Effect of second phase particles on grain refinement during equal-channel angular pressing of an Al–Mg–Mn alloy

Nikulin, Ilya; Kipelova, Alla; Malopheyev, Sergey; Kaibyshev, Rustam

doi:10.1016/j.actamat.2011.10.023

Cited by 124 publications

(69 citation statements)

References 32 publications

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“…Depending on the deformation temperature, the developed microstructures were characterized by somewhat different distributions of grain boundary misorientations ( Figure 3). At all temperatures, there were a number of low-angle subboundaries which is also an indicative of continuous dynamic recrystallization as the structural mechanism of ultrafine grain evolution during MDF [27,[30][31][32]. The height of the peak corresponding to low-angle subboundaries decreased with increasing temperature.…”

Section: Philosophical Magazine 4183mentioning

confidence: 86%

Σ3 CSL boundary distributions in an austenitic stainless steel subjected to multidirectional forging followed by annealing

Tikhonova

Kuzminova

Fang

et al. 2014

Philosophical Magazine

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The effect of processing and annealing temperatures on the grain boundary characters in the ultrafine-grained structure of a 304-type austenitic stainless steel was studied. An S304H steel was subjected to multidirectional forging (MDF) at 500-800°C to total strains of~4, followed by annealing at 800-1,000°C for 30 min. The MDF resulted in the formation of ultrafine-grained microstructures with mean grain sizes of 0.28-0.85 μm depending on the processing temperature. The annealing behaviour of the ultrafine-grained steel was characterized by the development of continuous post-dynamic recrystallization including a rapid recovery followed by a gradual grain growth. The post-dynamically recrystallized grain size depended on both the deformation temperature and the annealing temperature. The recrystallization kinetics was reduced with an increase in the temperature of the preceding deformation. The grain growth during post-dynamic recrystallization was accompanied by an increase in the fraction of Σ3 n CSL boundaries, which was defined by a relative change in the grain size, i.e. a ratio of the annealed grain size to that evolved by preceding warm working (D/D 0 ). The fraction of Σ3 n CSL boundaries sharply rose to approximately 0.5 in the range of D/D 0 from 1 to 5, which can be considered as early stage of continuous post-dynamic recrystallization. Then, the rate of increase in the fraction of Σ3 n CSL boundaries slowed down significantly in the range of D/D 0 > 5. A fivefold increase in the grain size by annealing is a necessary condition to obtain approximately 50% Σ3 n CSL boundaries in the recrystallized microstructure.

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Section: Philosophical Magazine 4183mentioning

confidence: 86%

Σ3 CSL boundary distributions in an austenitic stainless steel subjected to multidirectional forging followed by annealing

Tikhonova

Kuzminova

Fang

et al. 2014

Philosophical Magazine

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“…These precipitates were often characterized by a specific coffee-bean contrast, which indicated their coherence relationship with matrix as can be seen in encircled dispersoid (Fig.1d). A minor fraction of coarser (~25 nm), round-shaped and incoherent Al 6 Mn particles [10] was also found in grain interior (Fig. 1b).…”

Section: Resultsmentioning

confidence: 84%

Friction Stir Welding of an Al-Mg-Sc-Zr Alloy with Ultra-Fined Grained Structure

Malopheyev

Mironov

Kulitskiy

et al. 2014

MSF

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Effect of friction stir welding (FSW) on mechanical properties and microstructure of Al-5.4Mg-0.2Sc-0.1Zr sheets with ultra-fined grained (UFG) structure was studied. The UFG-sheets were produced by equal-channel angular pressing (ECAP) followed either by cold or hot rolling. FSW was found to be very effective for retaining the UFG microstructure as well as constituent coherent nano-scale dispersoids in the welded material. Despite the preservation effect, however, the essential material softening was observed in the weld zone. This was attributed to the recrystallization occurring during FSW. The joint efficiency for yield strength of the obtained friction stir welds was found to be 81% in the hot rolled condition and only 55% in the cold rolled state. The relatively low joint efficiency was associated with the recrystallization softening as well as with the formation of a specific "kissing bond" defect in the stir zone. The joint efficiency is believed may be improved by adjusting of welding conditions and/or tool design.

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“…A Zr-modified commercial AA5083 alloy with a chemical composition of Al-5.4% Mg-0.5% Mn-0.1% Zr-0.12% Si-0.014% Fe (wt%) was fabricated by direct chill casting with a solidification rate of 100 K/s [18]. The ingots were then subjected to a homogenization annealing (HA) treatment at 360 1C for 6 h [18] with the final alloy designated as AA5083ZrHA1.…”

Section: Methodsmentioning

confidence: 99%

“…It is worth noting that ECAP performed at T r200 1C leads to a reduction in the ductility [5][6][7][8][9], which is generally less than that observed when using such techniques as rolling, which is commonly employed to process hardened Al-Mg alloys [1,2,4]. The formation of UFG structures in Al-Mg alloys through intense plastic straining is accompanied by several processes in addition to grain refinement [3,4,[16][17][18]. First, a many-fold increase in the lattice dislocation density takes place [5][6][7][8][9]16].…”

Section: Introductionmentioning

confidence: 99%

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Strengthening mechanisms in a Zr-modified 5083 alloy deformed to high strains

Malopheyev

Kaibyshev

2015

Materials Science and Engineering: A

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Effect of second phase particles on grain refinement during equal-channel angular pressing of an Al–Mg–Mn alloy

Cited by 124 publications

References 32 publications

Σ3 CSL boundary distributions in an austenitic stainless steel subjected to multidirectional forging followed by annealing

Σ3 CSL boundary distributions in an austenitic stainless steel subjected to multidirectional forging followed by annealing

Friction Stir Welding of an Al-Mg-Sc-Zr Alloy with Ultra-Fined Grained Structure

Strengthening mechanisms in a Zr-modified 5083 alloy deformed to high strains

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