aluminum alloys 2xxx and 7xxx series

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



.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



=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. [#]

#



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



[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#.

aluminum alloys 2xxx and 7xxx series

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