Effect of microstructural inhomogeneity on superplastic behaviour of multipass friction stir processed aluminium alloy

Pradeep, S.; Pancholi, V.

doi:10.1016/j.msea.2012.10.050

Cited by 42 publications

(19 citation statements)

References 32 publications

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“…Pancholi et al [90] demonstrated that at least 50% fine grain microstructure is required in the Al 5086 alloy for it to exhibit superior superplasticity when compared to the homogeneous fine-grained material. It was argued that microstructural refinement in the remaining 50% of coarse-grained microstructure, which leads to fully homogenous microstructure in the material, was the reason for higher superplasticity [84,87]. However in the work by Raja and Pancholi [88], layered microstructure material exhibited elongation lower than fully fine-grained microstructure.…”

Section: Illustration Of Nano-twin Formation During Superplastic Defomentioning

confidence: 97%

“…In classical superplastic literature, uniform fine-grained microstructure was considered favorable for superplasticity. However in Al alloys, inhomogeneous microstructure has shown to exhibit higher ductility than homogeneous fine-grained microstructure [74][75][76]87]. Pancholi et al [90] demonstrated that at least 50% fine grain microstructure is required in the Al 5086 alloy for it to exhibit superior superplasticity when compared to the homogeneous fine-grained material.…”

Section: Illustration Of Nano-twin Formation During Superplastic Defomentioning

confidence: 99%

“…Cavitation along the gauge length (in the thickness direction) at different points (tip end, mid-section, and shoulder end) of the tensile samples deformed at 500°C with a strain rate of 1 × 10 −3 s −1 . (a-c) NL, (d-f) TL, and (g-i) CL[87].…”

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confidence: 99%

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Effect of Grain Size on Superplastic Deformation of Metallic Materials

Raja¹,

Jayaganthan²,

Tiwari³

et al. 2020

Aluminium Alloys and Composites

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The superplastic deformation exhibited by metals with different grain sizes and their corresponding deformation mechanism influences the industrial metalforming processes. The coarse-grained materials, which contain grain size greater than 20 μm, exhibited superplastic deformation at high homologous temperature and low strain rate of the order of 10 −4 s −1. Fine grain materials (1-20 μm) are generally considered as favorable for superplastic deformation. They possess highstrain-rate sensitivity "m" value, approximately, equal to 0.5 at the temperature of 0.5 times the melting point and at a strain rate of 10 −3 to 10 −4 s −1. Ultrafine grains (100 nm to less than 1 μm) exhibit superplasticity at high strain rate as well as at low temperature when compared to fine grain materials. It is attributed to the fact that both temperature and strain rates are inversely proportional to the grain size in Arrhenius-type superplastic constitute equation. The superplastic phenomenon with nano-sized grains (10 nm to less than 100 nm) is quite different from their higher-scale counterparts. It exhibits high ductility with high strength. Materials with mixed grain size distribution (bimodal or layered) are found to exhibit superior superplasticity when compared to the homogeneous grain-sized material. The deformation mechanisms governing these superplastic deformations with different scale grain size microstructures are discussed in this chapter.

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Section: Illustration Of Nano-twin Formation During Superplastic Defomentioning

confidence: 97%

Section: Illustration Of Nano-twin Formation During Superplastic Defomentioning

confidence: 99%

See 1 more Smart Citation

Effect of Grain Size on Superplastic Deformation of Metallic Materials

Raja¹,

Jayaganthan²,

Tiwari³

et al. 2020

Aluminium Alloys and Composites

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“…Submicron grain structures (typically <300 nm [4]) in these materials can provide a unique combination of strength and ductility with possible superplastic behavior in some alloys [5][6][7][8][9][10]. Various techniques have been developed to process UFG materials.…”

Section: Introductionmentioning

confidence: 99%

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

Khodabakhshi

Gerlich

Simchi

et al. 2015

Materials Science and Engineering: A

101

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“…Similar to the HAZ, coarsening of precipitates in the TMAZ and over-aging can lead to degradation of mechanical properties [24][25]. Several studies on localized grain size refinements and homogenization of precipitates in various Al alloys [27][28] and composites [29][30] have been reported.…”

Section: Introductionmentioning

confidence: 99%