Effect of complex alloying of Sc, Zr and Ti on the microstructure and mechanical properties of Al-5Mg alloys

摘要: The effect of complex alloying Sc, Zr and Ti on the microstructure, recrystallization resistance mechanical properties Al-5Mg alloys is investigated. refines grain size to 62 μm, which only half that alloy containing Sc. temperature rises from 250 about 450 °C. yield strength increases 135 MPa, close ultimate tensile Al-5Mg. Ultimate values above 390 MPa can be obtained, are 40% larger than Though uniform elongation decreases 30 17%, ductility still excellent. reason eutectic composition Al-Al 3 favorable formation stablization primary secondary particles such as Al (Sc 1-x x ), ). These not increase heterogeneous nucleation α-phase in melt but also effectively pin dislocations, boundaries or sub-boundaries.