Recrystallization mechanisms during friction stir welding/processing of aluminum alloys

McNelley, Terry R.; Swaminathan, Srinivasan; Su, Jianping

doi:10.1016/j.scriptamat.2007.09.064

Cited by 539 publications

(256 citation statements)

References 22 publications

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“…The texture is a characteristic B-fiber shear texture, similar to that reported after FSW of similar alloys. [17][18][19] This alignment is most apparent at the middle of the stir zone (Figure 2(c)) and is consistent with the shear deformation induced by rotation of the pin. The apparent rotational symmetry about an axis nearly aligned with the ND suggests that the shear plane is a cylindrical plane that is coaxial with the tool with the shear direction being tangential to the cylinder surface and perpendicular to the tool axis.…”

Section: Orientation Imaging Microscopysupporting

confidence: 79%

The Effect of Friction Stir Processing on the Microstructure and Mechanical Properties of an Aluminum Lithium Alloy

Giles

Oh-ishi

Zhilyaev

et al. 2008

Metall Mater Trans A

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Friction stir processing (FSP) was conducted on a wrought plate of AA2099 to refine and homogenize the microstructure and enhance the through-thickness ductility and fracture resistance. Optical microscopy (OM), orientation imaging microscopy (OIM), and transmission electron microscopy (TEM) methods were employed to evaluate microstructure and microtexture in as-received material and in material subjected to FSP as well as postprocessing heat treatments. Hardness and orientation-dependent tensile test data were combined with anticlastic bending fatigue data to characterize the as-received, processed, and processed and heat-treated conditions of the material.

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Section: Orientation Imaging Microscopysupporting

confidence: 79%

The Effect of Friction Stir Processing on the Microstructure and Mechanical Properties of an Aluminum Lithium Alloy

Giles

Oh-ishi

Zhilyaev

et al. 2008

Metall Mater Trans A

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“…However, it is still not clear whether discontinuous DRX (DDRX), continuous DRX (CDRX), or particle stimulated nucleation (PSN) of recrystallization leads to grain refinement. McNelley et al [49] have considered all the models of DRX mentioned above and their applicability during FSP. Recently, a calculation by Kumar et al [20] showed that critical condition for nucleation of DDRX was not met during FSP of TRC Al-Mg-Sc alloy.…”

Section: Grain Refinement Mechanismmentioning

confidence: 99%

Ultrafine-Grained Al-Mg-Sc Alloy via Friction-Stir Processing

Kumar

Mishra

2012

Metall Mater Trans A

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Friction-stir processing (FSP) of twin-roll cast (TRC) Al-Mg-Sc alloy resulted into ultrafinegrained microstructure. The alloy was processed in as-received and aged (563 K [290°C], 22 hours) conditions and at three different tool rotation rates: 800, 400, and 325 rpm. The microstructural features were characterized using electron backscattered diffraction (EBSD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The grain size varied from 0.89 lm to 0.39 lm depending on the processing and initial thermo-mechanical conditions of the alloy. The TRC alloy processed at 325 rpm in aged condition had all the grains less than 1 lm, and 95 pct of grains had high-angle grain boundaries (HAGBs). In all the cases, the fraction of HAGBs were more than 80 pct. The variation of misorientation angle distribution was similar to the theoretical MacKenzie distribution for cubic crystal materials. Grain size analysis at different sections and locations on the transverse section of the dynamically recrystallized zone showed a homogeneous and equiaxed microstructure. The average dispersoid (Al 3 (Sc,Zr)) size was~8.0 nm in diameter obtained using high-resolution TEM. Grain size reduction was observed with increase in Zener-Hollomon parameter. It was shown that under the current microstructural and deformation conditions, dynamic recrystallization via particlestimulated nucleation might not be possible during FSP.

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“…The macro shear banding phenomena has been already reported for pure Al after different severe plastic deformation procedures (e.g., ECAP [43,44] and FSP [45,46] ). As is observed, the serrated boundaries may coincide with each other and give rise to newly recrystallized grains through geometric dynamic recrystallization (GDRX) mechanism.…”

Section: Wwwadvancedsciencenewscom Wwwaem-journalcommentioning

confidence: 64%

Grain Refinement through Shear Banding in Severely Plastic Deformed A206 Aluminum Alloy

et al. 2017

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The present work is conducted to study the microstructure and texture evolutions in an as-cast A206 aluminum alloy after applying severe plastic deformation. Toward this end, the material is severely deformed through accumulative back extrusion (ABE) technique at 200 C and followed by assessing the room temperature mechanical properties of the products. The macro shear-bands formation in the highly strained regions can result in grain refinement through the geometric dynamic recrystallization mechanism. A significant refinement is also characterized within the micro shear-bands; this is attributed to the intensified substructure development and the occurrence of continuous dynamic recrystallization. The corresponding inverse pole figure maps show similar orientation for these newly refined grains with the parent ones. A random texture is produced through sub-grain rotation to dissimilar orientation at the intersection of micro-bands. The assessment of mechanical properties of the processed materials reveal significant increase in both yield and ultimate tensile strength values. The hardness profiles also demonstrate a relatively homogenous microstructure after three and five ABE passes holding a mean hardness value of 183 Vickers.

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Recrystallization mechanisms during friction stir welding/processing of aluminum alloys

Cited by 539 publications

References 22 publications

The Effect of Friction Stir Processing on the Microstructure and Mechanical Properties of an Aluminum Lithium Alloy

The Effect of Friction Stir Processing on the Microstructure and Mechanical Properties of an Aluminum Lithium Alloy

Ultrafine-Grained Al-Mg-Sc Alloy via Friction-Stir Processing

Grain Refinement through Shear Banding in Severely Plastic Deformed A206 Aluminum Alloy

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