Synergistic Effect of RE (La, Er, Y, Ce) and Al-5Ti-B on the Microstructure and Mechanical Properties of 6111Aluminum Alloy

For aluminum alloys, grain refinement is one of the effective methods for improving both strength and ductility. However, refining effect Al-Ti-B master alloy refiners deteriorates due to agglomeration sinking second phase particles. In this paper, effects rare earth type, content, holding time on microstructure properties Al-5Ti-B + RE/6111 were investigated by orthogonal experiment. It was shown that addition promoted transformation β-Al5FeSi anα-Al15(Mn,Fe)3Si2 phase, while segregation made it difficult TiB2 aggregate inhibited growth TiAl3, resulting in more particles becoming nucleation substrates. The Ce developed based experiment improved recession problem well comprehensive mechanical 6111 alloy. found 0.1Ce, which had an ultimate tensile 240.4 ± 2.2 MPa, successfully reduced size 73.8% elongation 37.8% compared base There search great significance preparation application high-performance