碳化硅增强铝基复合材料的力学性能和断裂机制

2

Vol.23No.2April2009

2009

4

CHINESEJOURNALOFMATERIALSRESEARCH

1

1,2

1

1

1.2.

110016

110004

(SiCp)

15%

SiCp/2009

.

,

SiCp

,

.

SiCp,

1.5µm

,SiCp/2009AlSiCp

;

SiCp

20µm

;,

SiCp

,SiCp/2009Al

,

SiCp

.

,

,

,

TB331

1005-3093(2009)02-0211-04

EffectsofSiCparticlesizeontensilepropertyandfracture

behavioronparticlereinforcedaluminummetal

matrixcomposites

JINPeng1

LIUYue1,2

LIShu1

XIAOBolv1∗

1.InstituteofMetalResearch,TheChineseAcademyofSciences,Shenyang1100162.SchoolofMaterialandMetallurgy,NortheasternUniversity,Shenyang110004

ManuscriptreceivedNovember20,2008;inrevisedformJanuary8,2009.

*Towhomcorrespondenceshouldbeaddressed,Tel:(024)83978630,E–mail:blxiao@imr.ac.cn

ABSTRACTInthispaperthetensilepropertiesandfracturebehaviourofaluminumalloy2009rein-forcedwithsiliconcarbideparticulates(SiCp)fabricatedviaelementalpowdermetallurgicaltechniquewerepresented.Theresultsindicatethatthestrengthof15%SiC/2009Alcompositedecreasewithincreasingparticulatessize,butductilityinversely.Whenparticulateswere1.5μm,thebreakageisduetotearingofmatrixnearinterface.Thefailureofcompositeswith20μmparticulateresultsfromcrackofSiCp.Whenparticulatesarebetweenabovesizes,thefailureofcompositeresultsfromtearingofmatrixnearinterfaceandcrackofSiCp.

KEYWORDScomposites,aluminummatrixcomposites,particlesize,powdermetallurgical,mechan-icalproperty,fracturemechanismSiC

[8]

[9]

[10,11]

.,

(SiCp/Al)

,

.

,

SiCp/A1

.

Al4C3[12],

[1−4]

.

SiCp/A1

[13]

,

SiCp/Al

.

,

.SiCp/Al

[7]

[5,6]

.

SiCp

,

.

2008

11

20

;2009

1

8

.

:

1

2009

(

,

212

%):Cu3.7,Mg1.3,

23

Al,

α–SiCp

,SiCp

1.5μm3.5μm7μm

20μm.

(

2b).

SiCp/2009Al

1

,

,SiC

15%.

480

SiCp

,

16mm

,

10:1,

SiCp

,

20μmSiCp

495

1h,

96h.

.

5mm

25mm

SiCp

,

.

.

,,

,

SiCp

.

(HITACHIS-3400N)20μmSiCp

,

(TECNAIG220)

.

.

2

:(1)

,

1.5μm

Cu

Mg

.(2)

3.5μm

SiCp

,

SiCp

1

.,

.

,3.5μmSiCp

1.5μmSiC,

,

ρ[14]

p

1.5μmSiCp

Vf

SiCp

.

ρ=12ΔTΔC3.5μmSiCp

bd

,SiC

(

2a),

ΔT

,ΔC

SiCp

,

,Vf

d

SiCp

.

.

1SiCp/2009Al

Fig.1MicrostructureoftheSiCp/2009Alcomposite(a)1.5µmand(b)3.5µm

23.5µmSiCp

TEM

Fig.2TEMimagesof3.5µmSiCpreinforcedcomposite(a)SiC/2009Alinterfaceand(b)dislocations

ataggregation

(1)

,b

2

:

213

1

SiCp

SiCp/2009Al

3(a)

1.5μmSiCp

,

.

Table1ThemechanicalpropertiesofSiCp/2009Al

compositesfordifferentparticulatesizes

Particlesize,μm

1.53.57202009Al

σ0.2/MPa430361351343325

σb/MPa631951484

σ5/%5.08.08.58.817.0

,1.5μmSiCp

,

(

3a

).(

3.5μmSiCp

7μmSiCp

,

,

3b

c).7μmSiCp

SiCp

.20μmSiCp

SiC

,

Δσ=αGb(ρ)1/2

[15]

(2)

(2)

(

3d),

(

2)

,SiC

.

α

,

.

,

SiCp

G

(GPa),bSiCp(1)

20μm

,ρ

SiCp

.

SiCp

.

,

SiCp

,

,SiCp

,

,

.

.

,

,

,SiCp

SiCp

,

1.5μmSiCp

.,

SiCp

,

,

SiCp

SiCp

,

,

SiCp

,

,

,

.

,

.

[16]

3

SiCp

Fig.3Fractographyofdifferentparticlesizereinforcedaluminummatrixcomposites(a)1.5µm,(b)

3.5µm,(c)7µmand(d)20µm

214

2SiC

Table2SurfaceEDSresultsofSiCp

Particlesize/μm

Al,countsSi,counts3.52300160020

400

3300

.

,

,

,

,

,

,

.

.

3

15%

SiCp

2009Al

,SiCp

1.5–20μm

p

,SiC.

SiCp

,

,

.

SiCp

1.5μm

430MPa

631MPa.SiCp

SiCp/2009Al

.SiCp

20μm

,

SiCp

,SiCp

3.5μm

7μm

,

SiCp

.SiCp

1.5μm

,

,

.

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