Microstructure and room temperature hardening of ultra-fine-grained oxide-dispersion strengthened copper prepared by cryomilling

Kudashov, D. V.; Baum, H.; Martin, Ulrich; Heilmaier, Martin; Oettel, H.

doi:10.1016/j.msea.2004.05.049

Cited by 70 publications

(22 citation statements)

References 12 publications

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“…[24] Based on the preceding viewpoint, uniform strain during deformation of UFG materials can be obtained by controlling instability and delaying the necking process. [1,2,24,25] One plausible approach in the attempt to control instability is to obtain UFG structure with bimodal grain size distribution. In this case, the preferential accommodation of strain in large grains will provide a good strength-ductility combination; and second, the bimodal grain size distribution will allow significant strain hardening to take place, curbing localized deformation.…”

Section: Introductionmentioning

confidence: 99%

Nanograined/Ultrafine-Grained Structure and Tensile Deformation Behavior of Shear Phase Reversion-Induced 301 Austenitic Stainless Steel

Misra

Nayak

Venkatasurya

et al. 2010

Metall Mater Trans A

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We describe here an electron microscopy study of shear reversion-induced nanograined/ultrafine-grained (NG/UFG) structure and evolution of tensile strained microstructure in metastable type 301 austenitic stainless steel. The NG/UFG structure with grain size in the range of 200 to 500 nm was obtained by severe cold deformation and controlled annealing in the narrow temperature range of 973 to 1073 K (700 to 800°C). The different stages of annealing involve the following: (a) transformation of strain-induced martensite to highly dislocated lath-type austenite, (b) formation of dislocation-cell structure and transformation to recovered austenite structure with defect-free subgrains, and (c) coalescence of subgrains to form a NG/UFG structure concomitant with a completely recrystallized structure, and consistent with martensitic shear-type phase reversion mechanism. The optimized cold working and annealing treatment resulted in NG/UFG material with a high yield strength (~1000 MPa) and high ductility (~30 pct) combination. Multiple deformation mechanisms were identified from postmortem electron microscopy examination of tensile strained NG/UFG 301 austenitic stainless steel and include dislocation glide and twinning. The evidence of heterogeneous nucleation of overlapping stacking faults and partial dislocations points toward deformation

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Section: Introductionmentioning

confidence: 99%

Nanograined/Ultrafine-Grained Structure and Tensile Deformation Behavior of Shear Phase Reversion-Induced 301 Austenitic Stainless Steel

Misra

Nayak

Venkatasurya

et al. 2010

Metall Mater Trans A

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show abstract

“…[24] Thus, to obtain high uniform strain during deformation of UFG materials, the strain hardening ability is required as a stabilizing effect to control the instability and to delay/diffuse necking. [1,2,24,25] One approach to control instability is to obtain the UFG structure with a bimodal grain size distribution. First, the preferential accommodation of strain in large grains would lead to a good strength-ductility combination.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Deformation Behavior of Phase-Reversion-Induced Nanograined/Ultrafine-Grained Austenitic Stainless Steel

Misra

Nayak

Mali

et al. 2009

Metall Mater Trans A

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Materials with submicron to nanometer-sized grains by virtue of their high grain boundary area to grain size ratio provide valuable tools for studying deformation behavior in ultrafine-grained structures. In this regard, the well-known strain-induced martensite transformation and its reversal to the parent austenite phase were used to produce nanograins/ultrafine grains via controlled annealing of heavily cold-worked metastable austenite. The results of the electron microscopy study of phase-reversion-induced microstructure and deformation behavior of nanograined/ultrafine-grained (NG/UFG) austenitic stainless steel during tensile straining are described here. The phase-reversion-induced structure was observed to depend on the cold rolling reduction and temperature-time annealing cycle. The optimized structure consisted of nanocrystalline (d < 100 nm), ultrafine (d % 100 to 500 nm), and submicron (d % 500 to 1000 nm) grains and was characterized by a high yield strength (800 to 1000 MPa)-high ductility (30 to 40 pct) combination. Austenite nucleation during phase-reversion annealing occurred in the form of thin plates or as equiaxed grains along the martensite laths. Twinning and dislocation glide were identified as the primary deformation mechanisms, where twinning had a varied character. However, the high elongation seems to be associated with the gradual transformation of metastable austenite, with twinning having only a minor contribution.

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“…For such applications an optimal combination of mechanical strength at room temperature and creep properties at elevated temperatures is desirable. In a preceding paper [4], we have described the manufacturing and microstructural characterization of ultrafine-grained (UFG) copper strengthened by 3 vol.% of nanosized, incoherent yttrium and calcium oxide dispersoids, respectively. While in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…While in Ref. [4], the room temperature compressive properties of the UFG ODS copper was characterized and interpreted in terms of actual models for ambient temperature strengthening, it is the aim of the present contribution to extend the characterization and modelling to the elevated temperature deformation behaviour by utilizing constant compression rate tests in the temperature * Corresponding author. range from 500 • C (0.57T m ) to 700 • C (0.71T m ) at strain rates ranging from 10 −6 to 10 −2 s −1 .…”

Section: Introductionmentioning

confidence: 99%

Creep behaviour of ultrafine-grained oxide dispersion strengthened copper prepared by cryomilling

Kudashov

Heilmaier

Oettel

2004

Materials Science and Engineering: A

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Microstructure and room temperature hardening of ultra-fine-grained oxide-dispersion strengthened copper prepared by cryomilling

Cited by 70 publications

References 12 publications

Nanograined/Ultrafine-Grained Structure and Tensile Deformation Behavior of Shear Phase Reversion-Induced 301 Austenitic Stainless Steel

Nanograined/Ultrafine-Grained Structure and Tensile Deformation Behavior of Shear Phase Reversion-Induced 301 Austenitic Stainless Steel

Microstructure and Deformation Behavior of Phase-Reversion-Induced Nanograined/Ultrafine-Grained Austenitic Stainless Steel

Creep behaviour of ultrafine-grained oxide dispersion strengthened copper prepared by cryomilling

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