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2 Journal of Achievements in Materials and Manufacturing Engineering

2 2009

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Microstructure and properties of CuNi2Si1 alloy processed by continuous RCS method

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Stobrawa J. , Rdzawski Z. , Głuchowski W. , Malec W.

2009

tom Vol. 37, nr 2

466-479

Purpose: Precipitation strengthened copper constitutes a group of functional and structural materials used where combination of high electrical conductivity with high strength is required. A growing trend to use new copper-based functional materials is recently observed world-wide. Within this group of materials particular attention is drawn to those with ultrafine grain size of a copper matrix. Design/methodology/approach: This study was aimed to investigate mechanical properties and microstructure in strips of age hardenable CuNi2Si alloy processed by continuous repetitive corrugation and straightening (CRCS). Tests were performed with quenched (900°C/1hour/water) or annealed (650°C /1 hour) 0.8 mm thick strips using original die set construction (toothed rolls and plain rolls set) installed in tensile testing machine. The changes of mechanical properties (HV, ultimate tensile strength, 0.2 yield strength) as well as microstructure evolution versus number of deformation cycles were investigated. The microstructure was investigated by optical and electron microscopy (TEM and SEM equipped with EBSD). Findings: The obtained strengthening effects and observed microstructure changes have been discussed basing on the existing theories related to strengthening of ultra fine grained copper based materials. Practical implications: The CRCS process effectively reduced the grain size of CuNi2Si1 alloy strips especially for annealed material, demonstrating the CRCS as a promising new method for producing ultra fine grained metallic strips. Originality/value: The paper contributes to the mechanical properties of precipitation strengthened ultra fine grained copper - chromium alloy strips obtained by original RCS method and to the microstructure evolution.

Ultrafine grained strips of CuCr0.6 alloy prepared by CRCS method

100%

Stobrawa J. P. , Rdzawski Z. M. , Głuchowski W. , Malec W.

tom Vol. 33, nr 2

166-172

Purpose: The aim of this work was to evaluate the ability of a continuous repetitive corrugation and straightening (CRCS) technique in creating ultra fine grained copper-chromium strips as well as to determine their deformability, mechanical properties, deformation behaviour and microstructure evolution. Design/methodology/approach: Tests were performed with the 0.8 mm thick CuCr0.6 strips using original die set construction. The changes of mechanical properties as well as microstructure evolution versus number of deformation cycles were investigated. The microstructure was investigated using optical and electron microscopy (TEM and SEM equipped with EBSD). Findings: The obtained strengthening effects and observed microstructure changes have been discussed basing on the existing theories related to strengthening of ultra fine grained copper based materials. The CRCS process effectively reduced the grain size of a CuCr0.6 alloy strips, demonstrating the CRCS as a promising new method for producing ultra fine grained metallic strips. Research limitations/implications: Research results are limited to the initial material after annealing only. Further investigations should be aimed towards determination of CRCS sequence including deformation-precipitation-ageing influence on strengthening effect. Practical implications: A growing trend to use new copper-based functional materials is observed recently world-wide. Within this group of materials particular attention is drawn to those with ultra fine or nanometric grain size of a copper matrix, which exhibit higher mechanical properties than microcrystalline copper. Originality/value: The paper describes to the mechanical properties of precipitates strengthened ultra fine grained copper - chromium alloy strips obtained by original RCS method and to the microstructure evolution.