Al-6.3Zn-2.8Mg-1.8Cu铸造铝合金的组织和室温力学性能
时间：2025-07-03
Al-6.3Zn-2.8Mg-1.8Cu铸造铝合金的组织和室温力学性能
48
2
Vol.48
No.2
20122
211—219ACTAMETALLURGICASINICAFeb.2012
pp.211–219
Al–6.3Zn–2.8Mg–1.8Cu
(
,
710072)
,
,Al–6.3Zn–(MgZn2)
Al–6.3Zn–2.8Mg–1.8Cu
.
2.8Mg–1.8Cu
,
α(Al)
α(Al)+η(MgZn2)
η
T
(Mg3ZnxCu3 xAl2)
Al7Cu2Fe.
,
η(MgZn2)
,
S
(Al2CuMg).
Al–6.3Zn–2.8Mg–1.8Cu
.
,
,
480MPa
490MPa,
0.2%
2.2%.
,
,
,
,
TG146.1
A
0412 1961(2012)02 0211 09
MICROSTRUCTURESANDROOMTEMPERATURE
MECHANICALPROPERTIESOFAl–6.3Zn–2.8Mg–1.8CuCASTINGALUMINUMALLOY
YANGGuangyu,MENGHongshuai,LIUShaojun,QIYuanhao,JIEWanqi
StateKeyLaboratoryofSolidi cationProcessing,NorthwesternPolytechnicalUniversity,Xi’an710072Correspondent:YANGGuangyu,professor,Tel:13679228998,E-mail:ygy@http://
SupportedbyNationalNaturalScienceFoundationofChina(No.51071129)andNationalBasicRe-searchProgramofChina(No.2011CB610400)
Manuscriptreceived2011–09–15,inrevisedform2011–12–21
ABSTRACTThemicrostructuresandroomtemperaturemechanicalpropertiesofmetal–mold–castingaluminumalloyAl–6.3Zn–2.8Mg–1.8Cuwerestudied.Itwasfoundthatthemicrostructureoftheas–castexperimentalalloyconsistsofnearequiaxedα(Al)matrix,α(Al)+η(MgZn2)eutecticandlittleAl7Cu2Feparticlephase.Thephaseconstitutionofthequenchedexperimentalalloywaschanged,theηphasewasdissolvedintoα(Al)matrixandtendedtodisappear,howeveranewphase,S(Al2CuMg),appeared,whichstillmainlydistributedalongtheα(Al)grainboundary.Theopti-mumsingle–agingprocessparametersweredeterminedbyinvestigatingagehardeningresponseoftheexperimentalalloy.Itwasfoundthatthedouble–agingprocesscouldmakethetensilestrengthoftheexperimentalalloyincreasefrom480MPato490MPa,andtheelongationfrom0.2%to2.2%,comparingwiththesingle–agingprocess.
KEYWORDSaluminumalloy,solutiontreatment,microstructure,agehardening,mechanical
propertyAl–Zn–Mg–Cu
*
,
,
,
,
[1 4]
.
51071129
2011CB610400
,
,
:2011–09–15,
:2011–12–21
,
,
+
:
,
,1967
,
,
[5,6]
.
DOI:10.3724/SP.J.1037.2011.00579Al–Zn–Mg–Cu
,
.
Al-6.3Zn-2.8Mg-1.8Cu铸造铝合金的组织和室温力学性能
212
48
,
.Al–Zn–Mg–Cu
,α(Al)
Zn
Mg
.
400
η
(MgZn2),S
(Al2CuMg)
T(Al2Zn3Mg3)
,
,
[7 10]
[7]
.
