Enhanced grain refinement due to deformation-induced precipitation during ambient-temperature severe plastic deformation of an Al–7%Si alloy

García-Infanta, J.M.; Cepeda-Jiménez, C.M.; McNelley, Terry R.; Ruano, Oscar Antonio; Carreño, Fernando

doi:10.1016/j.jallcom.2008.11.047

Cited by 35 publications

(27 citation statements)

References 19 publications

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“…In prior work [6], it was shown that these fine grains evolve by processes of dislocation reaction and grain subdivision in the primary a. Also, it has been shown that these fine grains are stabilized by fine Si precipitation on their boundaries [7]. Indeed, precipitation of fine Si particles 10-50 nm in size is shown in the SE images in Fig.…”

Section: Resultsmentioning

confidence: 78%

“…While highly refined grains were observed within the primary a constituent, the Si particles remained within the eutectic constituent and were not redistributed into the primary despite a cumulative shear strain 16 (corresponding to a von Mises equivalent strain [9.0). Altogether, these observations suggest that non-deforming particles are not being redistributed during SPD at ambient temperature [5][6][7].…”

Section: Introductionmentioning

confidence: 77%

“…Details of the alloy preparation and ECAP processing have been given previously [5][6][7]. Briefly, 99.99% Al and an Al-12.3%Si master alloy were melted in the required proportions, and a nominal 0.02% Na addition was also made in order to modify the Si particle morphology and to refine Si particle size in the eutectic constituent.…”

Section: Methodsmentioning

confidence: 99%

“…pct.) by repetitive ECAP [5][6][7]. The as-cast microstructure in this alloy comprises primary and eutectic constituents in a dendritic solidification microstructure.…”

Section: Introductionmentioning

confidence: 99%

“…A 0.02% Na addition results in a refined eutectic constituent that contains mainly irregular Si particles although there is a small fraction of Al 5 FeSi needle-like particles. In this recent work, the eutectic constituent in alloy provided a marker that delineated the shape change in the microstructure during repetitive ECAP [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Strain path and microstructure evolution during severe deformation processing of an as-cast hypoeutectic Al–Si alloy

et al. 2010

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Microstructure evolution in an as-cast Na modified Al-7%Si (wt. pct.) alloy was examined during redundant and monotonic straining by repetitive equichannel angular pressing (ECAP) under ambient temperature conditions, and during friction stir processing (FSP). Redundant straining during repetitive ECAP was accomplished by processing following route B C while monotonic straining employed route A. Single-and multi-pass FSP was conducted on this same as-cast material using an FSP tool having a threaded pin. The as-cast microstructure comprises equiaxed primary a dendrite cells embedded in the Al-Si eutectic constituent. The evolution of this microstructure during repetitive ECAP can be described by idealized models of this process. The primary and eutectic constituents can still be discerned and the Si particle distribution is not homogenized even during ambient temperature processing involving von Mises strains [9.0. In contrast, the primary and eutectic constituents cannot be distinguished in the stir zone after even a single FSP pass. Strain estimates based on the shape change of the primary a constituent indicate that the Si particle distribution has become homogeneous at local von Mises strains of 2.5-3.0 during the FSP thermomechanical cycle. Mechanical property data are consistent with strain path during SPD processing by repetitive ECAP and FSP.

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Section: Resultsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 77%

Section: Methodsmentioning

confidence: 99%

“…pct.) by repetitive ECAP [5][6][7]. The as-cast microstructure in this alloy comprises primary and eutectic constituents in a dendritic solidification microstructure.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Strain path and microstructure evolution during severe deformation processing of an as-cast hypoeutectic Al–Si alloy

et al. 2010

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Effect of Severe Plastic Deformation and Subsequent Silicon Spheroidizing Treatment on the Microstructure and Mechanical Properties of an Al–Si–Mg Alloy

et al. 2017

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This study investigated the synergetic effects of severe plastic deformation and subsequent heat treatment on the characteristics of an A356 alloy. The severe deformation by accumulative back extrusion (ABE) at 300 C substantially refined the a-Al primary phase and Si particles, but did not homogeneously redistribute the Si particles. ABE also improved the strength but did not enhance the ductility. To make a compromise between strength and ductility, a subsequent heat treatment at 540 C was carried out. It was shown that severe plastic deformation substantially accelerated the silicon spheroidization. Heat treatment increased the ductility of the material from $8% (in the deformed condition) to $15%. This was discussed with emphasis on restoration of the matrix, spheroidization of the Si particles, and redistribution of the Si particles within the a-Al matrix.

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Progress in Severe Plastic Deformation of Metastable Beta Ti Alloys

Zafari

Xia

2019

Adv Eng Mater

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Metastable β Ti alloys can undergo martensitic transformation under stress. It is shown that such stress‐induced martensitic transformation (SIMT) can significantly facilitate grain refinement by severe plastic deformation (SPD), achieving β grain sizes of <50 nm, compared with >100 nm in β Ti alloys without SIMT. The martensitic α″ formed partitions the β grains and blocks dislocation movement, but undergoes reverse transformation back into β at large strains, leaving a pure β grain structure. The grain refinement can be further enhanced by increasing the strain rate to the order of 10–100 s−1, leading to β grains of <10 nm. SPD also has significant effect on the morphology of the α precipitates upon aging, transforming it from acicular to equiaxed. Although the α nucleus formed between recrystallized β grains of <≈10 nm follows the Burgers orientation relationship (BOR), the semicoherent interface is lost upon β grain growth during aging, causing its growth into equiaxed shape.

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Enhanced grain refinement due to deformation-induced precipitation during ambient-temperature severe plastic deformation of an Al–7%Si alloy

Cited by 35 publications

References 19 publications

Strain path and microstructure evolution during severe deformation processing of an as-cast hypoeutectic Al–Si alloy

Strain path and microstructure evolution during severe deformation processing of an as-cast hypoeutectic Al–Si alloy

Effect of Severe Plastic Deformation and Subsequent Silicon Spheroidizing Treatment on the Microstructure and Mechanical Properties of an Al–Si–Mg Alloy

Progress in Severe Plastic Deformation of Metastable Beta Ti Alloys

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