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8/10/2019 Mechanical Behavior Of Al 6063/ Mos2/ Al2o3 Hybrid Metal Matrix Composites
1/4
International Journal of Scientific and Research Publications, Volume 4, Issue 12, December 2014 1
ISSN 2250!15!
Mechanical Behavior Of Al 6063/ Mos2/ Al2o3Hybrid
Metal Matrix Composites
Mitesh Kmar1! Asho" Kmar Mishra2
1"#$ech in "anufacturin% $echnolo%& ' (utomation, )#R#*#" *+$, )ahal2(ssociate Professor ' -D, "echanical +n%ineerin% De.artment, )#R#*#" *+$, )ahal
Abstract# In the .resent in/esti%ation research or is based on de/elo.ment of (l 0! base h&brid metal matri3
com.osite reinforced ith 10 ei%ht .ercenta%e of (luminium -3ide (l2-!, and /ar&in% ei%ht .ercenta%e of "ol&bdenum
disul.hide i#e# !6, 56, 76 ' 86# $he com.osite as .re.ared b& usin% stir castin% techni9ue# $he densit& of (l 0!: "oS2:
(l2-! ere increasin% hen reinforcement of "oS2 increases from !6 to 86# $he ;ltimate $ensile Stren%th decreasin% due to the
additions of !6 to 86 of "oS2 and also reinforced ith alumina (l2-! into the base matri3# It as seen that hile the (l 0!
allo&s shos the .re dominantl& ductile fracture base matri3# $he com.osite s.ecimens ith a "oS2 addition sho an increase in
the mi3ed mode ductile and brittle re%ions# In/esti%ation also .redicts that hardness increases due to /ar&in% addition of "oS2#
"icro%ra.hs of the com.osite s.ecimen are taen for the stud& of .articular or o/erall beha/iour of the material#
1# IN$R-D;*$I-N
(luminium silicon allo&s and com.osites are bein% used in automoti/e a..lications lie .istons, brae rotors and en%ine
bloc c&linder liners#$ribolo%ical beha/iour is an im.ortant as.ect in the use of aluminium metal matri3 com.osites in automoti/e
a..lications# $he ear beha/iour of (lSi allo&s can be further enhanced b& addin% ceramic .articles# (brasi/e .articles lie silicon
carbide, alumina, and diamond are added to im.ro/e the tribolo%ical beha/iour b& increasin% the hardness of a com.osite#
Ne/ertheless, lubricatin% .articles lie %ra.hite and "oS2ha/e also been added to im.ro/e the tribolo%ical beha/iour of different
materials b& .ro/idin% a solid lubricatin% la&er# $he additions of these .articles considerabl& affect the mechanical beha/iour of the
com.osites#
$here are /arious methods of .roducin% com.osites lie blendin% and consolidation, /a.or de.osition and consolidation, stircastin%, infiltration .rocess, s.ra& de.osition and consolidation, as ell as insitu reactin% .rocess# -f all these .rocesses, stir castin%is the sim.lest and the most economical method# Selflubricatin% (l"oS 2com.osites ha/e been .re.ared b& usin% the .odermetallur%& route# In this in/esti%ation, four selflubricatin% com.osites of mol&bdenum disul.hide, namel&, (l 0! : !6 "oS 2: 106
(l2-!, (l 0! : 56 "oS2: 106 (l2-!, (l 0! : 76 "oS2: 106 (l2-!and (l 0! : 86 "oS 2: 106 (l2-!ha/e been .roducedith the stircastin% route# $he chan%es in the mechanical and tribolo%ical .ro.erties caused b& the addition of "oS2are studied#
2# D+$(IP+RI"+N$
$%& Materials
(l 0! as used as the matri3, alumina as hard reinforcement and mol&bdenum disulfide as soft reinforcement# $his matri3
allo& as used for intricate, thinalled castin%s that demand hi%h stren%th, such as castin%s for the automoti/e industr& and %eneral
en%ineerin%#
'able & Chemical (roperties of Al 6063
Component "n =e "% Si ?n $i *r *u -thers
)ei*ht + 0#0 0#0 0#45 0#20 0#0 0#0 0#0 0#0 0#0
0#10 0#!5 0#80 0#0 0#10 0#10 0#10 0#10 0#15
It has /er& %ood castabilit& and is suitable for sand, %ra/it& diecastin%, and hi%h.ressure die castin%# $o .roduce com.osites, the
stir castin% techni9ue as used# Particle si@e of 400 micron alumina and 400 micron .article si@es of mol&bdenum disulfide
reinforcements ere used in this com.osite# "ol&bdenum disulfide in /ar&in% amounts ran%in% beteen !6, 56, 76, and 8 t# 6
as mi3ed ith (l 0! and 10 t# 6 alumina com.osite# $he densities of the com.osites ere measured usin% (rchimedes
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International Journal of Scientific and Research Publications, Volume 4, Issue 12, December 2014 2
ISSN 2250!15!
.rinci.le# $he ei%ht of the com.osite sam.les as measured ith the hel. of an electronic balance#
$%$ (reparation of the composite
=irst of all sand mould is .re.ared# $he four main com.onents for main% a sand castin% mold is base sand, a binder,
additi/es, and a .artin% com.ound# In this castin% .rocess a .attern is made in the sha.e of the desired .art i#e# c&linder# $his .attern
is made of metal# Stir castin% techni9ue is used for the .re.aration of material# $his a..roach in/ol/es mechanical mi3in% of the
reinforcement .articulate into a molten metal bath and transferred the mi3ture directl& to a sha.ed mould .rior to com.lete
solidification# (fter the meltin% of material .ourin% is accom.lished ith %ra/it *ast in%ot surface is clean b& machinin% .rocess#
$%3 'estin* of materials
$he densit& of metal matri3 com.osites as determined b& (rchimedes .rinci.le# $he microstructure of the com.osite
s.ecimens as identified usin% an o.tical microsco.e# =irst of all rou%h %rindin% of s.ecimen as done usin% emer& .a.ers of
different %rades# (fter the rou%h %rindin% fine .olishin% of the s.ecimen as done# $his .olishin% as done to remo/e fine scratches
of s.ecimen# =or this .ur.ose to different %rades of .olishin% .oder ere used of si@e 0#017Am and 0#014 Am# +tchin% of the
s.ecimen as done to remo/e an& surface contamination and to re/eal the %rain boundaries# $he tensile stren%th testin% as carried
out usin% uni/ersal testin% machine# $he ultimate tensile stren%th of the s.ecimen as calculated from the load at hich a fracture
occurred# $he hardness testin% as carried out usin% /icers hardness machine# $he hardness of the s.ecimen is defined as the load
di/ided b& the surface area of the indentation#
'able $ "echanical .ro.ert& of "etal "atri3 *om.osites
"etal "atri3 ;$S Densit& ardness Decrease in Increase in Increase in
*om.osites N:mm2 %:mm! ) ;$S, 6 Densit&, 6 ardness, 6
(l 0! : !6 72#41 2B0 !#2
"oS2: 106 (l2-!
(l 0! : 56 7#45 2B80 !#! #B5 1#05 0#27
"oS2: 106 (l2-!
(l 0! : 76 5#4B 28!0 !# 1#2 1#!B 0#B!
"oS2: 106 (l2-!
(l 0! : 86 25#0 2870 !7#1 5#4 1#! 1#!7
"oS2: 106 (l2-!
!# R+S;
8/10/2019 Mechanical Behavior Of Al 6063/ Mos2/ Al2o3 Hybrid Metal Matrix Composites
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International Journal of Scientific and Research Publications, Volume 4, Issue 12, December 2014 !
ISSN 2250!15!
,i*re & (l 0! C!6 "oS2C 106 (l2-! ,i*re $ (l 0! C56 "oS2C 106 (l2-!
,i*re 3 (l 0! C76 "oS2C 106 (l2-! ,i*re - (l 0! C86 "oS2C 106 (l2-!
3%$ Mechanical (roperties
$he mechanical .ro.erties of the com.osites densit&, hardness and tensile stren%th, %i/en in $able 2# Shos the a/era%e
.ro.erties of /arious test s.ecimens at different com.osition#
$he densit& of "ol&bdenum disulfide "oS2 is hi%her than that of the aluminium allo& and hence an increase in the"ol&bdenum disulfide "oS2 content ill raise the densit& of the com.osite# $he densities of increase in "ol&bdenum disulfidefrom !6 to 86 ere mar%inall& hi%her than the densit& of the aluminium allo& b& 1 6 and 2 6 res.ecti/el
$he tensile stren%th decreases considerabl& due to the additions "ol&bdenum disulfide "oS 2 from !6 to 86 b&mass# $he obser/ed decrease in ;$S ma& be due to /arious mechanisms lie the .article .ullout and crac .ro.a%ation, hich areinitiated b& the .resence of "oS2#
$he hardness increases considerabl& due to the additions "ol&bdenum disulfide "oS 2 from !6 to 86 b& mass#$his is due to an increase in the .ro.ortion of the hard .articulates in the com.osites, hich increases the com.osites resistance toindentation in com.arison to the monolithic allo
-% CO.C12O.1
In this research or, (l 0!: "oS2: (l2-!com.osites are fabricated usin% the stircastin% techni9ue and the mechanical
beha/iour of the metal matri3 com.osites ere studied# $he folloin% im.ortant obser/ations can be noted
1# Vicers hardness of (l 0! ith mol&bdenum disul.hide "oS2, (lumina (l2-! and "a%nesium "etal "atri3 *om.osites
""*s are increases hen increasin% the ei%ht .ercenta%e of "ol&bdenum disul.hide#
2# Densit& of (l 0! ith mol&bdenum disul.hide "oS2, (lumina (l2-! and "a%nesium "etal "atri3 *om.osites ""*s are
increases hen increasin% the ei%ht .ercenta%e of "ol&bdenum disul.hide#
!# ;ltimate tensile stren%th of (l 0! ith mol&bdenum disul.hide "oS2, (lumina (l2-! and "a%nesium "etal "atri3
*om.osites ""*s are decreases hen increasin% the ei%ht .ercenta%e of "ol&bdenum disul.hide#
4,44.C41
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International Journal of Scientific and Research Publications, Volume 4, Issue 12, December 2014 4
ISSN 2250!15!
1# Vinoth, E# S#, Subramanian, R#, Dharmalin%am, S#, (nanda/el, )#, 2012, F"echanical and tribolo%ical characteristics of stircast(lSi10"% and selflubricatin% (lSi10"%:"oS2com.ositesG "aterials and technolo%&, Vol#4, 5, ..# 487H501#
2# Dharmalin%am, S#, Subramanian, R#, Vinoth, E# Somasundara, and (nanda/el, )#, 2010,
F-.timi@ation of $ribolo%ical Pro.erties in (luminum &brid "etal "atri3 *om.osites ;sin% ra&$a%uchi "ethodG, Journal of"aterials +n%ineerin% and Performance, Volume 20B, ..# 145714#
!# "ishra, (sho Er#, Eumar, Vinod, Sri/asta/a, Raesh Er#, Jul& 2014, F-.timi@ation of $ribolo%ical Performance of (l 01 $156 Si*.156 (l2-!&brid "etal "atri3*om.osites ;sin% $a%uchi "ethod ' re& Relational (nal&sisG Journal of "inerals and"aterials *haracteri@ation and +n%ineerin%, /ol# 2, ..# !51!1#
4# Venatraman, )#, and Sundaraan, #, 2000, F*orrelation beteen the *haracteristics of the "echanicall& "i3ed