Microstructural evolution in copper processed by severe plastic deformation

Mishra, Avanish; Richard, Vincent; Grégori, Fabienne; Asaro, R.J.; Meyers, Marc A.

doi:10.1016/j.msea.2005.08.201

Cited by 101 publications

(41 citation statements)

References 22 publications

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“…11a and b. Clearly a grain refinement has taken place during tribocorrosion due to large shear strain acting in the contact. Indeed similar grain refinement is found in severe plastic deformation processes [12]. Emge et al [13] found similar structures after sliding on copper by using ion channelling on FIB sections.…”

Section: Sem Cross Sectionsmentioning

confidence: 55%

EBSD, SEM and FIB characterisation of subsurface deformation during tribocorrosion of stainless steel in sulphuric acid

Perret

Boehm-Courjault

Cantoni

et al. 2010

Wear

105

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a b s t r a c tThe tribocorrosion behaviour of a 304L stainless steel/alumina contact was investigated in sulphuric acid at two imposed potentials (cathodic and passive). The metal deformation below the surface was investigated by analyzing cross sections using secondary electron microscopy (SEM) and electron back scatter diffraction (EBSD). Cross sections were also prepared using focussed ion beam (FIB) and analyzed by in situ SEM. AES depth profiling was used to analyze surface composition. Metal subsurface deformation resulted in the build up of a deformed layer of approximately 20 m thickness in the near surface zone within the wear track. This layer exhibited a deformation gradient with high deformation close to the surface resulting in grain refinement down to 10 nm. The applied potential influenced the deformation: at passive applied potential more strain was accumulated below the surface resulting in more pronounced grain refinement and higher density of defects. Using AES analysis no alumina transfer from the counter body or any significant burying of oxide below the surface could be detected.

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Section: Sem Cross Sectionsmentioning

confidence: 55%

EBSD, SEM and FIB characterisation of subsurface deformation during tribocorrosion of stainless steel in sulphuric acid

Perret

Boehm-Courjault

Cantoni

et al. 2010

Wear

105

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“…To produce bulk copper materials of the ultrafine grain sizes the following methods are applied: powder metallurgy technique [1][2][3][4][5][6], severe plastic deformation methods, mainly equal-channel angular pressing (ECAP) [7][8][9][10][11], high-pressure torsion (HPT) [12][13][14] and hydrostatic extrusion (HE) [15]. These methods do not proceed continuously, and they seem to be impractical for manufacturing of flat, ultrafine grained materials.…”

Section: Introductionmentioning

confidence: 99%

Ultrafine Grained Strips of Precipitation Hardened Copper Alloys

Stobrawa¹,

Rdzawski²,

Głuchowski³

et al. 2011

Archives of Metallurgy and Materials

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Precipitation strengthened copper belongs to a group of functional and structural materials applied where combination of high electrical conductivity with high strength is required. A growing trend to use the new copper-based functional materials is observed recently world-wide. Within this group of materials particular attention is drawn to those with ultrafine grain size of a copper matrix.This study was aimed to investigate mechanical properties and microstructure in strips of age-hardenable copper alloys processed by continuous repetitive corrugation and straightening (CRCS).Tests were performed on 0.8 mm thick, CuCr0.6 and CuNi2Si1 alloys strips annealed at 650• C for 1 hour. The specially designed construction of die set (toothed rolls and plain rolls set) installed on tensile testing machine was applied for deformation process. The changes of mechanical properties (HV, ultimate tensile strength, 0,2 yield strength) as well as microstructure evolution versus number of deformation cycles were studied. The microstructure was observed with optical and electron microscopes (TEM and SEM equipped with EBSD).The CRCS process effectively reduced the grain size of CuCr0.6 and CuNi2Si1 alloys strips, demonstrating the CRCS as a promising new method for producing ultra-fine grained metallic strips.Keywords: copper alloy, severe plastic deformation, microstructure, mechanical properties Stopy miedzi utwardzane wydzieleniowo należą do grupy materiałów konstrukcyjnych stosowanych w sytuacji, gdzie wymagana jest wysoka elektryczna przewodność właściwa oraz wysokie właściwości wytrzymałościowe. Obecnie obserwuje się w świecie wzrastającą tendencję do stosowania nowych stopów miedzi. W tej grupie materiałów szczególne znaczenie odgrywają stopy cechujące się ultradrobnoziarnistą strukturą osnowy. W pracy badano właściwości mechaniczne oraz mikrostrukturę utwardzanych wydzieleniowo stopów miedzi odkształcanych metodą cyklicznego przeginania i prostowania. Badaniu poddano taśmy ze stopów miedzi CuCr0.6 and CuNi2Si1 o grubości 0,8 mm wyżarzanych w 650• C przez 1 godzinę. Cykliczne przeginanie i prostowanie zrealizowano na skonstruowanym do tego celu stanowisku zainstalowanym na maszynie wytrzymałościowej. Badaniu poddano zmiany właściwości mechanicznych taśmy (twardość HV, wytrzymałość na rozciąganie, umowna granica plastyczności), jak również zmiany mikrostruktury w zależności od ilości cykli deformacji. Badania mikrostruktur prowadzono za pomocą mikroskopii świetlnej i elektronowej (TEM i SEM wyposażony w EBSD)Proces cyklicznego przeginania i prostowania efektywnie zmniejszał wielkość ziaren taśm ze stopów CuCr0.6 CuNi2Si1, rokując dobre nadzieje jako metoda do otrzymywania struktury ultradrobnoziarnistej w płaskich wyrobach walcowanych.

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“…. Experimental study of evolution of microstructure in Cu by Mishra et al (2005) shows that the first few ECAP passes result in an effective grain refinement taking place in successive stages: homogeneous dislocation distribution, formation of elongated sub-cells, formation of elongated subgrains and their following break-up into equiaxed units, while the microstructure tends to be more equiaxed as the number of passes increases. Later on, the sharpening of grain boundaries and final equiaxed ultrafine grain structure develops.…”

Section: Microstructurementioning

confidence: 99%

Mechanical Properties of Copper Processed by Severe Plastic Deformation

Kunz¹

2012

Copper Alloys - Early Applications and Current Performance - Enhancing Processes

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Microstructural evolution in copper processed by severe plastic deformation

Cited by 101 publications

References 22 publications

EBSD, SEM and FIB characterisation of subsurface deformation during tribocorrosion of stainless steel in sulphuric acid

EBSD, SEM and FIB characterisation of subsurface deformation during tribocorrosion of stainless steel in sulphuric acid

Ultrafine Grained Strips of Precipitation Hardened Copper Alloys

Mechanical Properties of Copper Processed by Severe Plastic Deformation

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