Characterization of AZ91/alumina nanocomposite produced by FSP

Faraji, Ghader; Asadi, Parviz

doi:10.1016/j.msea.2010.11.065

Cited by 161 publications

(63 citation statements)

References 28 publications

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“…It has been utilized to weld and process different aluminum (Heidarzadeh et al 2015), Mg (Asadi et al 2012;2010b;Motalleb-nejad et al 2014;Faraji and Asadi 2011), and Cu (Farrokhi et al 2013) alloys, some of which are classified as practically unweldable alloys in use of conventional welding methods.…”

Section: Introductionmentioning

confidence: 99%

Microstructural simulation of friction stir welding using a cellular automaton method: a microstructure prediction of AZ91 magnesium alloy

Asadi

Givi

Akbari

2015

Int J Mech Mater Eng

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Background: Recently, some researchers have simulated FSW using FEM and studied the influence of process parameters and tool geometry on material flow, welding force, and temperature and strain distributions during friction stir processing. Additionally, in terms of microstructure modeling, various approaches such as the Cellular Automaton (CA) model have been developed to simulate microstructural evolution during plastic deformation processes. Method: In this work, a finite element model (FEM) is established to study the microstructure evolution during friction stir welding (FSW) of AZ91 magnesium alloy. To this aim, first, the hot compression tests at different temperatures and strain rates were carried out to achieve the flow stress curves. Then, the hardening parameter, the recovery parameter and the strain rate sensitivity were calculated according to flow stress results and using the Kocks−Mecking model. Next, a continuum based thermo-mechanically coupled rigid-viscoplastic FEM model was proposed in Deform-3D software to simulate the FSW of AZ91 magnesium alloy. To evaluate microstructure of the weld zone a model is proposed based on the combination of Cellular Automaton and Laasraoui-Jonas models.

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Section: Introductionmentioning

confidence: 99%

Microstructural simulation of friction stir welding using a cellular automaton method: a microstructure prediction of AZ91 magnesium alloy

Asadi

Givi

Akbari

2015

Int J Mech Mater Eng

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“…2) of tool leads to grain refinement; however, grain coarsening occurs if very high speeds are opted because high rotations raise the matrix temperature consequently leading to the growth of grains recrystallized due to FSP [19,27,28,34]. Likewise, excessive feed rate (f) also causes grain growth which, in turn, results in the poor strength and hardness of the FSPed material [21,23].…”

Section: Methodsmentioning

confidence: 99%

“…The aluminum being light in weight is reinforced with ceramic particulates in order to obtain a material with enhanced thermal and wear performance and desired mechanical properties. Amongst various ceramics, SiC and Al 2 O 3 have been widely incorporated as reinforcing materials in FSP [27][28][29][30][31][32][33][34][35][36][37]. If long time liquid-metal contact with the reinforcing SiC phase is evaded, the Al-SiC composites show outstanding properties.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on multi-pass friction stir processing of Al/TiN composite: some microstructural, mechanical, and wear characteristics

Hussain

Hashemi

et al. 2015

Int J Adv Manuf Technol

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TiN is an exceptionally hard and a wear-resistant ceramic. In the present work, the effect of mixing TiN particulates into the Al7075-T651 alloy was studied by employing a novel material fabrication technique called friction stir processing (FSP). The FSP was carried out using three different tool geometries (namely square, triangular, and threaded taper) with an objective to fabricate the Al/TiN composite with an appropriate set of mechanical and wear properties. A number of microstructural, mechanical, and wear tests were carried out in order to characterize the composite. In comparison to the parent metal, each of the composite specimens showed improved wear and friction performance. However, the improvement in the hardness was realized only with the threaded tool and that in the tensile strength was observed with the square tool, thus revealing a tool-property relationship in FSP. Contrarily, the ductility of all of the composite specimens was lower relative to that of the parent metal. A suitable tradeoff among various characteristics was realized when FSP was performed using the square tool. The microscopic and energy dispersive spectroscopy (EDS) analyses showed that the dominant wear mechanism in the composite was adhesion. This study is the first report on the FSPed Al/TiN composite.

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“…In comparison with the powder metallurgy methods, use of FSP for alloying and production of intermetallic is more simple and economic due to elimination of the secondary operations such as powder preparation, powder compaction and sintering 7 . FSP is an advanced mechanical and solid state process which, is mainly used for processing such as alloying, grain refinement and also fabrication of surface composite and nano-composite layers in the metals 8 . Rotational and traverse speeds of tool, geometry of tool, processing passes number and features of the secondary phase (mainly a reinforcing powder) are dominant processing parameters of this method which they can determine the characteristics of the product.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Microstructural Characterization of Hybrid Cu-SiC-Zn Composites Fabricated Via Friction Stir Processing

2016

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In this work, an attempt has been made to fabricate hybrid Cu-SiC-Zn composites by friction stir processing technique. Through this investigation the different number of passes was applied to assess the effect of pass adding on the mechanical, microstructural and dislocation density behavior of the specimens. Formation of the intermetallic phases between the copper matrix and Zn particles was discovered through the processed specimens. According to the obtained results, the higher passes led to obtain more uniform dispersion of the SiC particles and intermetallic phases. This higher level of particles and intermetallic phases' distribution causes remarkable reduction of grain sizes through the composites. Dislocation density for the processed specimens was determined by using the hardness measurement method. The calculated values for the dislocation densities showed that presence of SiC particles and intermetallic phases could rise up the dislocation values. Measured microhardness values for the composites exhibit that they enhanced rather than base metal and these results were confirmed by dislocation densities values of the specimens.

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Characterization of AZ91/alumina nanocomposite produced by FSP

Cited by 161 publications

References 28 publications

Microstructural simulation of friction stir welding using a cellular automaton method: a microstructure prediction of AZ91 magnesium alloy

Microstructural simulation of friction stir welding using a cellular automaton method: a microstructure prediction of AZ91 magnesium alloy

An experimental study on multi-pass friction stir processing of Al/TiN composite: some microstructural, mechanical, and wear characteristics

Mechanical and Microstructural Characterization of Hybrid Cu-SiC-Zn Composites Fabricated Via Friction Stir Processing

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