MMC-rajdeep NIT Warangal

8/6/2019 MMC-rajdeep NIT Warangal

http://slidepdf.com/reader/full/mmc-rajdeep-nit-warangal 1/33

National Institute Of Technology,

WarangalMETAL MATRIX COMPOSITE

Presented By:

Raj Deep Gupta

103405Materials Technology

M.Tech (1st)



C mp site Materials

� T e term c mp site i t e c mp site material

sig ifies t at tw r m re materials are

c mbi ed a macr sc pic scale t f rm a

sef l t ird material.



INTRODUCTION

MMC(METAL MATRIX COMPOSITES)T ese are t e materials i w ic a metallic base material is rei f rced wit

typically a ceramic fibre,w isker r partic late.

MMCs are differ fr m CMCs a d PMCs

Differe ces exist wit respect t

T e at re a d type f c stit e ts

T e c s lidati a d pr cessi g appr c es.

Pr perty attrib tes a d t eir liabilities.



Types of MMCs

� C ti s fibre rei f rced MMCs

Ex- SiC fibre i Ti matrix

C pped fibre rei f rced MMCsEx- al mi a fibres i Al,Mg matrix

w isker rei f rced MMCs

Ex-SiC particles i Al matrix



Types



Charactersrics of MMCs

� Hig specific stre gt

� Hig specific m d l s

� Impr ved wear resista ce� L w c efficie t f t ermal expa si

� Impr ved elevated temperat re stre gt

� G d fatig e resista ce

� Impr ved dampi g capacity



T ermal Expa si s f MMCs



Tail rability f MMCs

It is p ssible t ac ieve specific stiff ess f steel

/expa si c efficie t f Be/wear resista ce

f CI/dampi g capacity f C M all y i Al

matrix c mp sites by appr priate selecti f

matrix a d rei f rceme t.



Tali rability f Al MMCs

property Aluminium /alloy Al MMC

UTS 350 MPa Up t 700 MPa

YS 300 Mpa Up t 680 MpaDampi g capacity 1% 8%

Fatig e resista ce a d creep resista ce pr perties als g d f r MMCs



Be efits f MMCs

1.C st be efits MMCs s bstit tes expe sive

materials s c as s per all ys, Be all ys.

2.Perf rma ce be efits(pr d ctivityimpr veme t)

Ex- Al MMCs i raci g bicycles

3. E vir me tal be efitsEx- ca red ce ise pr d ce by a t m biles



MMC Systems

Matrix Reinforcement Type of reinforcement

Al,C ,steel,Mg, i,Ti,

Tita i m al mi idesa d ickel

al mi ides

SiC,Al2 3,TiB2, B4C,

Grap ite

Particles,s rt

fibres,c ti sfibres,Hollow

Sp eres a d

platelets



MMCs are ma fact red bot i cast a d

wroug t f orms.

�

I cast f o

rm t ese are made i to

products/components and also Billets/Ingots.

Currently billets up to 250 kg are

manufactured.

� In wroug t f orm MMC are available in f orm of

Extrusion,S eets and Plates.



Manufacturing Processes

� Solid state processes

� Liquid state processes

Factors used in selection of manufacturing

1. Maintenance of reinf orcement strengt2. Minimization of reinf orcement damage

3. Promotion of wetting and bonding between t ematrix and reinf orcement

4. Ability to ac ieve t e spacing and orientation of reinf orcement wit in matrix.

5. cost



Solid state processes

a)Powder blending and consolidation:steps

� in t is process, powders of t e metallic matrix andreinf orcement are first blended and fed in to mould of desired s ape.

� pressure is applied(cold pressing).

� T e compact is t en eated to temperature w ic is belowmelting point.

� Mixture can also be consolidate directly by ot pressing.

� T e consolidate composite is t en available f or secondaryprocessing



b) Diff usion Bonding



c)Vapour deposition:

� T is procees involves continuous passage of

fibre t roug a region of ig partial vapour

pressure of t e metal to be deposited, w ere

condensation takes place so as to produce a

relatively t ick coating on t e fibre.

(vapou

r is pro

du

ced by electron

beamo

r p ysical vapou

r depo

sition

)

ADVANTAGE w ide range of alloy compositions can be used.



