M. Refai Muslih
Pusat Sains dan Teknologi Bahan Maju (PSTBM)-BATAN, Kawasan Puspitek Serpong, Tangerang 15314.

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ANALYSIS OF CRYSTAL STRUCTURE OF THE WELDS WITH FRICTION-STIR WELDING METHOD ON THE RETREATING SIDE FOR BIMETALLIC DISIMILAR AA6061-Cu USING NEUTRON DIFFRACTION TECHNIQUES Priyanto, Tri Hardi; ., Bharoto; Muslih, M. Refai; Mugirahardjo, Hery
Jurnal Sains Materi Indonesia Vol 14, No 3 (2013): April 2013
Publisher : BATAN

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Abstract

Crystal structure analysis has been performed on bimetallic disimilar Al-Cu. Neutron diffraction analysis shows that Al lattice parameter decrease from 4.09 Å to 4.05 Å while the Cu lattice parameter is relatively constant. This is due to the melting point ofAl is much lower than the melting point of Cu. Physically, during the Friction Stir Welding (FSW) process in the Stir Zone (SZ) or Nuget Welded Zone (NWZ) region, strong deformation occurs at temperatures around 500 oC. This leads to dynamic recrystallization where grains become more refined. At the Thermo Mechanically Affected Zone (TMAZ) region, atomic diffusion occurs due to a combination of strong plastic deformation at high temperatures. And for Heat Affected Zone (HAZ) area there are aluminium even with a very small percentage of weight, this is due to the exposure at a high temperature during the heating FSW process, similar with annnealing-like process, which leads to the dislocation disappears, dissolves and precipitates grain becomes rough when the temperature exceeds 250 oC.Keywords: Bimetal disimilar AA6061-Cu, Friction stir welding, Neutron diffraction, Stir Zone, Thermo Mechanically Affected Zone, Heat Affected Zone, Base Metal Zone
DOUBLE AXIS MODE OF BATAN’S TRIPLE AXIS SPECTROMETER Purwanto, Agus; Santoso, Eddy; Hafid, Irfan; Muslih, M. Refai
Jurnal Sains Materi Indonesia Vol 7, No 2: FEBRUARI 2006
Publisher : BATAN

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DOUBLE AXIS MODE OF BATAN’S TRIPLE AXIS SPECTROMETER. Triple Axis Spectrometer (TAS), which is an indispensible tool to microscopically probe inelastic scattering processes in condensed matter, has been installed at the Neutron scattering Laboratory of the R & D Center for Materials Science & Technology, BATAN, since 1992. However, the control and data acquisition system have been nonfunctional since 1996. Following an in-house development of the alternative control and data acquisition hardware last year, TAS started to show the capability and reliability of handling the measurement in the double axis mode. This paper reports a double axis mode control and data acquisition software development which benefits from the hardware development.
PEMBENTUKAN FASA DAN PENGARUHNYA PADA SIFAT MAGNETIK KOMPOSIT MAGNET BERBASIS SERBUK MAGNET Nd2Fe14B HASIL MELTSPINNING. Mujamilah, Mujamilah; Sugeng, Bambang; Yulianti, Evi; Muslih, M. Refai; Purwanto, Setyo; Ridwan, Ridwan
Jurnal Sains Materi Indonesia VOL 3, NO 2: FEBRUARI 2002
Publisher : Center for Science & Technology of Advanced Material - National Nuclear Energy Agency of

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PEMBENTUKAN FASA DAN PENGARUHNYA PADA SIFAT MAGNETIK KOMPOSIT MAGNET BERBASIS SERBUK MAGNET Nd2Fe14B HASIL MELTSPINNING. Telah dilakukan studi pembentukan fasa dan sifat magnetik pada komposit magnet berbasis serbuk magnet Nd2Fe14B dengan poliester. Studi dilakukan dengan menganalisis fasa dan kurva histeresis komposit magnet dengan komposisi 75% v/v MQP-0/25% v/v poliester sebagai fungsi berbagai kondisi serbuk. Hasil studi menunjukkan bahwa serbuk MQP-0 mempunyai komposisi dengan tingkat Fe berlebih yang mengakibatkan terbentuknya fasa magnet lunak α-Fe disamping fasa magnet keras Nd2Fe14B pada serbuk. Proses penghalusan awal akan memisahkan fasa—fasa ini dan memberikan fraksi α-Fe dominan pada serbuk dengan ukuran halus dan fraksi magnet keras dominan pada serbuk kasar. Proses penghalusan lanjut akan menurunkan fasa α-Fe dan menumbuhkan fasa kristalin Nd2Fe14B. Kehadiran fasa magnet lunak α-Fe pada matriks fasa magnet keras Nd2Fe14B menyebabkan peningkatan pada harga magnetisasi saturasi dan remanensi bahan namun menurunkan tingkat medan koersivitas bahan. Secara umum kondisi ini mempengaruhi harga produk energi magnetik bahan.