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The effects of the chemical composition on the microstructure and mechanical properties were investigated using automated ball-indentation tests, scanning electron microscopy and energy dispersive X-ray analysis. It was observed that the mechanical properties change with the presence of the eutectic and varying excess content of elements. In this work, the automated-ball-indentation (ABI) technique was compared with the standard mechanical tests. The ABI method is based on controlled multiple indentations into a polished surface by a spherical indenter under load. The indentation depth is progressively increased to the maximum, user-specified limit, with intermediate partial unloading. This technique allows to measure the yield strength, stress-strain curve, strength coefficient and strain-hardening exponent. For all these test materials and conditions, the ABI-derived results were in very good agreement with those obtained with the conventional, standard test methods.

materiali in tehnologije

Use of the ABI technique to measure the mechanical properties of aluminium alloys: effect of chemical composition on the mechanical properties of the alloys