Abstract
The work concerns the application of the acoustic emission (AE) method in testing the mechanical properties of continuously cast industrial tin bronze CuSn6P, which reveals tendencies to instable plastic flow connected particularly with the Portevin-Le Chatelier (PLC) effect. The relations between the jerky flow connected with the PLC effect, AE intensity and the evolution of a fracture of the investigated alloy subjected to the tensile test at a strain rate (?? ) of about 1.2·10-3s-1 in the range of temperatures (20÷400?C) has been analyzed. It has been found that the highest intensity of the oscillation of stresses, corresponding to the instability of plastic deformation PLC occurred at 200?C, whereas the maximum of the AE activity is at about 200÷250?C. The brittle intergranular fracture starts in the range of equicohersive temperature (TE) of about 200?C. Plastic deformation of the investigated alloy in the range of the temperature of minimum plasticity, amounting to about 400?C, results in intercrystalline fractures on the entire surface of the stretched samples.
Highlights
Plastic deformation of copper alloys, those with a small energy of the stacking fault (SFE), for instance tin bronzes and brasses at elevated temperature and a strain rate ( ) amounting to about ÷ok. 10-2s-1 is a complex process, occurring most often in a heterogeneous way, due to the simultaneous effect of several mechanisms of deformation
The work concerns the application of the acoustic emission (AE) method in testing the mechanical properties of continuously cast industrial tin bronze CuSn6P, which reveals tendencies to instable plastic flow connected with the Portevin-Le Chatelier (PLC) effect
The relations between the jerky flow connected with the PLC effect, AE intensity and the evolution of a fracture of the investigated alloy subjected to the tensile test at a strain rate ( ) of about 1.2·10-3s-1 in the range of temperatures (20÷400 C) has been analyzed
Summary
Plastic deformation of copper alloys, those with a small energy of the stacking fault (SFE), for instance tin bronzes and brasses at elevated temperature (about 0.4 to 0.6 Tt) and a strain rate ( ) amounting to about ÷ok. 10-2s-1 is a complex process, occurring most often in a heterogeneous way, due to the simultaneous effect of several mechanisms of deformation. The aim of the present paper is to apply methods of acoustic emission in mechanical tests of uni-axial stretching of tin bronze of the type CuSn6P from industrial smelting, indicating distinctly a tendency to instability of plastic flow at elevated temperature of deformation due to the effect PLC.
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