Effect of Trace Sc and Ti on Tensile Properties of Commercial Pure Al
The effects of trace Sc and Ti on the microstructure and room-temperature tensile property of commercial pure Al were investigated. It is found that the joint addition of Sc and Ti can refine the grain size of pure Al markedly; and the extent of refinement increases with the increase of Ti content. The improvement of tensile properties of Al-Sc-Ti alloys is mainly associated with the secondary Al3 (Sc,Ti) precipitation,and independent of the grain size. Although the increase of Ti concent can increase the thermal stability and yield strength,it decreases the maximum of tensile strength and strain-hardening strength.