FEM simulation of Ductility Minimum Temperature (DMT) phenomenon in CuNi25 alloy

Purpose: The aim of this paper was to check by three dimensional Finite Element Method simulations the possibility of existence the non-uniform deformation hypothesis as a cause of Ductility Minimum Temperature phenomenon (DMT) in CuNi25 alloy. The necessary information and mechanical properties have been collected during elevated temperature tensile tests and other research and analysis of microstructure changes in material after deformation at the range of DMT existence. Experimental results were compared with three dimensional finite element method (FEM) simulation. Design/methodology/approach: Numerous techniques were used to characterize properties of material: high temperature tensile tests, finite element method, transmission electron microscopy, scanning electron microscopy. Findings: During the experimental studies the course of elongation curves has been determined. The stress in material after deformation at elevated temperature was analysed by FEM simulation. It has been confirmed the possibility of existence the inhomogeneous deformation hypothesis as a cause of DMT phenomenon. Practical implications: Understanding of material properties during high temperature deformation leads to selection of the appropriate production parameters and reductions of cost, helps to avoid destruction of material during production or operating. FEM simulations can help to reduce the costs of multiple destructive tests to determine material properties. Originality/value: FEM simulation and investigations of this CuNi25 alloy complete knowledge about mechanical properties of this material and help us develop correct parameters for more effective technologies for material production and exploitation.