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Ductility minimum temperature phenomenon in as cast CuNi25 alloy

100%

Nowosielski R. , Sakiewicz P. , Mazurkiewicz J.

tom Vol. 17, nr 1-2

193--196

Purpose: The aim of this paper was to present DMT phenomenon in CuNi25 alloy and describe behavior of as cast alloy during high temperature tensile tests for different strain rates. Design/methodology/approach: Numerous techniques were used to characterize properties of material: high temperature tensile tests, light microscope, scanning electron microscopy (SEM), transmission electron microscopy (TEM). Linear and point analysis of concentration executed with the help of X-ray microanalysis. Findings: It was determine from the experimental studies the course of elongation and reduction of area curves for different strain rates. Their was analyze morphology of material in the range of 300-650°C. Research limitations/implications: Further studies should be undertaken in order to correlate effects, processes and mechanism existing and superimpose in material in range of Ductility Minimum Temperature phenomenon and what should help us understand high temperature properties of mentioned material. Practical implications: Knowledge about material properties during high temperature deformation leads to selection appropriate production parameters. Misapplication of parameters leads to multiplication of costs and often destruction of material during production or operating. Correct selection of technical and economical parameters of material production give us supremacy in economic and technological competition. Originality/value: Investigations of this as cast CuNi25 alloy complete ours knowledge about mechanical properties and help us to develop correct parameters for more effective technologies for material production.

Influence of plastic deformation temperature on the structure and mechanical properties of low-alloy copper alloys with Co, Ni and B

100%

Grzegorczyk B. , Ozgowicz W.

tom Vol. 84, nr 2

49--57

Purpose: This work presents the influence of chemical composition and plastic deformation temperature of CuCoNi and CuCoNiB as well as CuCo2 and CuCo2B alloys on the structure, mechanical properties and, especially on the inter-crystalline brittleness phenomenon and ductility minimum temperature effect in tensile testing with strain rate of 1.2·10-3 s-1 in the range from 20°C to 800°C. Design/methodology/approach: The tensile test of the investigated copper alloys was realized in the temperature range of 20-800°C with a strain rate of 1.2·10-3 s–1 on the universal testing machine. Metallographic observations of the structure were carried out on a light microscope and the fractographic investigation of fracture on an electron scanning microscope. Findings: Low-alloy copper alloys such as CuCo2 and CuCo2B as well as CuCoNi and CuCoNiB show a phenomenon of minimum plasticity at tensile testing in plastic deforming temperature respectively from 500°C to 700°C for CuCo2, from 450°C to 600°C for CuCo2B and from 450°C to 600°C for CuCo2B and from 500°C to 600°C for CuCoNiB. Practical implications: In result of tensile tests of copper alloys it has been found that the ductility minimum temperature of the alloys equals to about 500°C. At the temperature of stretching of about 450°C the investigated copper alloys show maximum strength values. Originality/value: Based on the test results the temperature range for decreased plasticity of CuCoNi and CuCoNiB as well as CuCo2 and CuCo2B alloys was specified. This brittleness is a result of decreasing plasticity in a determined range of temperatures of deforming called the ductility minimum temperature.