Parikin Parikin
Center of Science and Technology for Advanced Materials, National Atomic Energy Agency/BATAN, Puspiptek Serpong, Banten 15314, Indonesia

Published : 5 Documents

Found 5 Documents

Majalah Ilmiah Pengkajian Industri Vol 10, No 1 (2016): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mipi.v10i1.97


Abstract Synthesis of a new niobium containing zirconium alloy of ZrNbMoGe has been developed in PSTBM-BATAN. In PWR/PHWR reactor, this materials face with liquid coolant i.e. H2O demin that may trig a reaction between hydrogen and containing zirconium. Hydridation tests in argon atmospheer were recently carried out looking for hydrogen effect in material. Hydrogenisation must be avoided due to causing brittle of the material via blistering of Zr-H compound system. Sample with 2%Nb, 0.5%Mo, 0.5%Ge and Zr in balance content has been hydridized by flowing H2 at temperature of 400 oC for an hour. Effects of the test by time-high temperatur dependence on the zirconium content were investigated by X-ray diffractometer. The observed peak at 220.95 was mathematically interpolated by orde-2 polynomial regression. Identifying peak was performed by X-ray diffraction technique and then it conformed ’search and match’ by JCPDS tracing. Results show that new phase in 400oC-1 hour hydridation sample was close to crystal structure of –ZrH2. The crystallographic data emphasize that new phase with lattice parameter of a= b= 3.52 Å and c= 4.45 Å (tetragonal) is (201) plane or 221.60. Also, the JCPDS traces another new orthorhombic phase of Nb3H3O9 at angle of 220.91 with lattice parameter of a= 9.183 Å, b= 22.47 Å and c=4.24 Å conforming to (220) plane. Hypothesized, this is an anti-hydride layer (passivity) that can overcome hydridation process of cladding materials in thereactor. AbstrakSintesis paduan zirkonium yang mengandung unsur Nb (ZrNbMoGe) telah dilakukan di PSTBM-BATAN. Dalam reaktor PWR/PHWR, bahan ini bersentuhan langsung dengan cairan pendingin, yakni: H2O demin yang bisa memicu reaksi antara Hidrogen dan kandungan zirkonium yang reaktif dalam paduan. Uji hidridasi dalam aliran gas H2 beratmosfir gas argon dilaksanakan untuk memprediksi kelakuan paduan ZrNbMoGe pada temperatur tinggi. Peristiwa hidridasi Zr-H sangat dihindari karena peristiwa blistering yang mampu merapuhkan bahan. Sampel paduan dengan kandungan 2%Nb, 0,5%Mo, 0,5%Ge and Zr dalam kesetimbangan telah diuji hidridasi dalam aliran gas H2 pada temperatur 400C selama 1 jam. Pengukuran pola difraksi menggunakan difraktometer sinar-X dengan target Cu. Puncak baru muncul pada sudut 220,95. Interpolasi matematis dilakukan via regresi polinomial orde-2. Identifikasi dan pencocokan profil menggunakan telusuran JCPDS “search and match”. Hasil memperlihatkan bahwa fasa hidridasi (400C-1 jam) sangat dekat dengan struktur kristal –ZrH2. Kristalografi fasa tersebut memiliki parameter kisi a= b= 3,52 Å dan c= 4,45 Å (struktur tetragonal) dengan refleksi pertama bidang (201) pada sudut 221,60. JCPDS juga menampilkan fasa lain berstruktur ortorombik pada sudut 220,91 dengan parameter kisi a= 9,183 Å, b= 22,47 Å and c= 4,24 Å dengan bidang refleksi (220). Fasa ini diduga merupakan lapisan anti-hidrid (passivatif) yang mampu menghalangi penggetasan bahan kelongsong akibat proses hidridisasi dalam reaktor.  
Transmission Electron Microscopy Characterization of High-Temperatur Oxidation of Fe-20Cr-5Al Alloy Prepared by Focused Ion Beam Technique Dani, Mohammad; Untoro, Pudji; Panca Putra, Teguh Yulius Surya; Parikin, Parikin; Mayer, Joachim; Dimyati, Arbi
Makara Journal of Technology Vol 19, No 2 (2015)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (397.594 KB) | DOI: 10.7454/mst.v19i2.3141


The Focused Ion Beam (FIB) technique was applied for cross section preparation of the oxidized alloy for Transmission Electron Microscopy (TEM) study. Prior to preparation, the specimens of Fe-20Cr-5Al alloy sheet were oxidized in air at 1200 oC for 2 minutes, 10 minutes, 2 hours, and 100 hours. The microstructure and elemental composition of the samples were characterized using TEM equipped with an Energy Dispersive X-Ray Spectroscopy (EDX). The Electron Energy Loss Spectroscopy (EELS) was used to determine of the light elements. The TEM investigation reveals remarkable microstructure evolution of the specimens during oxidation which generally exhibit a typical multi-layer structure. The TEM images, however, can provide detailed description about the phases occur after oxidation such as the Tungsten (W) and the Gallium (Ga) layers on top of the samples obviously formed during FIB preparation, the formation of Al2O3 and Cr2O3 layer, MgAl2O4 spinel, porosity, Zr/Hf/Mg phases or clusters inside the oxide scale. Hence, the FIB technique has been proven to be reliable preparation technique for microstructural and elemental studies of Fe-20Cr-5Al alloy using TEM.
Independency of Elasticity on Residual Stress of Room Temperature Rolled Stainless Steel 304 Plates for Structure Materials Parikin, Parikin; Allen, David
Makara Journal of Technology Vol 19, No 3 (2015)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (275.366 KB) | DOI: 10.7454/mst.v19i3.3217


