20 0.1 $emaine%
707 0.
0.7
0 1.2!2.0 0.#0 2.1!2.& 0.1'!0.40 .1!".1 0.20 0.1 $emaine%
707& 0.#
0.4
0 0.4!0.' 0.1!0.# 2.&!#.7 0.10!0.2 #.'!4.' 0.10 0.1 $emaine%
717' 0.
0.7
0 1."!2.4 0.#0 2.4!#.1 0.1'!0.4 ".#!7.# 0.10 0.1 $emaine%
(eat treatment applies in 2xxx an% 7xxx aluminum alloys. (eat treatment increases strength. )pplie%
heat treatments are *uench annealing an% ageing. +uench annealing process is ,no-n as cooling process. )geing process is ,no-n as precipitation process. [1]
(, !pplication of .3 -eat .reatment in *4*5 !luminum !lloys
irstly/ heat treatment is applie%. Then artificial ageing is applie%. This calle% is T".
1
7/18/2019 Aluminum Alloys 2xxx and 7xxx Series
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.able (' 707 )luminum alloys the heat treatment alues. [1]
6aiting
.emperature
/oC1
6aiting .ime
nforge% minute3 orge% hour3thic,ness thic,ness
%o-n to '
mm
' #2
mm
#2 "4
mm
up to "4
mm
%o-n to 0
mm
up to 0
mm4"0 47 20 #0 40 "0 5 ! " 2 ! 12
.able 7' 707 )luminum alloys the ageing alues. [1]
!geing .emperature /oC1 !geing .ime /hour1
120 12 24
.able 8' )luminum alloys after the heat treatment alues. [1]
&oftening Cold .reatment Eradication
6aiting
.emperature /oC1
6aiting
.ime /hour1
Cooling
ate
6aiting
.emperature /oC1
6aiting .ime
/hour1
Cooling
ate
# #70 2 C # #70 2 C
C6 aterial is coole% to 2#oC in the air. 8t is incu9ate% for 4 hours in 2# oC. :ater/ the material is
coole% to room temperature.
7, Corrosion 9roperties of *4*5 !luminum !lloy
The corrosion resistance of aluminum is relatiely high. This feature also applies to the 707
aluminum alloy. enerally/ aluminum forms a protectie layer on the material. <rotectie layer is
imperious to the effects of corrosion insi%e the material. (o-eer/ the resulting protectie layer -ears/
corrosion can 9e effectie.
8, Mechanical 9roperties of *4*5 !luminum !lloy
(ar%ness an% strength increase the material as a result of heat treatment.
.able 5' The mechanical properties of 707 aluminum alloy. [1]
!lloy
and
.ensile &trength :rinell
-ardness
Modulus
of =trength >longation 0 mm3
Tensile ?iel% thic,ness %iameter/
2
7/18/2019 Aluminum Alloys 2xxx and 7xxx Series
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=trength
,g@mm23
=tress
,g@mm23
/ # mm
A3
12 mm
A3
707 0 2#.1 10. 17 1" "0 7.# x 10#707 T" 7.4 0.4 11 11 10
5, $ptical Microscopy "mages of *4*5 !luminum !lloy
Figure +' icrostructure of the semisoli% 707 )l alloy %uring remelting -ith the hol%ing time of 10
min at the isothermal temperatures of a3 "0/ 93 70/ c3 '0/ %3 &0/ e3 "00/ an% f3 "10BC. [#]
#
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Figure (' ) comparison 9et-een the micrographs 10003 of )l 707!T" at 0oC for %ifferent aging
%urations. [4]
Figure 7' icrostructures of some specimens after 1" hours aging at %ifferent temperatures. [4]
EFEE#CE&'
4
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[1] >$=D>$/ )$)/ )lEminyum )laFGmlarGnGn 8sGl e e,ani, HFlemleri/ 1. printing/ 8Imir
<u9lications/ 8stan9ul/ Tur,ey/ 1&"0/ pp. 1!'#.
[2] JHKL>MK:/ )CHT/ etal )laFGmlarGnGn 8sGl HFlemleri/ 1. printing/ )n,ara/ Tur,ey/ 1&72/
pp. 4!4#.[#] M())L8 (./ N>T)OC(8/ ./ POac,-ar% extrusion of 707 )l alloy in the semisoli%
stateQ/ 8nternational Rournal of Chemistry an% aterial =cience/ 7 13/ pp. 1'2!1''/ 201#.
[4] )RZMMO8/ .(./ =MM$8/ ./ Pretting an% plain fatigue 9ehaior of )l 707!T"1 at eleate%
temperaturesQ/ Rournal of >ngineering Tri9ology/ 227 123/ pp. 1#'"!1#&'/ 201#.
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