Abstract
In the presented work the change in the nature of the strain for the Al-Al₄C₃ system was investigated and analysed at temperatures from 20 to 500 °C and strain rates from 2.5 . 10^-5 to 10^-1s^-1. At room temperatures during tensile testing the strain is controlled by dislocation movement and reactions, the first part of the strain is characterized by work hardening expressed by the exponent n, the second part by the local strain in the neck. For high temperatures in the investigated region the principal mechanism keying the nature of the strain is the presence of dynamic recovery processes. Strain rate influences on the fracture are analysed. The ductility values obtained were limited. The values measured at the temperature 450 °C and strain rate 10^-1s^-1 are, we suppose, the onset of the superplastic behaviour.

Key words
Al-Al₄C₃ system, tensile testing, superplastic behaviour, fracture micromechanisms

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