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RISS 인기검색어
- 검색키워드
- 저자 : Mohsen Reihanian (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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Microstructural Investigation and High Temperature Mechanical Behavior of AXE622 Cast Mg Alloy
A. Habibi Eftekhar,S. Mohsen Sadrossadat,M. Reihanian 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.5
The microstructure and high temperature properties of the AXE622 Mg alloy were investigated after the conventional andsemisolid casting processes. The tensile test was conducted at room temperature, and 473 K. Impression creep test was performedat a temperature range of 423–498 K under the stress range of 450–600 MPa. The microstructure of the conventionaland semisolid alloys contains α-Mg dendrites, the eutectic phase, secondary phases including (Mg–Al)2Ca, eutectic Mg17Al12,and Al11RE3. During semisolid processing, coarse dendrites of the α-Mg became fine, globular, and Rosetta shape. Theaverage length of the secondary phases in the semisolid alloy decreased from 4.21 to 2 μm and the average grain size of theα-Mg reduced from 113 to 96 μm. Semisolid processing caused a significant improvement in the tensile and creep resistanceof the AXE622 Mg alloy. The stress exponent for creep was calculated in the range 5.6–7.7 for the conventional alloy andin the range 10.3–11 for the semisolid alloy. The activation energy for conventional and semisolid alloy was determined as71.4 kJ/mol and 78.3 kJ/mol, respectively. It was concluded that the dominant creep mechanism in the conventional alloywas the grain boundary diffusion-controlled dislocation climb, while in the semisolid alloy was the power-law breakdown.
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