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RISS 인기검색어
- 검색키워드
- 저자 : Amin Abdollahzadeh (검색결과 3 건)
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Advanced Approach to Modify Friction Stir Spot Welding Process
Behrouz Bagheri,Mahmoud Abbasi,Amin Abdollahzadeh,Hamid Omidvar 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.10
Nowadays, friction stir spot welding (FSSW) is used in automotive, rail vehicle construction, the aerospace industry, andelectrical industry. In the current research, a modified version of the FSSW process entitled friction stir spot vibration weldingwas introduced to join Al5083 specimens. The joining specimens were vibrated normal to the tool movement direction,while the joint position cooled by passing coolant through the fixture. Different characteristics of developed joint namelymicrostructure, mechanical properties, corrosion behavior were studied. The results showed that stir zone grain size decreasedsignificantly as the vibration was employed and the joint position was cooled. It was found that vibration enhanced thedynamic recrystallization and coolant decreased the grain growth. Both led to enhanced grain refinement in the stir zone. The results also indicated that shear strength and hardness of the weld region increased as the modified version of FSSWwas applied. Corrosion tests revealed that corrosion resistance increased as the modified method was applied.
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Behrouz Bagheri,Ali Shamsipur,Amin Abdollahzadeh,Seyyed Ehsan Mirsalehi 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.4
In this work, aluminum-copper composites reinforced with 50 nm and 250 nm SiC particles are fabricated on the interfaceof sheets by friction stir spot welding for the first time. In addition, the finite element method is used to study visual andunderstand the temperature distribution and mechanical characteristics of the composite with different nanoparticle sizes. Micro stress/strain field mainly simulated the impacts of particle size and particle distribution in the matrix. Results showedthat large reinforcing particles lead to an increase in temperature distribution and grain size in the stir zone of the jointsample. It was also concluded that the addition of finer nanoparticle size causes higher shear tensile (5.4 MPa) and Von-Mises stress (260 MPa) in the workpiece due to higher homogeneous distribution and less agglomeration in the matrix. Inaddition, the thickness of the intermetallic compound (IMCs) layer at the interface of the joint interface was analyzed as SiCparticles with different sizes are used due to higher interaction and intermixing between materials. The stress distributionand equivalent plastic strain of particles in the stir zone, with the uniform distribution of reinforcing particles for lower size(50 nm), increased.
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Behrouz Bagheri,Mahmoud Abbasi,Farzaneh Sharif,Amin Abdollahzadeh 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9
A developed version of friction stir brazing (FSB) entitled friction stir vibration brazing (FSVB) was presented to fabricatelow carbon steel joint using %67wt Sn-%33wt Pb alloy as a braze metal. This attempt aims to analyze the role of mechanicalvibration and rotational speed on microstructure and mechanical behaviors of the brazed samples. Furthermore, the thermalanalysis, the thickness of intermetallic compounds (IMCs) layers, and void volume percentage at the joint interface werestudied. It was concluded that the temperature during the joining process increased and the coherency of the joint interfaceenhanced while FSVB was applied instead of FSB. In addition, the grains in the joint zone under the FSVB process weresmaller than those produced under the conventional FSB process. The results also showed that the mechanical performance,namely hardness, and shear strength increased and the thickness of the IMCs layer along with the void volume percentagein the brazed sample decreased as rotational speed increased from 850 to 1150 rpm. The results indicated that rotationalspeeds over 1150 rpm had detrimental effects on mechanical properties. This is related to the effect of high heat input andinduced temperature on brazing flow and filler-base metal interaction.
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