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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2007

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Grain refining of Cu and Ni-Ti shape memory alloys by ECAP process

Greger M., Kocich R., Cizek L.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 20, nr 1-2

247-250

Purpose: This paper was aimed at verification of functionality of the ECAP technology at extrusion of the copper and Ni-Ti alloys. Design/methodology/approach: Cross-section of original samples was 8 x 8 mm and their length was 32 mm. The samples of Cu were extruded at room temperature. For the samples of Ni-Ti alloys was used the two-stage pressing, when the samples were extruded at temperature of approx. T1 = 520 degrees centigrade and T2 = 420 degrees centigrade. In order to increase the concentration of deformation in volume of the sample, the samples were turned around their longitudinal axis by 90 degrees after individual passes and they were extruded again. Analysis of structure was made by using of light microscopy. Findings: deformation forces were measured during extrusion, resistance to deformation was calculated and deformation speed was approximately determined. After individual passes there is occured an accumulation of deformation strengthening (tau3 = 745 Mpa). Research limitations/implications: Microstructure depends on experimental conditions, particularly on number of passes and on rotation of the sample between individual passes. Orginality/value: SPD techniques as ECAP process can be used for non-ferrous metals like Ti, Cu. It was approved that elevated temperature provide a successfully conditions for the fine grained final materials obtaining.