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RISS 인기검색어
- 검색키워드
- 저자 : Ali ShokuhFar (검색결과 3 건)
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Ali Shokuhfar,Mahmoud Shamsborhan 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.5
A new severe plastic deformation (SPD) method based on equal channel angular pressing (ECAP) is introduced for producing ultrafinegrains in bulk alloys, entitled as “Planar twist channel angular extrusion (PTCAE)”. In PTCAE method, there is additional angle, α, (plusφ and ψ angles in ECAP method) which represents angle associated with the lateral reversal arc of curvature in deformation zone. Threedimensional finite element method (FEM) simulations of both ECAP and PTCAE processes were performed in order to investigate theplastic deformation state of processed samples and, moreover, the effect of different die geometry (in terms of variation of planar twistangle) on plastic strain distribution and magnitude. Results revealed that PTCAE process related with ECAP process can impose higherstrain values in different shear planes simultaneously in one deformation zone. Therefore, PTCAE can produce UFG or nanostructuredmaterials better than ECAP method which has simpler design and significantly higher efficiency compared with other new SPD processes.
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Golsa Naderi,Ali ShokuhFar,Rahim Naghizadeh,S. Atashgar,Hamid Reza Rezaie 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.1
Tialite (Al2TiO5) is a ceramic material of very low thermal expansion coefficient, excellent thermal shock resistance, high refractoriness and good corrosion resistance. However, industrial applications of this material are hindered by two major limitations: decomposition to its parent oxides, alumina and rutile between 800 and 1280 oC and its low thermal mechanical properties. In the present study addition of talc with a good stabilizing effect has been studied on aluminum-titanate (tialite)- based ceramics. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the effect of talc on phase evolutions, sintering, and the microstructure of aluminum-titanate, and also density measurements were performed after sintering. The results showed that the presence of talc reduces the unreacted alumina and rutile significantly. The formation of Mg0.3Al1.4Ti1.3O5 and other solid solutions of MgO and aluminum-titanate were observed. Tialite (Al2TiO5) is a ceramic material of very low thermal expansion coefficient, excellent thermal shock resistance, high refractoriness and good corrosion resistance. However, industrial applications of this material are hindered by two major limitations: decomposition to its parent oxides, alumina and rutile between 800 and 1280 oC and its low thermal mechanical properties. In the present study addition of talc with a good stabilizing effect has been studied on aluminum-titanate (tialite)- based ceramics. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the effect of talc on phase evolutions, sintering, and the microstructure of aluminum-titanate, and also density measurements were performed after sintering. The results showed that the presence of talc reduces the unreacted alumina and rutile significantly. The formation of Mg0.3Al1.4Ti1.3O5 and other solid solutions of MgO and aluminum-titanate were observed.
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The effect of sonication power on the sonochemical synthesis of titania nanoparticles
Amir Hassanjani-Roshan,Seyed Mohammad Kazemzadeh,Mohammad Reza Vaezi,Ali Shokuhfar 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.3
Titanium dioxide (TiO2) nanoparticles were synthesized by a sonochemical method. C12H28O4Ti (Tetraisopropyl titanate),ethanol (C2H5OH), sodium hydroxide (NaOH) and deionized water were used as the initial materials. The output power of the ultrasonic device plays the most important role in the size and morphology of the final products. Sonochemical processes at different sonication power were carried out at synthesis temperature (50 oC) for 1.5 h and then the materials were washed and dried at room temperature for 48 h. To determine the particle size and also evaluate the morphological properties, X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used. TG/DTA analysis was used to for determine the temperature and time of crystallization. From TEM observations the size of titanium dioxide nanoparticles is estimated to be significantly smaller than ~12 to ~30 nm.
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