Liquid state processes

� Dispersion process(stir casting):

T e reinf orcement is incorporated in loose f orm in to t e metal

matrix. T e simplest dispersion process in current use is t evortex met od, w ic consist of stirring of t e liquid metal

and t e addition of particles/w iskers/s ort fibers in t e

vortex.

Used f or manufacturing of cast MMCs reinf orced wit SiC, Al2 3,and ot e ceramic reinf orcements



b) Spray deposition:

Stream of metal droplets impinges on a substrate in suc a way

as to build up a composite.

It is of 2 types1)Droplet steam is produced by molten bat (Ex-osprey process)

2)Continuous feeding of cold metal in to a zone of rapid eat

in jection(t ermal spray process)



In situ fabrication tec nique

� Controlled unidirectional solidification of a

eutectic alloy can result in a two-p ase

microstructure wit one of t e p ases,

present in lamellar or fiber f orm, distributed in

t e matrix.



Secondary Processes

Some MMCs are subjected to secondary

processes f or t e f ollowing purposes::

a)T

oelimi

nate p

oro

city an

d enh

an

cedensification.

b)To achieve fibre alignment

c)T

o

impro

ve distribu

tion

o

f rein

f o

rcemen

t



Current application of MMCs

Aerospace

Defence

AutomotiveThermal management

Industrial



Aerospace

� A)Engine components: Good creep resistance,high specific stiff ness and resistance againstf oreign object damage are some of important

requirements f or aero engine components.Al & Ti matrics are currently being used f or

a variety of engine components.

Cu

MMC pu

mp mo

to

rhou

sin

g is bein

gu

sedbecause of excellent compatibility with oxygen combustion.



� B)Aerospace structures: high specific strength,high specific modulus, good elevatedtemperature strength and adequate fracture

toughness.these attributes are required in

application in application such as struts,access doors, wing, frame, stiff ner and floorbeam.

Al MMC are used f or structures.

� B)Aerospace structures: high specific strength,high specific modulus, good elevatedtemperature strength and adequate fracture

toughness.these attributes are required in

application in application such as struts,access doors, wing, frame, stiff ner and floorbeam.

Al MMC are used f or structures.



C).Satellite and space structures: High specific

stiff ness, controlled thermal expansion

coefficient and thermal cycling stability are

the requirements.

MMCs are in use in high gain antenna

mast and in platf orm space station.

Graphite fibre reinf orced Mg MMCs in

the f orm of thin walled tubes are used.



Defense applications

� MMCs are used in Ground, avy, Air Deffence

applications.

Al MMCsu

sed as track sho

eo

f tan

ks becau

seo

f 1: 30% reduction in weight compared to steel

track shoe

2: better du

rability3: Improved abrasion resistance



Automotive applications

� MMCs reduced vehicle emmisions

� Increase comf ort and styling options

� Improve f uel economy

� Enhanced perf ormanceMMCs are used in

1: Brake discs/brake drums

2: Cylinder liners

3: Drive shaft

4:Push rods



Industrial applications

� Fly wheel f or Energy storage

� Retainer rings f or high speed motors

�ptical gimbal mount f or an IR Missile seeker



MMCs in f uture technologies

� MMCs are usef ul f or high productivity, higherperf ormance, light weight devices and cleanerenvironment.

�

MMCs1. ill enable f uture production f or light weight mass

transportation vehicles(trucks,trains)

2. ill enable manufacturing of next genration gas turbineengines having significantly improved thrust to weightratio and reduced f uel consumption

3. ill enhance payload capacity f uture space vehicles



Conclusion

� MMCs are only class of materials with broad

range of properties and having high merit

index f or almost every application. MMCs

have now overcome most of the technical

barriers and are reaching out both high tech

and mass markets .



References

� ^Materials science and Engineering, an introduction.illiam D. Callister Jr, 7th Ed, iley and sons

publishing

� Materials research:current scenario and f uture

pro jection------------Metal matrix composite by M.K.Surappa

(IISc Bangalore)

� ^ Ratti, A.; R. Gough, M. Hoff, R. Keller, K. Kennedy, R

MacGill, J. Staples (1999). "The S S RFQ PrototypeModule". P article Accelerator Conference, 1999. 2 (1):884886.doi:10.1109/PAC.1999.795388. ISB 0-7803-5573-3.

MMC-rajdeep NIT Warangal

Documents

Transcript of MMC-rajdeep NIT Warangal