INFLUENCE OF EXTERNAL FACTORS ON THE DEFORMATION OF AL-AL4C3 SYSTEM

In the paper there are discussed the results of the analysis of temper ature and deformation rate influences on static mechanical properties for Al-8Al4C3 system. The pronounced change of plastic properties was shown in the temperature range of 350-450-degrees-C at the deformation rate 10(-1) s-1 as a consequence of dynamic polygonizaton together wi th the grain boundary sliding. The parameters of state equation and ap parent activation energy of the deformation process (325 kJ m-1) were evaluated. From the analysis of fracture micromechanisms follows that low-temperature fractures have transcrystalline character, at the temp eratures above 400-degrees-C the intercrystalline character of the fai lure is dominant.