On the role of cooling and tool rotational direction on microstructure and mechanical properties of friction stir processed AZ91

Asadi, Parviz; Givi, Mohammad Kazem Besharati; Parvin, Nader; Araei, Ata Aghaei; Taherishargh, M.; Tutunchilar, S.

doi:10.1007/s00170-012-3971-0

Cited by 70 publications

(31 citation statements)

References 37 publications

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“…But, increase in the number of passes caused uniform distribution of particles in a much larger area and as a consequence, their volume fraction decreased as observed in Fig. 2 [14] and Asadi et al [26]. In the present study we tried to reveal the grain structure of SZ in different samples by routine metallographic techniques.…”

Section: Accepted Manuscriptsupporting

confidence: 51%

Effect of friction stir processing pass sequence on properties of Mg–ZrSiO 4 –Al 2 O 3 surface hybrid micro/nano-composites

2016

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Section: Accepted Manuscriptsupporting

confidence: 51%

Effect of friction stir processing pass sequence on properties of Mg–ZrSiO 4 –Al 2 O 3 surface hybrid micro/nano-composites

2016

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“…The combination of high temperature, as a result of frictional heat, and high strain rate, due to the severe plastic deformation, leads to generation of fine recrystallized grains in the stir zone (Fig. 8) (Asadi et al 2012;2010b). Therefore, the grain refinement occurs by the DRX including nucleation and growth.…”

Section: Microstructure Evolution During Fswmentioning

confidence: 99%

“…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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“…Low heat input welding process in friction stir processing is needed for joining heat sensitivity alloys like magnesium [13]. AZ91/Al 2 O 3 nanocomposites fabricated by means of friction stir processing and the consequences of processing parameters including tool traverse speed and tool rotational speed on the mechanical properties of the composite have been studied further [14][15].…”

Section: Introductionmentioning

confidence: 99%

Role of tool pin profiles on wear characteristics of friction stir processed magnesium alloy ZK60/silicon carbide surface composites

Kumar

Padmanaban

Balasubramanian

2020

Materialwissenschaft Werkst

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Poor friction and wear resistance are the major drawbacks that restrict structural applications of ZK60 magnesium alloys. The surface properties of magnesium alloy can be enhanced by reinforcing particles in the surface using friction stir processing (FSP). Tool pin profile is the significant process parameters which influences the material flow, particle breakups and its distribution in the processed zone. In this study, an attempt was made in order to understand the major effects of tool pin profiles namely, cylindrical thread (CT), plain cylindrical (PC), plain tapered cylindrical (PTC) and square (SA) pin profiles on the microstructure characteristics and particle distribution of friction stir processed/silicon carbide particle surface composites. The surface composites fabricated by plain tapered cylindrical pin profile yield superior properties which is attributed to the higher shear force and balanced state of material flow and heat generation in the processed zone. The formation of smaller grains and hardness enhancement due to dispersion strengthening are the main causes to get better wear resistance of friction stir processed/silicon carbide particle magnesium alloy.

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On the role of cooling and tool rotational direction on microstructure and mechanical properties of friction stir processed AZ91

Cited by 70 publications

References 37 publications

Effect of friction stir processing pass sequence on properties of Mg–ZrSiO 4 –Al 2 O 3 surface hybrid micro/nano-composites

Effect of friction stir processing pass sequence on properties of Mg–ZrSiO 4 –Al 2 O 3 surface hybrid micro/nano-composites

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

Role of tool pin profiles on wear characteristics of friction stir processed magnesium alloy ZK60/silicon carbide surface composites

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