Characterization of ultrafine grained Cu-Ni-Si alloys by electron backscatter diffraction

Altenberger, I.; Kuhn, H.-A.; Gholami, M.; Mhaede, Mansour; Wagner, Lothar

doi:10.1088/1757-899x/63/1/012135

Cited by 10 publications

(16 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Backscatter (ECCI, electron channeling contrast imaging) electron microscopy [11,12] was carried out using an AsB (Angle Selective Detector, Zeiss, Oberkochen, Germany) [13] in a Zeiss ULTRA scanning electron microscope (SEM, Zeiss, Oberkochen, Germany) equipped with a thermal field emission cathode. Typically, an aperture lens of 120 µm and acceleration voltages of 15-20 kV at a working distance of 2-6 mm were used.…”

Section: Methodsmentioning

confidence: 99%

Ultrafine-Grained Precipitation Hardened Copper Alloys by Swaging or Accumulative Roll Bonding

Altenberger

Kuhn

Gholami

et al. 2015

Metals

View full text Add to dashboard Cite

Abstract:There is an increasing demand in the industry for conductive high strength copper alloys. Traditionally, alloy systems capable of precipitation hardening have been the first choice for electromechanical connector materials. Recently, ultrafine-grained materials have gained enormous attention in the materials science community as well as in first industrial applications (see, for instance, proceedings of NANO SPD conferences). In this study the potential of precipitation hardened ultra-fine grained copper alloys is outlined and discussed. For this purpose, swaging or accumulative roll-bonding is applied to typical precipitation hardened high-strength copper alloys such as Corson alloys. A detailed description of the microstructure is given by means of EBSD, Electron Channeling Imaging (ECCI) methods and consequences for mechanical properties (tensile strength as well as fatigue) and electrical conductivity are discussed. Finally the role of precipitates for thermal stability is investigated and promising concepts (e.g. tailoring of stacking fault energy for grain size reduction) and alloy systems for the future are proposed and discussed. The relation between electrical conductivity and strength is reported.

show abstract

Section: Methodsmentioning

confidence: 99%

Ultrafine-Grained Precipitation Hardened Copper Alloys by Swaging or Accumulative Roll Bonding

Altenberger

Kuhn

Gholami

et al. 2015

Metals

View full text Add to dashboard Cite

show abstract

“…Thus Cu-Ni-Si materials with very fine grain sizes in the range 0,2-2 µm can be produced. EBSD and electron channeling contrast in the SEM are very helpful tools to characterize such microstructures [11]. Swaging and accumulative roll bonding, typically lead to a maximum hardness at a logarithmic strain or deformation degree of 2.5 and 5, respectively.…”

Section: Discussionmentioning

confidence: 99%

Ultrafine-Grained High Strength Cu-Ni-Si Alloys

Altenberger

Kuhn

Gholami-Kermanshahi

et al. 2017

MSF

View full text Add to dashboard Cite

Abstract. Ultrafine-grained (UFG) pure copper has been in the focus of materials scientists over the last two decades, however ultrafine-grained high-strength copper alloys have scarcely been processed or characterized so far industrially. In this contribution, UFG copper alloys, especially Cu-Ni-Si alloys, being well known as ideal materials for electromechanical connectors, springs and leadframes, are presented. Precipitation hardened Cu-Ni-Si alloys are a well established and technologically important class of materials for a wide range of applications where high strength and good conductivity are required. Yield strength and fatigue properties of metallic alloys can be significantly enhanced by severe plastic deformation methods. In contrast to other strengthening methods such as solid solution hardening, severe plastic deformation leads to a weaker decrease of electrical conductivity and is therefore a means of enhancing strength while maintaining acceptable conductivity for current bearing parts and components. Characterization of these materials after severe plastic deformation by swaging, wire drawing and subsequent aging was carried out using conductivity-, hardness-and tensile tests as well as highly-resolved microstructural characterization methods. The results reveal that UFG low alloyed copper alloys exhibit impressive combinations of properties such as strength, conductivity, high ductility as well as acceptable thermal stability at low and medium temperatures. By a subsequent aging treatment the severely plastically deformed microstructure of Cu-Ni-Si alloys can be further enhanced and thermal stability can profit from grain-boundary pinning by precipitated nanoscale nickel silicides.

show abstract

“…Wider possibilities for reaching preferred mechanical properties and electric conductivity can be achieved in these alloys by application of technologies of cold deformation and in combination with different variants of supersaturation and ageing processes [7][8][9][10][11][12]. In recent years, processes that use strong and complex plastic deformation (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, processes that use strong and complex plastic deformation (i.e. SPD -severe plastic deformation) are becoming widely used in manufacturing [2,[10][11][12]. These processes are widely used in production of components of pure copper and solution strengthened copper but there are not much studies of fabrication of components from precipitation hardened copper alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Combined Heat Treatment and Severe Plastc Deformation on the Microstructure of Cunisi Alloy

Głuchowski

Rdzawski

Sobota

et al. 2016

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

The aim of this work was to study the microstructure and functional properties of CuNi2Si1 alloy. The material was prepared classically by melting, casting, hot rolling and cold rolling. The obtained strips were processed with combined operations of supersaturation, ageing and one of the intensive deformation method -repetitive corrugation and straightening. The efficiency of RCS operation in shaping of functional properties in precipitation hardened copper alloys depends not only on tool geometry and operating parameters but also on whether and at what stage of strip production the supersaturation operation was applied. Application of the supersaturation before RCS operation broadens the potential to shape the set of functional properties. Comparable functional properties of the precipitation hardened copper alloy strips can be reached without application of the supersaturation operation in their manufacturing processes. The process of RCS applied after annealing, and the potentially slightly lower mechanical properties would be compensated by higher electrical conductivity.

show abstract

Characterization of ultrafine grained Cu-Ni-Si alloys by electron backscatter diffraction

Cited by 10 publications

References 9 publications

Ultrafine-Grained Precipitation Hardened Copper Alloys by Swaging or Accumulative Roll Bonding

Ultrafine-Grained Precipitation Hardened Copper Alloys by Swaging or Accumulative Roll Bonding

Ultrafine-Grained High Strength Cu-Ni-Si Alloys

Effect of the Combined Heat Treatment and Severe Plastc Deformation on the Microstructure of Cunisi Alloy

Contact Info

Product

Resources

About