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Aziz K. Jahja
Pusat Teknologi Bahan Industri Nuklir (PTBIN) - BATAN Kawasan Puspiptek, Serpong, Tangerang 15314
Mechanical Engineering

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Analysis of Ni25at%Cr Debye-Waller Factor Jahja, Aziz K.; Effendi, Nurdin
MESIN Vol 9, No 3 (2007): Ocean Thermal Energy Conversion (OTEC) untuk "Pulau-pulau Kecil"
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Analysis of Ni25at%Cr Debye-Waller Factor. Intensity analysis on X-ray diffractionexperiment was carriedout on Ni25at%Cr solid bulk sample to study the effect ofheat treatment on thephysical properties. Rietveld analysis (RIETAN) on both the untreated and heat-treated samplesincorporates both structural parameters such as Debye-Waller temperature factor and non-structuralparameters such as peak-position, peak-width, and peak broadening. Changes in these parameters havebeen observed in these samples, normally associated with changes in the materials properties after heattreatment,although previous residts show that the samplesmicrostructure and crystal group symmetryhave not been altered. Careful analysis revealed that on the atomic scale, the materials physicalcharacteristics such as Debye temperature, molar heat capacity, and homogenous and inhomogeneousstrain, thermal coefficient expansion have experienced some changes. Therefore this finding should havephysical impact onthe materials, such as convection-heat rate and thermal conductivity.
Corrosion Studies on SS-321 in Sodium-Chloride Solution Medium Effendi, Nurdin; Wihatmoko, Wihatmoko; Jahja, Aziz K.
MESIN Vol 9, No 2 (2007): MEMINIMALKAN KERUGIAN KAMPUS AKIBAT BANJIR
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Corrosion Studies on SS-321 in Sodium-Chloride Solution Medium. Experimentalcorrosion studies on commercial SS-321 have been carried out. The experiments were carried out in asodium chloride medium with a concentration variation of 0.4 mol. 0.5 mol, 0.6 mol, and 0.7 molcorresponding topH values of 7.0, respectively. The experiments were carried out using a type ofM-273EG&G potentiostat/galvanometer test instrument. The post-corrosion samples microstructure wereanalyzed with the aid of EDS (energy dispersive spectroscopy) equipped SEM instrument to detect thepresence of any viable corrosion byproducts. Forfurther verification x-ray diffraction method was alsoused to detect anypossible emerging corrosion byproducts on the samples surfaces. Experimentalresultsconfirm that AISl-321 commercial alloys immersed in a sodium chloride corrosion medium with avariation of concentration experience very little or almost no corrosion, and that according to the socalledFontana s criteria these test-materials turn out to have an excellent resistance toward sodiumchloriccorrosion. This is also evidenced by the very low corrosion rate value measured in this study.EDSstudy and X-ray diffraction results indicate that thepossible ensuing corrosion byproducts are ironoxides, chrome oxides, iron chlorides, and nickel hydrideoxide.
Co-Authors Nurdin Effendi Wihatmoko Wihatmoko, Wihatmoko