Zainuddin Sajuri

National University of Malaysia

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Mohd Zaidi Omar

National University of Malaysia

Junaidi Syarif

University of Sharjah

Amir Hossein Baghdadi

National University of Malaysia

S. Abdullah

National University of Malaysia

Yukio MIYASHITA

Nagaoka University

Yoshiharu MUTOH

Nagaoka University of Technology

M. F. Abdullah

National Defence University of Malaysia

Wan Fathul Hakim W. Zamri

National University of Malaysia

Mohd Shukor Salleh

Technical University of Malaysia Malacca

Ahmad Kamal Ariffin

Sultan Idris Education University

Cooperative Institutions

National University of Malaysia

106

University Kebangsaan Malaysia Medical Centre

Nagaoka University of Technology

Nagaoka University

Universiti Teknologi MARA

Tun Hussein Onn University of Malaysia

Technical University of Malaysia Malacca

Universiti Putra Malaysia

Universiti Sains Malaysia

National Institutes of Biotechnology Malaysia

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Microstructural morphology of rheocast A319 aluminium alloy

Advances in Mechanical Engineering (2016)

Ahmad Muhammad Aziz Mohd Zaidi Omar Zainuddin Sajuri Mohd Shukor Salleh

This article examines the evolution of the microstructure of A319 aluminium alloy as it flows along a cooling slope plate and discusses the type and influence of the intermetallic compounds thus formed. Numerous past research studies have analysed the microstructural transformation of alloys in a mould, but few researchers have investigated this phenomenon on the cooling slope plate. A change in the microstructure of the alloy from dendritic to non-dendritic is clearly obtained as the alloy moves from the impact zone to bottom zone on the cooling slope plate. It is important to clarify the mechanism of microstructural evolution through nucleation and fragmentation of the primary phase arm for fundamental understanding of research. Analysis by optical microscope and scanning electron microscope reveals the evolution of the microstructure and intermetallic compounds of A319 as it progresses along the cooling slope plate. The Vickers test was used to determine the hardness of the alloy thus produced. The results show the influence of the mould in obtaining a spheroidal microstructure; the microstructure in the bottom zone of the cooling slope plate is nearly spheroidal rather than fully spheroidal. The hardness of the alloy is enhanced when the microstructure is spheroidal and when the Mg 2 Si compound is present in the alloy.

Vickers hardness test

10.1177/1687814016649354

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Citations (7)

Study on Microstructure and Tensile Properties of New Cu-Al Bi-Metal Tubes Versus Pure Copper Tubes

Applied Mechanics and Materials (2013)

Amir Hossein Baghdadi Zainuddin Sajuri Junaidi Syarif

In recent years, heating, ventilation and air condition (HVAC) industries have attempted to find alternative materials such as aluminum for replacing copper metal because of a light weight metal with relatively lower market price compared to copper. This study characterizes microstructure and tensile properties of new Cu-Al bi-metal tubes (aluminum cladded copper (ACC) and copper cladded aluminum (CCA)) versus copper phosphorous alloy tube in order to estimate the possibility of implementing the composite tubes in heating, ventilation, and air conditioning industries. The result shows that Cu phosphorus alloy tubes has the highest tensile properties followed by CCA and ACC bi-metal tubes and different tube size does not affect the tensile properties of tube of the same type.

10.4028/www.scientific.net/amm.420.160

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Citations (3)

Microstructure and mechanical properties of selective laser melted 17–4 PH stainless steel; Build direction and heat treatment processes

Materials Today Communications (2023)

Mohammad Azlan Aripin Zainuddin Sajuri Nashrah Hani Jamadon Amir Hossein Baghdadi Intan Fadhlina Mohamed

Selective Laser Melting

Volume fraction

10.1016/j.mtcomm.2023.106479

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Citations (12)

Effects of Mn content and texture on fatigue properties of as-cast and extruded AZ61 magnesium alloys

International Journal of Mechanical Sciences (2005)

