TOLLEY Alfredo Juan
congresos y reuniones científicas
On the Effect of Zr on Precipitate Evolution in Al-Sc-Zr alloys.
TOLLEY, ALFREDO JUAN; VELIMIR RADMILOVIC,; ULRICH DAHMEN,
Congreso; Jornadas SAM/CONAMET 2004; 2004
Sociedad Chilena de Materiales
The addition of Sc in Al alloys increases the recrystallisation resistance and hardness. These effects are due to the formation of Al3Sc precipitates that inhibit the movement of grain boundaries and dislocations. Addition of Zr together with Sc enhances these effects. Since Zr is soluble in Al3Sc, replacing Sc, it is assumed that the precipitates formed in ternary Al-Sc-Zr are Al3(Sc,Zr). The kinetics of the evolution of Al3Sc precipitates in binary Al-Sc have been studied by several authors. In this work, we study the effect of the addition of Zr to binary Al-Sc on the evolution of precipitates, using TEM characterisation. The results show that the addition of Zr strongly modifies the size evolution of the precipitates during aging, slowing down the coarsening kinetics.