The influence of beryllium (Be) addition on the quasicrystal-forming ability (QFA) in Al-Cu-Fe and Al-Mn systems has been investigated using conventional solidification technique. For a series of as-cast (Al62-xBex)Cu25.5Fe12.5 (x=0,1,3,5,7) alloys, the Be addition modified the icosahedral phase formation mechanism from peritectic reaction to primary solidification and resulted in the increase in the volume fraction of the i-phase from 40% for x=0 to 90% for x=7. Such an enhancement of the QFA with the increase of Be content can be represented by using the reduced quasicrystal transition temperature proposed in the present paper. In Al-Mn alloy system, microstructural changes due to the addition of Be were examined in detail by comparing as-cast Al90Mn2.5Be7.5 alloy with Al97.5Mn2.5 bulk ingot. For this alloy system, the substitution of Al by Be was found to reduce substantially the critical Mn-content and cooling rate necessary for the formation of the i-phase.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry