2. ABSTRACT
Was conducted to analyze the effect of temperature
variation on the bonding interface sintered composite Al-
Mg and analyze the effect of variations of the density and
hardness sinter. Research carried out by the base material
powders of Al, Mg powder and solvent n-butanol. The
method used in this study is a powder metallurgy, with a
composition of 60% volume fraction of Al - 40% Mg. Al-
Mg mixing with n-butanol for 1 hour at 500 rpm. Then the
emphasis (cold comression) with a size of 1.4 cm in
diameter dies and height of 2.8 cm, is pressed with a force
of 20 MPa and held for 15 minutes. After the sample into
pellets, then sintered at various temperatures 300 °C,
350 °C, 400 °C and 450 °C.
3. ABSTRACT
Characterization is done by using the testing green density,
sintered density, X-ray diffraction (XRD), Scanning Electron
Microscopy (SEM), vickers microhardness, and press test. XRD
data analysis done by using X'Pert High Score Plus (HSP) to
determine whether there is a new phase is formed. Test results
show that the sintered density increasing sintering temperature,
the resulting density is also increasing (shrinkage). However, at a
temperature of 450 °C decreased (swelling). With the increased
sinter density, interfacial bonding getting Kuta and more
compact so that its hardness is also increased. From the test
results of SEM / EDX, there Mg into Al in the border area. At
temperatures of 300 °C, 350 °C, 400 °C , the phase formed is Al,
Mg and MgO. While phase is formed at a temperature of 450 °C
is aluminum magnesium(Al3Mg2) , Aluminum Magnesium Zinc
(AlMg2Zn).
4. INTRODUCTION
1. Aluminium matrix composites reinforced by Mg,
particles filler are all along one of the research
hotspots of metal matrix composites. By reason that
the wettability between Al and Mg particles is poor at
temperature below 900 °C . Salvo et al
2. consider that in the case of oxidized Mg particles
covered with a layer is of advantage to control the
formation of A14C3. Zhong et al.
5. INTRODUCTION
3. used an oxidation process that the Mg layer was
formed at the surfaces of SiCp particles, which played
an important role in preventing the SiCp from being
attacked by Al matrix. Therefore, one of the
requirements for strong composite is a strong
interfacial bond to permit load to be transferred from
matrix to particles or fibers.
Luo et al.
6. INTRODUCTION
4. investigated the microstructural evolution of brittle
Al–Mg intermetallic compound (IMC) at the bond
interface of Al/Mg/Al multilayer composite sheets
during different sintering conditions, which
demonstrated that the growth rate of the IMC
increased with the increasing sintering temperature,
and no observable IMC was observed at the sintering
temperature of 200 °C or below.
9. METHODS
Materials used in this study was 60 % Aluminium powder
mass , Magnesium 40 % mass and n - butanol . The three
materials are mixed with a magnetic stirrer for 1 hour at 500
rpm . After that, compacting to obtain a pellet diameter of
1.4 cm and 2.8 cm high . Compacting is done by a force of
20 MPa and holding time for 15 minutes . Once formed
pellets , then the next step is vacuum sintering furnace
using argon . Sintering temperature variations used in this
study is 300 ° C , 350 °C , 400 °C and 450 °C , holding time
of 3 hours. Before sintering , conducted pre - sintered at a
temperature of 200 °C , holding time 1 hour . Pre- sintering
is done so that the sample did not shock if exposed to high
temperatures and to eliminate the lubricant that is given at
the time of compaction .
10. METHODS
Characterization of Al - Mg composites using powder
metallurgy method is done by measuring green
density , sintered density , vickers test , X-ray
diffraction and SEM / EDX
18. RESULTS
SEM analysis provides an overview of transpormasi mass
(diffusion) begins with the formation of oxides, the filler
with the color black dot . Diffusion movement starting
material having a low melting point (filler) particles to a
higher melting point (matrix).
Therefore, Al diffusion coefficient is lower than the
activation energy of diffusion of Mg and Mg in the Al lower
due to the lattice structure , the Mg atoms spreads faster
than Al atoms .It appears that the solid solubility in Al- Mg
powder does not occur on the overall powder but only on
the surface contact areas (border areas) only. As was
mentioned above that the purpose of the sintering process
is to increase the bonding interface so that compactibility
of Al - Mg composite material increases.
21. RESULTS
The image above shows that Mg is diffused into the Al
than Al in Mg . This is caused by the melting
temperature of Mg smaller than Al , Mg making it
easier to get into Al . The higher the temperature is
given, the more the magnesium which diffused into
aluminum
22. RESULTS XRD
The diffraction patterns, test analysis using software
High Score Plus (HSP) to determine the phases
formed, to sample the sintering temperature 300 °C,
350 °C and 400 °C consists of Aluminium, magnesium
and periclase (magnesium oxide). The emergence of
these oxides due to the reactive nature of Mg which
reacts with the outside air at the time before and after
sintered. Meanwhile, at a temperature of 450 °C to
form a new phase, namely aluminum magnesium
(Al3Mg2), aluminum (Al) and Aluminum Magnesium
Zinc (AlMg2Zn).
23. CONCLUSION
1. The temperature affects the density, hardness and interfacial
bonding that occurs.
2. At temperatures of 300 °C, 350 °C and 400 °C, sinter density is
directly proportional to temperature sintering (occurring shrinkage).
Meanwhile, at a temperature of 450 °C sintered density decreased due
to swelling.
3. The greater the temperature is given, then the resulting violence is
also getting bigger. At temperatures of 300 °C, 350 °C, 400 °C and 450
°C respectively HV 29.46; 40.8 HV; 55.54 64.18 HV .
4. The bond formed by sintering temperature is only formed on the
surface ( the border area ) .
5. Diffusion happens is that there is interdiffusion of Mg into the Al .
6. At temperatures of 300 °C , 350 °C and 400 °C phase formed is Al ,
Mg , and periclase ( MgO ) . While at 450 °C temperature phase is
formed Aluminium magnesium (Al3Mg2) , Aluminum Magnesium Zinc
(AlMg2Zn).
24. APLICATION
The usefulness of this research initial to determine
interfacial bonding of composite Al-Mg-Si because
filler Si to change characteristik Al and Mg in
composite Al-Mg-Si
Research composite Al-Mg is master and initial
research composite Al-Mg-Si
Composite Al-Mg-Si is widely used aircraft