Mechanical strengths of materials are widely expected in general constructions of any building. These properties depend on its formation (cold/hot forming) during fabrication. This research was carried out on cold-rolled stainless steel (SS) 304 plates, which were deformed to 0, 34, 84, and 152% reduction in thickness. The tests were conducted using Vickers method. Ultra micro indentation system (UMIS) 2000 was used to determine the mechanical properties of the material, i.e.: hardness, modulus elasticity, and residual stresses. The microstructures showed lengthening outcropping due to stress corrosion cracking for all specimens. It was found that the tensile residual stress in a specimen was maximum, reaching 442 MPa, for a sample reducing 34% in thickness and minimum; and about 10 MPa for a 196% sample. The quantities showed that the biggest residual stress caused lowering of the proportional limit of material in stress-strain curves. The proportional modulus elasticity varied between 187 GPa and of about 215 GPa and was free from residual stresses.
Texture Analysis using The Neutron Diffraction Method on The Non Standardized Austenitic Steel Process by Machining,Annealing, and Rolling Priyanto, Tri Hardi; Parikin, Parikin; Li, Meijuan
Makara Journal of Technology Vol 20, No 1 (2016)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (992.256 KB) | DOI: 10.7454/mst.v20i1.3254


Austenitic steel is one type of stainless steel which is widely used in the industry. Many studies on  austenitic stainless steel have been performed to determine the physicalproperties using various types of equipment and methods. In this study, the neutron diffraction method is used to characterize the materials which have been made from  minerals extracted from the mines in Indonesia. The materials consist of a granular ferro-scrap, nickel, ferro-chrome, ferro-manganese, and ferro-silicon added with a little titanium. Characterization of the materials was carried out in threeprocesses, namely: machining, annealing, and rolling. Experimental results obtained from the machining process generally produces a texture in the 〈100〉direction. From the machining to annealing process, the texture index decreases from 3.0164 to 2.434.Texture strength in the machining process (BA2N sample) is  8.13 mrd and it then decreases to 6.99 in the annealing process (A2DO sample). In the annealing process the three-component texture appears, cube-on-edge type texture{110}〈001〉, cube-type texture {001}〈100〉, and brass-type {110}〈112〉. The texture is very strong leading to the direction of orientation {100}〈001〉, while the {011}〈100〉is weaker than that of the {001}, and texture withorientation {110}〈112〉is weak. In the annealing process stress release occurred, and this was shown by more randomly pole compared to stress release by the machining process. In the rolling process a brass-type texture{110}〈112〉with a spread towards the goss-type texture {110}〈001〉 appeared,  and  the  brass  component  is markedly  reinforced  compared  to  the undeformed state (before rolling). Moreover, the presence of an additional {110} component was observed at the center of the (110) pole figure. The pole density of three components increases withthe increasing degree of thickness reduction. By increasing degrees of rolling from 81% to 87%, the value of orientation distribution function increases by a factor aboutthree times. 
PENGUKURAN PENGARUH TEKANAN PERAH PADA TEGANGAN SISA PADUAN AlSi SQUEEZE CASTING DENGAN TEKNIK DIFRAKSI SINAR-X[Measurements of Pressure Die Effects on The Residual Stresses of Squeeze Casting AlSi Alloys using X-Ray Diffraction Techniques] Parikin, Parikin; Suminta, S
Metalurgi Vol 27, No 3 (2012): Metalurgi Vol.27 No.3 Desember 2012
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (528.038 KB) | DOI: 10.14203/metalurgi.v27i3.230


PENGUKURAN PENGARUH TEKANAN PERAH PADA TEGANGAN SISA PADUAN AlSi SQUEEZECASTING DENGAN TEKNIK DIFRAKSI SINAR-X.Telah dilakukan pengukuran tegangan sisa bahanpaduan AlSi hasil pengecoran cara perah (squeeze). Tegangan sisa yang diukur dalam daerah intergranulardisekitar batas butiran dengan metode difraksi sinar-X. Tailoring teknik difraksi-metode Rietveld mampumendapatkan parameter regangan kisi rata-rata dan full width half maximum (FWHM) setiap fasa dalam paduan.Grafik memperlihatkan bahwa fasa aluminium mengalami tegangan compressive-tensile sedang fasa silikonmengalami total tegangan compressive. Dominasi komposisi unsur aluminium mengakibatkan pola distribusitegangan sisa dalam paduan AlSi mengikuti pola tegangan sisa dalam fasa aluminium, meskipun peregangan kisididominasi fasa silikon yang mengalami regangan negatif. Hasil penelitian memperlihatkan, kurva tegangan sisadalam bahan paduan AlSi berfluktuasi antara -800 GPa hingga 400 GPa. AbstractThe measurements of residual stresses on squeeze casting AlSi alloys has been carried out. The residualstresses were measured in the inter-granular areas around the grain boundaries of the phases by using X-raydiffraction techniques. The tailoring of diffraction method and Rietveld analysis could be applied to calculatethe average lattice strains of the phases and the profile parameters (FWHM) in the specimens. The graphshows that the aluminium phase was in compressive-tensile stresses while the silicon phase was in totallycompressive stresses. The domination of aluminium composition in the specimens tends to affect the residualstress behaviour of the squeeze casting AlSi alloys. The stress distribution of the alloys follows the profile ofstress curve of aluminium phase, even-though the strains were dominated by silicon phase in negative strains.The result shows that the hydrostatic residual stresses curve of squeeze casting AlSi alloys fluctuates betweenapproxiamately -800GPa and 400 GPa.