A new mechanism of work hardening in the late stages of large strain plastic flow in F.C.C. and diamond cubic crystals

Argon, A. S.; Haasen, P.

doi:10.1016/0956-7151(93)90058-z

Cited by 187 publications

(71 citation statements)

References 28 publications

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“…31,32) The misorientation across such subboundaries is expected to rise rapidly due to accumulation of misfit dislocations that are resulted from the difference in dislocation slip in neighbor subgrains. 33) Further processing results in rearrangement of the dense dislocation walls, which become almost parallel to the deformation axis ( Fig. 1(b)).…”

Section: Deformation Microstructuresmentioning

confidence: 99%

Regularities of Deformation Microstructures in Ferritic Stainless Steels during Large Strain Cold Working

Belyakov¹,

Tsuzaki²,

Kimura³

2008

ISIJ Int.

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Section: Deformation Microstructuresmentioning

confidence: 99%

Regularities of Deformation Microstructures in Ferritic Stainless Steels during Large Strain Cold Working

Belyakov¹,

Tsuzaki²,

Kimura³

2008

ISIJ Int.

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“…8. It is evident that the relation of θ to strain can be divided into three stages at all experimental conditions following strain hardening theory [37][38][39]. Initially, the value of θ is positive at low strains when dislocation accumulation is dominant.…”

Section: The Work Hardening Ratesmentioning

confidence: 99%

Effect of ECAP processing on microstructure evolution and dynamic compressive behavior at different temperatures in an Al-Zn-Mg alloy

Afifi

Pereira

Wang

et al. 2017

Materials Science and Engineering: A

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An artificially aged Al-Zn-Mg alloy with a grain size of ~ 1.3 m was processed by equalchannel angular pressing (ECAP) and then subjected to dynamic compression at a strain rate of 4000 s -1 in the range from room temperature to 673 K. The results show the η phase is refined and a η phase is formed during the first pass of ECAP and after further processing 8 passes the GP zones are removed. An ultrafine-grained (UFG) structure with an average grain size of ~200 nm was obtained after 4 passes. It is shown that dynamic compressive deformation assists the precipitation process through precipitate coalescence and by changing the precipitate orientations.The dynamic compressive yield strengths and flow stresses decrease gradually to different degrees with increasing temperature except after ECAP processing for 4 passes where there is thermal stability up to 473 K. The ECAP processing significantly improves the strength of the alloy at elevated temperatures by comparison with the as-received material.

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“…Such models are usually based on a single state variable (e.g., the overall dislocation density) [36][37][38][39] or several state variables related to the density and type of dislocations. [40][41][42][43][44][45][46][47] In the present work, the one-parameter model based on dislocation density developed by Yoshie et al [48] and expanded upon by Laasraoui and Jonas [49] was employed. The model is based on the assumption that dynamic recovery is the only softening mechanism, for reasons mentioned previously.…”

Section: Flow Behavior Prior To Spdmentioning

confidence: 99%

Strain-path effects on the evolution of microstructure and texture during the severe-plastic deformation of aluminum

Salem

Langdon

McNelley

et al. 2006

Metall Mater Trans A

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Microstructure and texture evolution during the severe-plastic deformation (SPD) of unalloyed aluminum were investigated to establish the effect of processing route and purity level on grain refinement and subgrain formation. Two lots of aluminum with different purity levels (99.998 pct Al and 99 pct Al) were subjected to large plastic strains at room temperature via four different deformation processes: equal-channel angular extrusion (ECAE), sheet rolling, conventional conical-die extrusion, and uniaxial compression. Following deformation, microstructures and textures were determined using orientation-imaging microscopy. In commercial-purity aluminum, the various deformation routes yielded an ultrafine microstructure with a ;1.5-mm grain size, deduced to have been formed via a dynamic-recovery mechanism. For high-purity aluminum, on the other hand, the minimum grain size produced after the various routes was ;20 mm; the high fraction of high-angle grain boundaries (HAGBs) and the absence of subgrains/deformation bands in the final microstructure suggested the occurrence of discontinuous static recrystallization following the large plastic deformation at room temperature. The microstructure differences were underscored by the mechanical properties following four ECAE passes. The yield strength of commercial-purity aluminum quadrupled, whereas the high-purity aluminum showed only a minor increase relative to the annealed condition.

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A new mechanism of work hardening in the late stages of large strain plastic flow in F.C.C. and diamond cubic crystals

Cited by 187 publications

References 28 publications

Regularities of Deformation Microstructures in Ferritic Stainless Steels during Large Strain Cold Working

Regularities of Deformation Microstructures in Ferritic Stainless Steels during Large Strain Cold Working

Effect of ECAP processing on microstructure evolution and dynamic compressive behavior at different temperatures in an Al-Zn-Mg alloy

Strain-path effects on the evolution of microstructure and texture during the severe-plastic deformation of aluminum

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