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| Articles
by
Khamirul Amin Matori |
Total Records (
4 ) for
Khamirul Amin Matori |
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Tasiu Zangina
,
Jumiah Hassan
,
Khamirul Amin Matori
,
Raba`ah Syahidah Azis
,
Chifu Ebenezer Ndikilar
and
Fatin Hana Naning
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Background and Objective: The study of relaxation and ionic conductivity behavior of conducting materials comes to be a significant area of research interest due to their potential application in electronic devices. The objective of the present study was to investigate the dielectric relaxation property of lithium aluminum titanium phosphate Li1.5Ti1.5 (PO4)3 with NASICON-type structure. Materials and Methods: The material was prepared by conventional solid state technique, while characterization was carried out using X-ray powder diffraction (XRD) and impedance spectroscopy (IS) analysis technique. The structure and phase composition of the material was indicated by XRD analysis. Temperature and frequency dependence of AC conductivity and dielectric relaxation behavior were obtained at different temperatures from 30-280°C within the frequency range of 40 Hz to 1 MHz. Results: The AC conductivity was observed to be frequency-independent in the low frequency region and frequency-dependent at higher frequency region (10 KHz to 1 MHz). For dielectric permittivity analysis, the dielectric constant ε’ and dielectric loss ε” were found to increase at low frequency and decrease as frequency increased at all temperatures. The calculated AC conductivity of 6.61×10–4 (Ωm)–1 was observed at room temperature (30°C). The relaxation energy (Ea) of 0.21 eV was obtained from electrical modulus formalism. Conclusion: The synthesized sample Li1.5Ti1.5Al0.5 (PO4)3 indicated two relaxation processes, in each relaxation the peaks shifted to higher frequency as the measuring temperature increased. |
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Firouz Fadaeifard
,
Farhad Gharavi
,
Khamirul Amin Matori
,
Abdul Razak Daud
,
Mohd Khairol Anuar Mohd Ariffin
and
Mokhtar Awang
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Friction stir welding of Aluminum alloys has been increasingly
used in the industry on the ground of higher welding quality in comparison with
conventional methods. However, not enough studies have been done on a lap joint
of AA 6061-T6 which widely been used in aerospace industries. In this article,
friction stir lap welding of 6061-T6 aluminium alloy with 5 mm thickness was
carried out by using various welding speeds. The effect of welding speed on
microstructure, lap shear performance, micro hardness, failure mode and effective
plate thickness was investigated. Results showed that tensile shear strength
of weld increased by the rising welding speed. Rising welding speed caused hooking
and thinning approaches to two plate interfaces which in turn concluding in
higher tensile shear strength. The fracture surface of welds was analyzed by
field emission scanning electron microscopy (FE-SEM). Study of the fracture
surface of the nugget zone by EDX indicated the Fe compounds in that region. |
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Khamirul Amin Matori
,
Mehran Tamjidy
,
Firouz Fadaeifard
,
Farhad Gharvi
,
Hang Tuah Baherodin
and
Shahla Paslar
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Friction stir welding as a new method of joining is getting more popular whereas
the statistical approach as an advanced method of quality management is widely
used. Here, a full factorial design 22 (two factors at two levels) with replicates
was
conducted to investigate the influence of the factors rotational speed (900
and
1200 rpm) and the welding speed (40 and 60 mm min-1) in the Friction Stir Lap
Welding (FSLW) process for the purpose of UTS-AS, UTS-RS, grain size-WZ,
grain size-HAZ and EPT. The study used plates of Al-alloys AA6061-T6. The
factors rotational speed and welding speed were significant and an increase
in the welding speed and a decrease in the rotational speed contributed to all
the
responses in FSLW. Effect of interaction was not significant for all responses
such
as UTS-AS, grain size-WZ, grain size-HAZ and EPT and the contribution of this
effect to the UTS-RS were positive, but less than 18%. The response surface
analysis and table of ANOVA indicate that the most effective level of factors
for
FSLW process in this study was achieved using a 900 rpm and 60 mm min-1
solution of rotational speed and a welding speed, respectively. |
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Mohammed Sabah Ali
,
M.A. Azmah Hanim
,
C.N.A. Jaafar
,
S.M. Tahir
,
M. Norkhairunnisa
and
Khamirul Amin Matori
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The preparation of porous alumina ceramics-reinforced begins with the use of (Cu) metal in nanoscale
particles as a strengthening phase. At the same time, the solid state and sacrificial techniques are used for the
preparation of this porous alumina ceramics-reinforced. Meanwhile, FESEM used to examine the microstructure.
The main goal of this research study is to determine the effects of the (Cu) metal in nanoscale particles on the
mechanical properties and porosity of porous alumina ceramics. Cu metal added to different ratios of graphite
waste as a pore agent. The initial ratio of (Cu) metal added was at 3 wt.%. And this ratio was increased to 6, 9
and 12 wt.% Cu. The results of this study indicate that with an increase in the ratios of (Cu) metal, the porosity
shows a decrease while the mechanical properties show an increase. The observed increase in the mechanical
properties could be attributed to not only a decrease in the porosity but also to the toughening mechanism of
porous alumina ceramics. The areas of potential applications for this type of ceramics include, filtration, thermal
and the purging of gas. |
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