Abstract
Designing high-performance Al-based alloys on the basis of the entropy concept offers a promising strategy for next-generation advanced structural materials. In this work, a high-Zn-content lightweight medium-entropy AlZnMgCuLi alloy (0.35 cm3/g) is fabricated by droplet ejection. The effects of hot rolling, short-time solid solution treatment and peak ageing on microstructure and mechanical properties of the alloy are systematically studied. The results show that after hot rolling at 380 °C, the specific density is 0.31 cm3/g and elongated grains with the average size of 20 µm are observed. Most of the secondary phases are dissolved into the α(Al) matrix after short-time solid solution (450 °C, 20 min). An excellent ultimate tensile strength of 618 MPa is achieved after ageing treatment, which is considerably higher than that of the as-deposited alloy (234 MPa). Elongated grains, solid solubility, dislocations and a large number of ageing precipitates are beneficial to the high strength of the alloy. Such precipitates together with narrow precipitate free zones cause a brittle intergranular fracture.
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