Ultrafine grain development in copper during multidirectional forging at 195 K

Kobayashi, Chihiro; Sakai, Taku; Belyakov, Andrey; Miura, Hiromi

doi:10.1080/09500830701566016

Cited by 96 publications

(81 citation statements)

References 32 publications

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“…The continuous increase in misorientations between (sub)grain boundaries evolved during deformation is an essential feature of cDRX, and the kinetics can be discussed by using the relationship between the average (sub)grain boundary misorientation (θ AV ) and total accumulated strain . The θ AV -ε relationships for Al alloy 2219 ECAPed at 523 K (Mazurina et al, 2008), a pure Cu MDFed at 195 K to 473 K (Gao et al, 1999, Belyakov et al, 2001, Kobayashi et al, 2007 and Mg alloy AZ31 compressed at 673 K are represented in Fig. 8.…”

Section: Mechanisms Of Grain Refinement In Mg Alloymentioning

confidence: 99%

Mechanical Properties of Fine-Grained Magnesium Alloys Processed by Severe Plastic Forging

Sakai¹,

Miura²

2011

Magnesium Alloys - Design, Processing and Properties

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Section: Mechanisms Of Grain Refinement In Mg Alloymentioning

confidence: 99%

Mechanical Properties of Fine-Grained Magnesium Alloys Processed by Severe Plastic Forging

Sakai¹,

Miura²

2011

Magnesium Alloys - Design, Processing and Properties

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“…The faster kinetics of grain refinement at higher temperature may be attributed to facilitating the dynamic recovery at elevated temperature, which increases the number of GNBs that are able to acquire high-angle misorientation. Increasing temperature can accelerate full release of internal stresses, which are evolved by plastic working, and promote the dislocation rearrangement in the strain-induced boundaries, leading to the formation of perfect grain boundaries, much as early annealing changes the microstructure of severely deformed samples [52]. Note that the deformation microstructures are somewhat characterized by heterogeneities.…”

Section: Ultrafine Grain Developmentmentioning

confidence: 99%

Grain refinement in a Cu–Cr–Zr alloy during multidirectional forging

Shakhova

Yanushkevich

Fedorova

et al. 2014

Materials Science and Engineering: A

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a b s t r a c tStructural changes during plastic deformation were studied in a Cu-0.3%Cr-0.5%Zr alloy subjected to multidirectional forging up to a total strain of 4 at the temperatures of 300 K and 673 K. The deformation behavior was characterized by a rapid increase in the flow stress at an early deformation followed by a steady-state flow at large strain. The development of the new ultrafine grains resulted from the progressive increase in the misorientations of the strain-induced low-angle boundaries, which evolve into high-angle boundaries with increasing cumulative strain through a strain-induced continuous reaction that is quite similar to continuous dynamic recrystallization. The formation of ultrafine grains was closely related to the development of geometrically necessary boundaries that is attributed to deformation banding. The grain refinement kinetics increased with an increase in the deformation temperature. At 673 K, the area fractions of the ultrafine grains with a size below 2 μm were 0.36 and 0.6 in the initially solution treated samples and the aged samples, respectively. However, the area fractions of the ultrafine grains did not exceed 0.2 at 300 K.

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“…In this case, the development of new grains may take place only in accordance with cDRX mechanism operating during ECAP. It should be noted that severe plastic deformation at high temperature can remarkably accelerate recovery processes 23,24) and promote strain-induced grain formation.…”

Section: Influence Of Interpass Exposure Timementioning

confidence: 99%

Influence of Processing Regimes on Fine-Grained Microstructure Development in an Al–Mg–Sc Alloy by Hot Equal-Channel Angular Pressing

et al. 2012

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Grain refinement during equal-channel angular pressing (ECAP) was studied in a commercial Al5.8%Mg0.3%Sc alloy at temperatures from 473 to 723 K (³0.50.8T m ). The samples were quenched in water in every ECAP pass, which is a conventional cyclic process. ECAP to ¾ = 12 resulted in ultrafine-grained structures developed uniformly at high strains at 473 and 723 K, while processing at 573 K led to the evolution of a duplex grain structure containing partially much coarser grains. In contrast, ECAP process continuously carried out to ¾ = 12 without interruption at 573 K, resulted in development of a uniform ultrafine-grained structure. Effects of processing regimes on microstructural evolution in the AlMgSc alloy are discussed.

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Ultrafine grain development in copper during multidirectional forging at 195 K

Cited by 96 publications

References 32 publications

Mechanical Properties of Fine-Grained Magnesium Alloys Processed by Severe Plastic Forging

Mechanical Properties of Fine-Grained Magnesium Alloys Processed by Severe Plastic Forging

Grain refinement in a Cu–Cr–Zr alloy during multidirectional forging

Influence of Processing Regimes on Fine-Grained Microstructure Development in an Al–Mg–Sc Alloy by Hot Equal-Channel Angular Pressing

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Ultrafine grain development in copper during multidirectional forging at 195 K

Cited by 96 publications

References 32 publications

Mechanical Properties of Fine-Grained Magnesium Alloys Processed by Severe Plastic Forging

Mechanical Properties of Fine-Grained Magnesium Alloys Processed by Severe Plastic Forging

Grain refinement in a Cu–Cr–Zr alloy during multidirectional forging

Influence of Processing Regimes on Fine-Grained Microstructure Development in an Al&ndash;Mg&ndash;Sc Alloy by Hot Equal-Channel Angular Pressing

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Influence of Processing Regimes on Fine-Grained Microstructure Development in an Al–Mg–Sc Alloy by Hot Equal-Channel Angular Pressing