Zainuddin Sajuri Yukio MIYASHITA Yasunobu Hosokai Yoshiharu MUTOH

Fatigue limit

10.1016/j.ijmecsci.2005.09.003

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Citations (141)

A Study of Microstructure Properties of AISI D2 Tool Steel in Partial Re-Melting Method

Applied Mechanics and Materials (2014)

M. N. Mohammed Mohd Zaidi Omar Junaidi Syarif Zainuddin Sajuri Mohd Shukor Salleh

Due to the growing demand for cold-work tool steel in various industrial applications, it is crucial to improve the fabrication technique, because complex shapes involve an extensive and costly workshop effort. Hence, a one-step net-shaping process, such as the semi-solid forming, could offer great benefits. With the aim of finding a minimum process chain for the manufacturing of a high-quality production, the microstructural evolution of the ledeburitic AISI D2 tool steel in the semi-solid-state was studied experimentally via the Direct Partial Re-Melting Method (DPRM). Samples were heated in an argon atmosphere up to 1255°C, which corresponded to about 16% of liquid fraction, and held for 0 minute. The microstructural observation after DPRM showed that the equiaxed austenite grains are observable within a small liquid matrix. The microstructure also contains primary, non-dissolved carbides with a new, precipitated eutectic.

Equiaxed crystals

10.4028/www.scientific.net/amm.699.76

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Citations (3)

Characterising Ballistic Limits of Lightweight Laminated-Structure as a Protective Panel for Armoured Vehicle / N.A. Rahman...[et al.]

Najihah Abdul Rahman M. F. Abdullah S. Abdullah Wan Fathul Hakim W. Zamri Mohd Zaidi Omar

This study investigates the ballistic performance of aluminium alloy Al7075-T6 and magnesium alloy AZ31B served as the intermediate layer in triple-layered laminated panel using computational analysis. Aluminium and magnesium alloys offer a considerably potential for reducing the weight of an armoured vehicle body due to low densities and high energy absorption capabilities. The poor ballistic performance of these materials can be improved by layering with the high strength steel, Ar500. A commercial explicit finite element code was implemented to develop triple-layered panels impacted by a 7.62 mm armour piercing projectile at velocity range of 900 to 950 m/s. Two models were constructed where aluminium alloy and magnesium alloy served as intermediate layer in the first model and the second model respectively. The ballistic performance of each model in terms of ballistic limit velocity and depth of penetration was evaluated. Considering the 25% existing armour vehicle weight reduction, it was found that magnesium alloy has equivalent ballistic limit to that of aluminium alloy which is at 1020 m/s. At the standard projectile velocity, aluminium stopped the projectile at 24 mm depth and magnesium stopped at 25 mm. Thus, lightweight materials can be suitable combinations for designing lighter armoured vehicle panel without neglecting its ballistic performance.

Ballistic limit

Armour

Ballistic Impact

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Fatigue Mechanism of AZ61 Extruded Magnesium Alloy

Kikai Zairyou, Zairyou Kakou Gijutsu Kouenkai kouen rombunshuu/Kikai Zairyo, Zairyo Kako Gijutsu Koenkai koen ronbunshu (2004)

Zainuddin Sajuri Yukio MIYASHITA Yoshiharu MUTOH

Fatigue strengths of extruded AZ61 magnesium alloy plate in three different directions were investigated. Specimens were machined that the extrusion direction was parallel, perpendicular or 45-degree to the loading axis direction. Fatigue limit for the longitudinal, transverse and 45-degree specimens were 85, 63 and 67 MPa, respectively. Fatigue crack was nucleated from inclusions in the early stage of fatigue life for all three kinds of specimens. Fatigue crack growth behaviors of short and long cracks vere also investigated by using SECT and CT specimens, respectively. The results for short crack growth behaviors show that, transverse and 45-degree specimens exhibited higher fatigue crack growth rates compare to the longitudinal specimen. Fatigue crack growth curves arranged by effective stress intensity factor of all three directions for short crack coincide with those for long crack.

