Grain refinement in a commercial Al–Mg–Sc alloy under hot ECAP conditions

Sitdikov, Oleg; Sakai, Taku; Avtokratova, Elena; Kaibyshev, Rustam; Kimura, Yuuji; Tsuzaki, Kaneaki

doi:10.1016/j.msea.2006.06.081

Cited by 71 publications

(83 citation statements)

References 47 publications

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“…Other investigations have emphasized the role of continuous dynamic recrystallization (CDRX) in grain refinement under SPD of aluminum alloys at elevated and high temperatures. 3,8,9) This process associates with the formation of low angle boundaries at low strains and their gradual transformation into high angle ones with further straining due to accumulation of lattice dislocations within deformationinduced boundaries. 3,[7][8][9][10] New grains result from the gradual increase in misorientation between subgrains during plastic deformation.…”

Section: )mentioning

confidence: 99%

“…3,8,9) This process associates with the formation of low angle boundaries at low strains and their gradual transformation into high angle ones with further straining due to accumulation of lattice dislocations within deformationinduced boundaries. 3,[7][8][9][10] New grains result from the gradual increase in misorientation between subgrains during plastic deformation. 3,8,9) It is worth noting that CDRX was found to be the mechanism of extensive grain refinement during ECAP, 8,9) and MDF, 7) in an Al-Mg-Sc alloy containing nanoscale coherent Al 3 Sc particles.…”

Section: )mentioning

confidence: 99%

“…3,[7][8][9][10] New grains result from the gradual increase in misorientation between subgrains during plastic deformation. 3,8,9) It is worth noting that CDRX was found to be the mechanism of extensive grain refinement during ECAP, 8,9) and MDF, 7) in an Al-Mg-Sc alloy containing nanoscale coherent Al 3 Sc particles. It was assumed that the coherent dispersoids provide the excellent stability of deformation-induced arrays of LABs that is a prerequisite condition for the completion of CDRX process.…”

Section: )mentioning

confidence: 99%

“…It was assumed that the coherent dispersoids provide the excellent stability of deformation-induced arrays of LABs that is a prerequisite condition for the completion of CDRX process. [7][8][9][10] As a result, these alloys can be processed in semi-finished products with a very high strength and sufficient ductility. This unique combination of strength and ductility, which typically have opposing characteristics, is attributed mainly to the formation of the ultra-fine grained structure under SPD.…”

Section: )mentioning

confidence: 99%

“…3,[7][8][9]14) It is caused by the fact that homogenization annealing at intermediate temperature provides the formation of a dispersion of nanoscale particles of Al 6 Mn. In the 1561 alloy the incoherent nanoscale particle of Al 6 Mn precipitated during annealing at a relatively low temperature of 360 C. No high temperature solution treatment at a temperature of 500 C was performed.…”

Section: Role Of Homogenization Annealingmentioning

confidence: 99%

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Development of Ultra-Fine Grained Structure in an Al-5.4%Mg-0.5%Mn Alloy Subjected to Severe Plastic Deformation

et al. 2011

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It was shown that extensive grain refinement takes place in an as-cast Al-5.4%Mg-0.5%Mn-0.1%Zr alloy subjected to severe plastic deformation under multi-directional forging up to a total true strain of $9 at 250 and 300 C. At a strain of $3, the deformed microstructure is mainly characterized by the formation of new grains along original boundaries and the development of well-defined subgrains within interiors of original grains. Upon further straining the misorientation of deformation-induced boundaries increases; new grains appear homogeneously both within grain interiors and along original boundaries. Decreasing temperature accelerates the transformation of low-angle boundaries (LABs) into high-angle boundaries (HABs). The resulted grain size evolved in this alloy was slightly less than that produced in an Al-6%Mg-0.35%Sc by severe plastic deformation under similar conditions. In addition, in the alloy belonging to Al-Mg-Mn-Zr system the formation of a fully recrystallized structure was found at a lower cumulative strain in comparison with the alloy belonging to Al-Mg-Sc system. This unusual difference associated with the fact that the Al-5.4%Mg-0.5%Mn-0.1%Zr alloy was initially subjected to solution treatment at a relatively low temperature of $360 C. Effect of homogenization annealing on phase composition of this alloy is discussed.

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Section: )mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: Role Of Homogenization Annealingmentioning

confidence: 99%

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Development of Ultra-Fine Grained Structure in an Al-5.4%Mg-0.5%Mn Alloy Subjected to Severe Plastic Deformation

et al. 2011

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Influence of Pressing Temperature on Microstructure Evolution and Mechanical Behavior of Ultrafine‐Grained Cu Processed by Equal‐Channel Angular Pressing

et al. 2011

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Pure Cu was processed by ECAP at five different temperatures from room temperature (RT) to 523 K. The influence of pressing temperature on microstructure evolution and tensile behavior was investigated in detail. The results show that as the ECAP temperature is increased the grain size and ductility both increase whereas the dislocation density and yield strength decrease. In the case of ECAP processing in the range of RT to 473 K the mechanism governing microstructural refinement is continuous dynamic recrystallization (CDRX), whereas at 523 K the mechanism changes to discontinuous dynamic recrystallization (DDRX). At higher ECAP temperatures, the kinetics of CDRX are retarded leading to a lower fraction of equiaxed grains/high‐angle grain boundaries and a higher fraction of dislocation cell structures. At 523 K, DDRX induces a high fraction of equiaxed grains with a very low dislocation density which appears responsible for the observed high tensile ductility. The sample processed at 523 K possessed a good combination of strength and ductility, suggesting that processing by ECAP at elevated temperatures may be a suitable alternative to RT ECAP processing followed by subsequent annealing.

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Anticorrosion behavior of ultrafine-grained Al-26 wt% Si alloy fabricated by ECAP

Jiang

Song

et al. 2012

J Mater Sci

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Grain refinement in a commercial Al–Mg–Sc alloy under hot ECAP conditions

Cited by 71 publications

References 47 publications

Development of Ultra-Fine Grained Structure in an Al-5.4%Mg-0.5%Mn Alloy Subjected to Severe Plastic Deformation

Development of Ultra-Fine Grained Structure in an Al-5.4%Mg-0.5%Mn Alloy Subjected to Severe Plastic Deformation

Influence of Pressing Temperature on Microstructure Evolution and Mechanical Behavior of Ultrafine‐Grained Cu Processed by Equal‐Channel Angular Pressing

Anticorrosion behavior of ultrafine-grained Al-26 wt% Si alloy fabricated by ECAP

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