Cryogenic friction-stir processing of ultrafine-grained Al–Mg–TiO2 nanocomposites

Khodabakhshi, F.; Gerlich, A.P.; Simchi, A.; Kokabi, A.H.

doi:10.1016/j.msea.2014.10.048

Cited by 99 publications

(31 citation statements)

References 74 publications

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“…During FSW, a small tool tilt angle can form a less-defect processed region via increased axial impact loading and material flow [25]. Many FSP researchers have drawn on this concept to make the reinforced particles distribute in the matrix more uniformly [6,12,26,27]. The tool tilt angle in FSP process is usually less than 5 • .…”

Section: Influence Of Process Parametersmentioning

confidence: 99%

Research Status and Prospect of Friction Stir Processing Technology

Liu

Zhao

2019

Coatings

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Friction stir processing (FSP) is a novel solid-phase processing technique that is derived from friction stir welding (FSW). The microstructure of the base metal can be modified with the friction heat and stir function during processing. It can be used to fabricate surface composites and in situ composites by adding reinforced particles into the metal matrix via FSP. Friction stir processing can significantly improve the hardness, wear resistance, ductility, etc., while preventing defects caused by material melting. It is an ideal material processing technology and has good prospects in the field of superplastic materials and for the preparation of metal matrix composites. This paper reviews research developments into the principle, process, and applications of FSP technology as well as its future research directions and development prospects.

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Section: Influence Of Process Parametersmentioning

confidence: 99%

Research Status and Prospect of Friction Stir Processing Technology

Liu

Zhao

2019

Coatings

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“…[2,3] Severe plastic deformation (SPD) methods are being extensively used to develop bulk UFG composites. Accumulative roll bonding (ARB), [4,5] equal channel angular pressing (ECAP), [6] high-pressure torsion (HPT), [7] and friction stir processing (FSP) [8,9] are well-established SPD techniques used to develop bulk UFG composites. These deformation techniques store a high fraction of dislocation density in the matrix, refine the microstructure in the UFG/NS regime and hence impart extraordinary properties to UFG composites.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability, Grain Growth Kinetics, and Mechanical Properties of Bulk Ultrafine-Grained AA6063/SiC Composites with Varying Reinforcement Sizes

Bembalge

Panigrahi

2019

Metall Mater Trans A

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Bulk ultrafine-grained (UFG) AA6063/4wt pct SiC composites with varying reinforcement sizes [12 lm (coarse), 1 lm (fine), and 45 nm (nano)] have been developed by a hybrid route of stir-casting and cryorolling. In the current study, the influence of annealing temperatures (423 K to 573 K) on the precipitation evolution, particle-stimulated nucleation (PSN), recrystallization, grain growth kinetics, and thermal stability of developed bulk UFG composites have been studied, and the resultant effect of microstructural evolution is correlated with mechanical properties. UFG coarse and UFG fine composites have shown evidence of recrystallized grains via PSN and retained their UFG microstructure up to 473 K and 523 K, respectively. Superior microstructural stability with retained UFG microstructure up to 573 K was observed in the UFG nanocomposite due to the effective pinning of nano-SiC particles and precipitates along grain boundaries. This ultimately resulted in the increased grain growth activation energy and strength of the UFG nanocomposite. However, the overall increase in strength is maximum in the UFG nanocomposite due to the dominant effect of dislocation strengthening, grain boundary strengthening, and precipitation strengthening mechanisms. A thorough examination of the microstructural evolution of UFG composites at different annealing temperatures along with their mechanical behavior is presented in this paper.

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“…In this process, a nonconsumable rotating tool containing a shoulder and a pin with specific design and geometry is plunged into the surface to be modified and after frictional heating, which then travels along the specific direction to stir the surrounding area due to the high temperature severe plastic deformation (SPD) caused by extruding the solidified materials from leading to trailing edge (Nandan et al, 2008). Despite the widespread applications of this process for processing of ultrafine grained metals/alloys (Hofmann & Vecchio, 2005;Khodabakhshi et al, 2015a), homogenising powder metallurgy parts (Khodabakhshi et al, 2013;Liu et al, 2014b), and modification of casting products (Mahmoud, 2013), it has only recently attracted significant interest for fabrication of metal matrix nanocomposites (Mishra et al, 2003;Mishra & Ma, 2005;Khodabakhshi et al, 2015e).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, improvement the mechanical performance of the Al-Mg alloys can be considered a crucial engineering challenge. Refining the grain structure of aluminium alloy into the nano-or ultrafine scale ranges by means of severe plastic deformation (SPD) (Khodabakhshi et al, 2015b) and reinforcing the ductile Al-Mg alloy metal-matrix with stronger and stiffer nanosized reinforcing agents to make an Al-matrix nanocomposites (Khodabakhshi et al, 2015a(Khodabakhshi et al, , 2015c(Khodabakhshi et al, , 2017a are two effective approaches for strengthening of Al-Mg alloys. In particular, nanocomposite fabrication is a very promising route considering there are fewer downstream processing limitations, because superior mechanical strength can be attained while simultaneously increasing the thermal stability or even the ductility (Zhou et al, 2003;Khodabakhshi et al, 2014bKhodabakhshi et al, , 2015dKhodabakhshi et al, , 2017a.…”

Section: Introductionmentioning

confidence: 99%

Influence of CNTs decomposition during reactive friction‐stir processing of an Al–Mg alloy on the correlation between microstructural characteristics and microtextural components

Khodabakhshi

Nosko

Gerlich

2018

Journal of Microscopy

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Multipass friction-stir processing was employed to uniformly disperse multiwalled carbon nanotubes (MW-CNTs) within an Al-Mg alloy metal matrix. Decomposition of MW-CNTs occurs in situ as a result of solid-state chemical reactions, forming fullerene (C60) and aluminium carbide (Al C ) phases during reactive high temperature severe plastic processing. The effects of this decomposition on the microstructural features, dynamic restoration mechanisms and crystallographic microtextural developments are studied for the first time by using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) analysis. The formation of an equiaxed grain structure with an average size of ∼1.5 μm occurs within the stirred zone (SZ) under the influence of inclusions which hinder grain boundary migration via Zener-Smith pinning mechanisms during the discontinuous dynamic recrystallisation (DDRX). Formation of two strong Cubic and Brass microtextural components in the heat affected zone (HAZ) and thermomechanical affected zone (TMAZ) was noted as compared to the completely random and Cube components found in the base and SZ regions, respectively. The microstructural modification led to hardening and tensile strength improvement for the processed nanocomposite by ∼55% and 110%, respectively with respect to the annealed Al-Mg base alloy.

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Cryogenic friction-stir processing of ultrafine-grained Al–Mg–TiO2 nanocomposites

Cited by 99 publications

References 74 publications

Research Status and Prospect of Friction Stir Processing Technology

Research Status and Prospect of Friction Stir Processing Technology

Thermal Stability, Grain Growth Kinetics, and Mechanical Properties of Bulk Ultrafine-Grained AA6063/SiC Composites with Varying Reinforcement Sizes

Influence of CNTs decomposition during reactive friction‐stir processing of an Al–Mg alloy on the correlation between microstructural characteristics and microtextural components

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