Paris' law

Fatigue limit

10.1299/jsmemp.2004.12.277

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Effect of sputtering target's grain size on the sputtering yield, particle size and coercivity (Hc) of Ni and Ni20Al thin films

IOP Conference Series Materials Science and Engineering (2016)

Mohammad Reza Zainuddin Sajuri Jumril Yunas Junaidi Syarif

Researches on magnetic thin films concentrated mainly on optimizing the sputtering parameters to obtain the desired thin film's properties. However, the effect of the sputtering target's properties towards the thin film's properties is not well established. This study is focused on analysing the effect of sputtering target's grain size towards the sputtering yield, particle size and the magnetic coercivity (Hc) of thin film. Two sets of sputtering targets; pure Ni (magnetic) and Ni20Al (at.%) (non-magnetic) were prepared. Each target has 2 sets of samples with different grain sizes; (a) 30 to 50μm and (b) 80 to 100μm. Thin films from each target were sputtered onto glass substrates under fixed sputtering parameters. The initial results suggested that the sputtering target's grain size has significant effect on the thin film's sputtering yield, particle size and Hc. Sputtering target with smaller grain size has 12% (pure Ni) to 60% (Ni20Al) higher sputtering yield, which produces thin films with smaller particle size and larger Hc value. These initial findings provides a basis for further magnetic thin film research, particularly for the seed layer in hard disk drive (HDD) media, where seed layer with smaller particle size is essential in reducing signal-to-noise ratio (SNR).

10.1088/1757-899x/114/1/012116

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Citations (13)

The Interface Morphology of Thixo-Joined Cold Work Tool Steel

Applied Mechanics and Materials (2014)

M. N. Mohammed Mohd Zaidi Omar Junaidi Syarif Zainuddin Sajuri Mohd Shukor Salleh

Cold-work tool steel is considered to be a nonweldable metal due to its high percentage content of carbon and alloying elements. The application of a new process of the semi-solid joining of two parts of AISI D2 cold-work tool steel is proposed using a partial remelting method. Samples were heated in an argon atmosphere up to 1275°C which corresponded to about 20% of liquid fraction and held for 10 minutes. Metallographic analyses along the joint interface showed a smooth transition from one to the other and neither oxides nor micro-cracking was observed. The current work successfully confirmed that avoidance of a dendritic microstructure in the semi-solid joined zone and high bonding quality components can be achieved without the need for force or complex equipment when compared to conventional welding processes.

Carbon fibers

10.4028/www.scientific.net/amm.663.276

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Fatigue characteristics of an extruded AZ61 magnesium alloy.

Journal of Japan Institute of Light Metals (2002)

Zainuddin Sajuri Yukio MIYASHITA Yoshiharu MUTOH

The objective of this research is to obtain basic fatigue characteristics of extruded AZ61 magnesium alloy in ambient air (20~50°C and 55~80%RH) . Fatigue tests were performed under tension-compression loading with stress ratio R = −1, frequencies of 1 and 10 Hz. At 55%RH, S–N curve clearly showed the fatigue limit, which was 145–150 MPa for both 20°C and 50°C. At a higher humidity of 80%RH, fatigue fracture occurred along the extrapolated S–N line even in the lower stress regime than the fatigue limit, which is known as corrosion fatigue. Time-dependent fatigue behavior was observed in the stress region lower than the fatigue limit, while cyclic-dependent fatigue behavior was observed in the stress region higher than the fatigue limit. In the corrosion fatigue regime, corrosion pits were observed on the specimen surfaces and also at the fatigue initiation point on the fracture surfaces. The corrosion pits were initiated at very early stage of fatigue and grew to make a fatigue crack started at about half of the fatigue life. Slip deformation on the specimen surface as well as humidity will be the essential factor to form corrosion pits.

Fatigue limit

Corrosion Fatigue

Cyclic stress

10.2464/jilm.52.161

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Citations (21)