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Influence of Zn Content on Microstructures,Mechanical Properties and Stress Corrosion Behavior of aa5083 aluminum alloy

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Acta Metallurgica Sinica(English Letters) 2020年第10期33卷 1369-1378页

作者： Zhixiong Zhu Xingxu Jiang Gang Wei Xiaogang Fang Zhihong Zhong Kuijing Song Jian Han Zhengyi Jiang School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China School of Materials Science and Engineering Tianjin University of TechnologyTianjin 300384China School of Mechanical Engineering and Automation University of Science and Technology LiaoningAnshan 114051China

To enhance the stress corrosion cracking(SCC)resistance,Zn was utilized as an alloy element to add in the aa5083 aluminum *** effects of Zn content on the microstructures,mechanical properties and SCC resistance were systematically *** results demonstrate that in the studied range adding Zn can significantly improve the SCC resistance of the aa5083 *** is related to the relatively low amount of continuous β(Al3Mg2)phase along grain boundary and the formation of Zn-containing phase such as Al5Mg11Zn4 *** on the results,the optimal Zn content with respect to SCC resistance is approximately 0.50 wt.%.Further increasing Zn content results in coarse precipitates discontinuously distributed along grain boundaries.

关键词： aa5083 aluminum alloy Slow strain rate test Precipitation Stress corrosion cracking

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Significant improvements in mechanical properties of aa5083 aluminum alloy using dual equal channel lateral extrusion

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Transactions of Nonferrous Metals Society of China 2016年第12期26卷 3081-3090页

作者： N.FAKHAR F.FERESHTEH-SANIEE R.MAHMUDI Department of Mechanical Engineering Faculty of EngineeringBu-Ali Sina University School of Metallurgical and Materials Engineering College of EngineeringUniversity of Tehran

Dual equal channel lateral extrusion (DECLE), as a severe plastic deformation (SPD) process, was employed forimproving the mechanical properties of aa5083 aluminum alloy. Several experiments were conducted to study the influences of theroute type, namely A and B, and pass number on mechanical properties of the material. The process was conducted up to 6 passeswith decreasing process temperature, specifically from 573 to 473 K. Supplementary experiments involving metallography, hardnessand tensile tests were carried out in order to evaluate the effects of the process variables. The hardness measurements exhibitedreasonably uniform distributions within the product with a maximum increase of 64% via a 6-pass operation. The yield and ultimatestrengths also amended 107% and 46%, respectively. These significant improvements were attributed to the severe shear deformationof grains and decreasing pass temperature, which intensified the grain refinement. TEM images showed an average grain sizereduction from 100 μm for the annealed billet to 200 nm after 6 passes of DECLE. Finally, the experimental findings for routes A andB were compared and discussed and some important conclusions were drawn.

关键词： aa5083 aluminum alloy severe plastic deformation dual equal channel lateral extrusion hardness homogeneity

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Effect of twin-roll casting parameters on microstructure and mechanical properties of aa5083-H321 sheet

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Transactions of Nonferrous Metals Society of China 2016年第10期26卷 2552-2560页

作者： A.HOSEINIFAR S.SALARI M.SOLTAN ALI NEZHAD Department of Materials Science and Engineering School of Engineering Shiraz University Department of Mining and Metallurgical Engineering Amirkabir University of Technology Metallurgical and Materials Engineering Department Faculty of EngineeringFerdowsi University of Mashhad

Thepurpose of the present paper is to study the mechanical propertiesand microstructureof the twin-roll cast and cold rolled aa5083 aluminum alloy sheet in strain-hardened H321 temper. To reach this goal, first, a sound surface slab of 8.90 mm thick and 1260 mm wide was cast by a 15°; tilt back twin roll caster at a casting speed of 490 mm/min. After homogenization at 520 ℃, the product was cold rolled to two thicknesses of 6.30 mm and 3.85 mm with an intermediate annealing at 370 ℃ and final stabilization at 180 ℃. Opticalmicroscopyand scanning electron microscopy （SEM） investigations of the as-cast state depicted the segregation of intermetallic particles mainly in grain boundaries which wasthe cause of grain removal observed in the fracture surface of tensile test samples. In addition, mechanical properties indicated an increase in total elongation after homogenization heat treatment dueto the elimination of the grain boundary segregations. Finally, it was observed that the properties of the 3.85 mmthick sheet were consistent with the H321 temper requirements according to ASTM B 290M standard due to applying sufficient cold reduction during cold rolling stage.

关键词： aa5083 aluminum alloy twin-roll casting cold rolling H321 strain-hardened temper

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