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RISS 인기검색어
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- 저자 : Evgeny Trofimov (검색결과 2 건)
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Majid Naseri,Mohsen Reihanian,Ahmad Ostovari Moghaddam,Davood Gholami,Mohammad Alvand,Ehsan Borhani,Evgeny Trofimov 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.2
This study examined mechanical properties of AA2024 alloy and its correlation between strain path and crystallographictexture. Accumulative roll bonding (ARB) and cross accumulative roll bonding (CARB) were used to severely deformAA2024 alloys. Electron backscatter diffraction (EBSD) studies demonstrated that nano/ultrafine grains were formed by thestrain routes after eight cycles. It was also found that the lamellar boundary spacing and the mean boundary spacing were~ 360 ± 10 nm and 845 ± 10 nm after eight ARB cycles. In contrast to the ARB, the CARB specimen had equiaxed microstructurescharacterized by grains with a size of 150 and 100 nm. The CARB processed specimen exhibited a mean misorientationangle of 41.83° and a fraction of high angle grain boundaries of 78%, these values were 34.57° and 67% for ARB treatedspecimen, respectively. It was observed that the evolved texture is greatly affected by the strain paths. The ARB processedspecimen revealed strong Copper {112} <111>, Dillamor {4 4 11} <11 11 8>, S {123} <634>, and Brass {011} <211>components. In contrast, the CARB processed specimen showed major texture with prominent Copper {112} <111>, Brass{011} <211>, Rotated Cube {001} <110>, S {123} <634>, and Goss {011} <100> components. In the CARB specimen, theGoss/Brass texture ratio was intensified and the mechanical properties were superior (tensile strength: 535 MPa, microhardness:182 HV, elongation: 11.9%) compared with the ARB processed specimen (tensile strength: 455 MPa, microhardness:145 HV, elongation: 9.2%). Further, the change in strain path did not significantly affect the intensity of Goss and Cubecomponents, ruling out any further recrystallization tendency.
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Synthesis and Characterization of Nanocrystalline High Entropy Heusler Intermetallics Powders
Ahmad Ostovari Moghaddam,Rahele Fereidonnejad,Majid Naseri,Nataliya Shaburova,Sergey Taskaev,Sergey Uporov,Dmitry Mikhailov,Amir Hossein Lashkari,Evgeny Trofimov 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.5
This study demonstrates the possibility of bringing novel Full Heusler high-entropy intermetallic compounds (FH-HEICs)to nanoscale regime. To this end, Co2(FeNiMnMgZn)Al, Co2(TiZrTaNbCr)Al and Cr2(TiZrTaNbV)(AlSi) FH-HEICs areprepared by mechanical alloying for 20 h. All FH-HEICs crystallize in a mixture of partially ordered B2-type and disorderedA2-type crystal structures, which exhibit higher degree of disordering compared to the ideal L21 structure. Scanningelectron microscope micrographs and Energy dispersive spectroscopy mapping confirm the homogenous distribution ofelements within the nanocrystalline particles. Co2(FeNiMnMgZn)Al and Co2(TiZrTaNbCr)Al exhibited semi hard magneticbehavior with magnetic saturation of 50.93 emu/g and 18.73 emu/g at 300 K, respectively. Cr2(TiZrTaNbV)(AlSi)exhibited hard magnetic behavior with giant coercivity of 3.5 kOe and low magnetic saturation of about 0.2 emu/g. Finally,we introduce FH-HEICs as a novel group of functional materials with potentially intricate magnetic and catalytic properties,in which the order-disorder transition and wide chemical composition range provide unprecedented opportunity totune their structural and functional properties.
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