The purpose of this study is to investigate the magnetic properties of oxide dispersion strengthened (ODS) ferritic steel. In this study, two samples of ODS ferritic steel powder were prepared by mechanical alloying method. The crystal structure and morphology of the samples were identified by X-ray Diffraction (XRD) analysis and examined by Field Emission Scanning Electron Microscopy (FESEM) respectively. The magnetic measurement including saturation magnetization (Ms), retentivity (Mr) and coercivity (Hc) of the samples were carried out at room temperature by using a Vibrating Sample Magnetometer (VSM). The magnetization curve of the samples (12Y and 14Y) approached the soft ferromagnetic behavior which is similar to its iron-based material due to the high content of iron (Fe) within the matrix. 12Y sample exhibit higher saturation magnetization, Ms value which is 295 emu/g due to the lower content of chromium (Cr) compared to 14Y sample which saturate at 162 emu/g.
Tujuan kajian ini dijalankan adalah untuk mengkaji kesan sepuh lindap terhadap kekerasan keluli ferit ODS-Y 2 O 3 tinggi. Sampel bagi kajian ini telah dibangunkan dengan menggunakan kaedah pengaloian mekanik dan diikuti dengan kaedah Tekan Isostasi Sejuk (CIP). Selepas proses pemampatan, sampel didedahkan dengan rawatan haba pada suhu 1100°C selama 1 jam di dalam relau pembakaran. Struktur kristal dan morfologi sampel masing-masing telah dianalisis dengan menggunakan Meter Belauan Sinar-X (XRD) dan dicirikan dengan menggunakan mikroskop elektron pengimbas pancaran medan (FESEM
The objective of this study is to investigate the microstructure and effect of annealing to the hardness properties of oxide dispersion strengthened (ODS) Fe-15Cr-0.3Y2O3 alloy. This type of alloy was prepared by mechanical alloying (MA) method followed by compacting and sintering. The microstructure of milled Fe-15Cr-0.3Y2O3 alloy powders and pellet was examined by using field emission scanning electron microscope (FESEM). The milled alloy powders consist of nearly spherical shape of powder particles with average size of 10 µm. For the alloy pellet microstructure, the formations of Y2O3 nanoparticles with average size of 5 nm were observed indicating the dispersion and incorporation of this nano-scale dispersoids into the alloy matrix. Fe-15Cr-0.3Y2O3 alloy pellet was annealed at temperature of 600°C, 800°C and 1000°C, respectively for the Vickers hardness test. The Vickers hardness test was performed by using a micro-Vickers hardness tester with a load of 200 gf. The hardness value (HV) of this alloy pellet started to decrease at temperature of 600°C indicating the grain growth of this material at high temperature
Photostimulated Luminescence (PSL) has been widely used as a rapid screening technique for the detection of various irradiated foods. This study aims to investigate the efficacy of the PSL technique in the detection of low dose-gamma irradiated spices available in the Malaysia market. Samples of clove, coriander, fenugreek, turmeric powder and curry powder were irradiated at very low doses; 0 (control), 0.2, 0.5 and 1 kGy using Cobalt-60 as a source. PSL measurements and analysis were undertaken under subdued lighting following EN 13751 methods. The PSL value in the form of photon counts (PCs/60s) of all samples as a function of the irradiation dose after 7 days of storage were determined which revealed that the PSL value increases proportionally to the radiation dose applied. The PSL also was able to discriminate between the non-irradiated (<700 PCs/60s, negative) and irradiated (>5000 PCs/60s, positive) samples after 7 days of storage. Coriander generates the highest PCs at the lowest dose (0.2 kGy) and highest dose (1 kGy) after that storage period. The PSL value of all spice samples is considered accurate and consistent at all irradiation doses. This technique is highly reliable for the detection of irradiated spices available in the Malaysia market.
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