Fine-grained alloys by thermomechanical processing

Humphreys, F.J.; Prangnell, P.B.; Priestner, R.

doi:10.1016/s1359-0286(00)00020-6

Cited by 112 publications

(42 citation statements)

References 31 publications

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“…However, recent investigations suggest that the formation process of the UFGs is not conventional discontinuous recrystallization but continuous recrystallization (or in-situ recrystallization) characterized by ultrafine grain subdivision, recovery to form clear UFGs, and short range grain boundary migration. [37,38] The ARB processed materials having the elongated UFG structures perform very high strength. [1,3,21,24,25,27,31,32] The grain size and the tensile strength of the various UFG materials fabricated by the ARB are summarized in Table 2.…”

Section: Arb Processed Materialsmentioning

confidence: 99%

ARB (Accumulative Roll‐Bonding) and other new Techniques to Produce Bulk Ultrafine Grained Materials

et al. 2003

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Accumulative roll‐Bonding (ARB) is a severe plastic deformation (SPD) process invented by the authors in order to fabricate ultrafine grained metallic materials. ARB is the only SPD process applicable to continuous production of bulky materials. In the process, 50 % rolled material is cut into two, stacked to be the initial dimension and then rolled again. In order to obtain one‐body solid material, the rolling in ARB is not only a deformation process but also a bonding process (roll‐bonding). By repeating this procedure, SPD of bulky materials can be realized. In this review paper, various kinds of new SPD mechanical properties of the ARB processed materials are indicated.

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Section: Arb Processed Materialsmentioning

confidence: 99%

ARB (Accumulative Roll‐Bonding) and other new Techniques to Produce Bulk Ultrafine Grained Materials

et al. 2003

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“…On the other hand, a microstructure containing high-angle grain boundaries (HAGBs) may evolve continuously during large plastic deformation under cold-or warm-working conditions producing an ultra-fine-grained material via a process sometimes known as continuous recrystallization. [6,7] The effectiveness of different deformation processes on grain refinement and subsequent mechanical behavior has been the focus of many investigations. Even for a given process (e.g., ECAE), the effect of deformation route on microstructure evolution is still not totally clear.…”

Section: Introductionmentioning

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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“…For instance, in metallic systems the yield stress decreases with increasing grain size over a considerable range as described by the well-known Hall-Petch equation [1]. The grain boundaries may act as obstacles for moving dislocations, leading to a pile-up of dislocations in front of the boundary.…”

Section: Introductionmentioning

confidence: 99%