Microstructural and mechanical behaviors of nano-SiC-reinforced AA7075-O FSW joints prepared through two passes

Bahrami, Mohsen; Nikoo, Mohsen Farahmand; Givi, Mohammad Kazem Besharati

doi:10.1016/j.msea.2014.12.009

Cited by 76 publications

(37 citation statements)

References 18 publications

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“…According to Zener pinning effect, the driving force for grain boundary migration would be counteracted by the pinning pressure exerted by reinforcement particles. Consequently, normal grain growth would be inhibited and the average grain size could not exceed a critical maximum grain radius (R C ) given by the equation R C = 4r/3f, where r and f are the radius and volume fraction of reinforcements, respectively [30]. Thus, the nano-particle incorporation in the weld line results in finer grains in the nugget.…”

Section: Methodsmentioning

confidence: 99%

“…After the recrystallization and in the grain growth stage, the individual SiC particles suppress grain coarsening by impeding the boundaries and resulting in finer grains, i.e., Zener effect. On the other hand, these ceramic particles have high hardness themselves [14,30] which exhibit strong resistance to dislocation motion. Therefore, the produced nanocomposite exhibited high levels of hardness and strength.…”

Section: Microhardnessmentioning

confidence: 99%

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Friction stir welding of AA5052: the effects of SiC nano-particles addition

Bodaghi

Dehghani

2016

Int J Adv Manuf Technol

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In the present work, the AA5052 aluminum sheets were joined by friction stir welding (FSW) technique. In order to refine the microstructure of stir zone (SZ) and to prevent the grain growth of heat-affected zone (HAZ), the SiC nanoparticles were added to the weld nugget. To obtain the optimum condition for FSW, three rotational speeds (800, 1000, and 1250 rpm) and three traveling speeds (30, 50, and 80 mm/ min) were applied. Microstructural evolutions were characterized using optical and scanning electron microscopes. Besides, the mechanical properties (tensile strength, hardness, and wear test) of weldment were also studied. The results showed that adding the SiC nano-particles led to the significant grain refining of the welds. However, the improper SiC powder distribution during one pass of FSW resulted in the premature fracture of workpiece. The specimens joined at the rotational speed of 1000 rpm and welding speeds of 50 and 80 mm/min exhibited the highest ultimate tensile strength.

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Section: Methodsmentioning

confidence: 99%

Section: Microhardnessmentioning

confidence: 99%

Friction stir welding of AA5052: the effects of SiC nano-particles addition

Bodaghi

Dehghani

2016

Int J Adv Manuf Technol

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“…Bahrami et al investigated the mechanical properties of the FSW joints using three different tools. They observed that using the square pin enhanced the tensile strength and elongation of the joints [28]. Elangovan et al Fig.…”

Section: Methodsmentioning

confidence: 97%

Study on the effects of friction stir welding process parameters on the microstructure and mechanical properties of 5086-H34 aluminum welded joints

Jamalian

Farahani

Givi

et al. 2015

Int J Adv Manuf Technol

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In this study, the effects of tool rotational and traverse speeds on the mechanical properties and the microstructure of the friction stir welded joints from Al 5086-H34 were studied. Insufficient heat generation and inadequate metal transportation at very low rotational speed and high turbulence in the plasticized metal at very high rotational speed emerged tunnel and worm hole defects into the weldment. It was discovered that as rotational and traverse speed increased, the average grain size of the weldment decreased due to more dynamic recrystallization and amplified stirring effect. An increase in the rotational speed increased the ultimate tensile strength and microhardness of the specimens. At the best welding condition, by employing the rotational and traverse speeds of 1250 rpm and 80 mm/min, respectively, 51 % enhancement in the elongation and 8 % increase in the microhardness of the welded samples were obtained. Moreover, the ultimate tensile strength of this welded joint reached to 85 % of the base metal.

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“…In analytical modeling of manufacturing operations including metal cutting, the concept of pure and/or simple shear is often used interchangeably [31][32][33][34][35][36]. Moreover, many books on engineering plasticity (e.g.…”

Section: Pure and Simple Shearmentioning

confidence: 99%

“…Using the information provided in books by Oxley [35] and Shaw [74], the authors in their analysis assumed that the single-shear plane model is valid and that metal cutting is accomplished by pure plastic deformation. In the author's opinion, however, it presented a number of problems in the analysis and led to unexplained experimental results.…”

Section: Large Strain Extrusionmachining (Lsem)mentioning

confidence: 99%

Modern Manufacturing Engineering

Davim¹

2015

Materials Forming, Machining and Tribology

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Microstructural and mechanical behaviors of nano-SiC-reinforced AA7075-O FSW joints prepared through two passes

Cited by 76 publications

References 18 publications

Friction stir welding of AA5052: the effects of SiC nano-particles addition

Friction stir welding of AA5052: the effects of SiC nano-particles addition

Study on the effects of friction stir welding process parameters on the microstructure and mechanical properties of 5086-H34 aluminum welded joints

Modern Manufacturing Engineering

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