Nur Maizatul Shima Adzali
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Preferred name
Nur Maizatul Shima Adzali
Official Name
Nur Maizatul Shima, Adzali
Alternative Name
Adzali, Nur Maizatul Shima
Adzali, Nor Maizatul Shima
Adzali, N. M.S.
Main Affiliation
Scopus Author ID
55899257000
Researcher ID
EKO-9660-2022

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  • Publication
    The effects of henna fillers on the properties of polyurethane foam composites
    ( 2020-01-01)
    Adnan S.A.
    ;
    Zainuddin F.
    ;
    Nur Hidayah Ahmad Zaidi
    ;
    Zulkeply N.A.
    ;
    Nur Maizatul Shima Adzali
    ;
    Zuraidawani Che Daud
    Polyurethane (PU) foam were produced from polyol (PolyGreen R3110) and 4,4-diphenylmethane diisocyanate (Maskiminate 80) with distilled water as a blowing agent. Natural fibers have received more attention from researchers due to their ability to increase the properties of the polymer composites. In this work, PU/Henna foam composites were prepared by used Henna fibers at different loading of 5, 10, 15 and 20 wt. %. The effect of different Henna loading on PU foam were investigated by density, compression test, morphology and water absorption. Core density of PU/Henna foam composites increased with addition Henna compared to control PU and showed highest core density of 85.10 kgm-3 . Compressive strength decreased to 0.53 MPa after Henna addition at 5 % PU/Henna foam composites. Henna addition to 20 % PU/Henna foam composites were reduced the compressive strength to 0.97 MPa due to stiffness effect of Henna that contributed to embrittlement of the cell wall. The distorted cell wall and less uniform of cell structure were proved by SEM due to Henna addition as compared to control PU. Water absorption percentage of PU/Henna foam composites were increased with Henna addition as compared to control PU. It is because hydrophilic properties of Henna tendency to absorb moisture.
  • Publication
    Effects of Heat Treatment on the Properties of SS440C for Blades Applications
    ( 2023-01-01)
    Nur Maizatul Shima Adzali
    ;
    Salihin S.K.
    ;
    Nur Hidayah Ahmad Zaidi
    SS440C steel is commonly used for knife blades, bearings, valve parts, and medical equipment. The composition of SS440C steels is designed to increase hardness especially in blade applications. The effect of quenching and tempering heat treatment on the properties of SS440C was investigated in this study. Quenching heat treatment is done at 1000 Â°C, followed by tempering at 150 and 500 Â°C in a muffle furnace. Microstructure of SS440C samples were studied using an optical microscope (OM) and scanning electron microscope (SEM). Properties of SS440C after heat treatment have been investigated using the Rockwell hardness test and tensile test. It was found that the sample quenched at 1000 Â°C (without temper) had the highest hardness with 58.4HRC, while the as-received annealed sample had 11.4HRC followed by sample tempered at 150 Â°C with 57.5HRC and 500 Â°C with 54.1HRC. Tensile testing reveals that quenching and tempering at 500 Â°C result in the highest maximum stress compared to other samples. Through optical microscopy observation, a sample tempered at 500 Â°C has larger size of carbide precipitate than sample that quenched and tempered at a 150 Â°C. Insufficient carbide dissolution or a more abrasive reaction is revealed by larger carbide sizes. In conclusion, SS440C temper at 500 Â°C reflects that it has better properties than the other.
  • Publication
    Heat treatment of ss 316l for automotive applications
    ( 2020-01-01)
    Nur Maizatul Shima Adzali
    ;
    Azhar N.A.
    ;
    Zuraidawani Che Daud
    ;
    Nur Hidayah Ahmad Zaidi
    ;
    Adnan S.A.
    Stainless steel 316L (SS 316L) is a low carbon-chromium-nickel-molybdenum austenitic stainless steel. Its application in automotive industry include as exhaust housings for catalytic converters and turbocharger. In this research, the tempering heat treatment was conducted by using SS 316L samples. These steels were austenitized at 860 °C for 1 hours before doing two tempering process. Austempering was conducted at 360 °C for 15 min in the muffle furnace then air cooled while martempering was conducted at 160 °C for 15 min in a muffle furnace then quench in water. The corrosion test was carried out using 1.0 M oxalic acid solution for 30 days in room temperature. Hardness test and microstructural observation were carried out for SS 316L before and after corrosion test. Experimental result showed that untreated sample have highest hardness value before and after corrosion test which were 232 HV and 225 HV respectively. The hardness value before corrosion test is 199.7 HV for austempered sample, and 201.3 HV for martempered sample. Untreated sample shows the lowest corrosion rate (0.94×10-3 mpy), followed by austempered sample (1.89 x 10-3 mpy) and the highest corrosion rate is for martempered sample (2.36×10-3 mpy). After corrosion, under optical microscope observation, martempered steel has more pits than austempered steel. In summary, austempering is the best heat treatment for SS 316L in automotive applications that give high ductility and toughness after heat treatment with high corrosion resistance.
  • Publication
    The effect of aging time on microstructure and hardness value of AZ80 Mg Alloy
    ( 2020-11-24)
    Zuraidawani Che Daud
    ;
    Azahar S.H.
    ;
    Mohd Nazree Derman
    ;
    Nur Maizatul Shima Adzali
    ;
    Nur Hidayah Ahmad Zaidi
    ;
    Adnan S.A.
    AZ 80 Magnesium (Mg) alloy (AZ80) is the lightest structural metallic materials with good mechanical properties. However, Mg AZ80 has drawbacks which result in poor ductility and low strength where applications of Mg alloy have been restricted. The AZ80 has high aluminium content can cause the precipitation of ß-phase which is Mg17Al12 in Mg-Al alloy. It can affect the mechanical properties such as poor strengthening. This paper was discussed the effect of aging time on microstructure and hardness value of AZ80. The AZ80 samples were cut to 1cm × 1cm. Samples heat treated at 360 C for one-hour quenching in water. Then, samples aged at 170 C with different aging times (2 to 8 hours) with same quench. Optical Microscope (OM), Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and Vickers Microhardness machine were used to analyse the samples. As the results showed ß-Mg17Al12 phase was discontinuously distributed along the grain boundary throughout solid solution treatment. The ß-Mg17Al12 phase did not fully dissolve into the α-Mg phase and distributed along the grain boundary. The results showed that sample after 2 hours aging time with highest hardness value 62.5 HV is the optimum sample.