,7055
3
(AlCuZn)49Mg32(T
),
(AlCuZn)2 3Mg(η)
Al2CuMg(S),455
,Al
η.Mondal
Mukhopadhyay[8]
,7055
η,T,Sθ
(Al2Cu),
45035h,Cu
T
ZnS.Xie
[9]
7050
Al,ζ–Mg(Al,Cu,Zn)2,S
,θ
,Mg2Si,
Al7Cu2Fe
Al13Fe4
[10]
.Manish,7050
,
,
Al2CuMg,MgZn2,Mg2Si
.[11]
,7050
α(Al)
,α(Al)+Mg(Zn,Cu,Al)2Al7Cu2Fe
,460,
,η
,
,S
η
η
,S
,
,S
.
Al–Zn–Mg–Cu
,
(supersaturatedsolidsolution,SSS)
,
:SSS(α)→GP→η
(MgZn2)→η(MgZn2)→T(Al2Mg3Zn3).
(matrixprecipitates,MPt),
(grainboundaryprecipitates,GBP)
(precipitatefreezone,PFZ),MP,GBPPFZ
,
.
,
GP
η
2
[12 15]
.
Al–Zn–Mg–Cu
,
,
,
,
,
[16,17]
,
,Al–
Zn–Mg–Cu
.
,
,
,
.
,
,
,
,,
.
,
[18]
.,
6%Zn,2.8%Mg,1.9%Cu,0.1%Mn
0.15%Be
Al–Zn–Mg–Cu
,
600MPa,
2%[17,19].
Al–Zn–Mg–Cu
,
.
.
Al–Zn–Mg–Cu
,
.
Al–6.3Zn–2.8Mg–1.8Cu
,
,
,.
1
Al–6.3Zn–2.8Mg–1.8Cu(
,%):Zn6.0—6.5,Mg2.5—3.0,Cu1.5—2.0,Mn
0.1—0.2,Al
.Al–6.3Zn–2.8Mg–1.8Cu
12kg.Al,Zn
Mg,Cu
Mn
Al–50Cu
Al–10MnMg.
,
Al–4Be
0.10%(
)Be.
Al–5TiAl–4Zr
,
,
,720
250
,
12mm,
60mm
.
.
Al–6.3Zn–2.8Mg–
1.8Cu(,%)Zn6.19,Mg2.77,Cu1.78,Mn0.10,Be0.081,Zr0.15,Ti0.14,
Al
.
Al–6.3Zn–2.8Mg–1.8Cu
,±4.,
300
30min,
60—80
,10s.
,
±5
,
3h
.
8mm,10mm
WilsonWor-pertgroupH2588Rockwell
,
980N,
7
,
5
.Al–6.3Zn–
2.8Mg–1.8Cu
Zwick150,
150kN,
2mm/min.
OlympusPM–G3
(OM)
JEOLJSM–5800
(SEM)
.
X’PertPRoMPDX
(XRD)
XRD.
OxfordIncaX
(EDS)
.
(DSC)
Al-6.3Zn-2.8Mg-1.8Cu铸造铝合金的组织和室温力学性能
2
:Al–6.3Zn–2.8Mg–1.8Cu
213
UniversalV4.1DTA,
10/min.Technai30F
(TEM)
,
0.7mm
,
0.1mm
TEM
.
2
2.1Al–6.3Zn–2.8Mg–1.8Cu
1
Al–6.3Zn–2.8Mg–1.8Cu
.
1a,
,α(Al)
;
1Al–6.3Zn–2.8Mg–1.8Cu,
SEMBSE
Fig.1Microstructuresoftheas–castAl–6.3Zn–2.8Mg–
1.8Cualloy
(a)near–equiaxedmicrostructure
(b)SEMimageofsecond–phases(arrowindicatesthe
second–phase)
(c)BSEimageofsecond–phases(arrowindicatesthe
second–phase)
.
1b
,α(Al)
,
,1b
.
1c
BSE
(
),EDS
(,%)
Mg2.72,Al75.61,Mn3.14,Fe4.60,Cu13.92,
Al,Al
Al-6.3Zn-2.8Mg-1.8Cu铸造铝合金的组织和室温力学性能.doc
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