Abstract
The article discussed the effects of hypergravity fields on the dendrite structure, macrosegregation, and mechanical properties of Al7050 alloy. Compared to normal gravity, the average size of α-Al grains at the bottom of the sample was significantly reduced under hypergravity. The melt superheating temperature influenced atomic clusters, which, along with dendrite fragmentation, facilitated heterogeneous nucleation. Subsequently, the "crystal rain" mechanism led to the migration and accumulation of primary crystals. The emergence of coarse columnar dendrites under hypergravity may result from high-speed forced convection transferring solutes at the dendrite tips, thereby promoting dendrite growth through increased concentration gradients. Under hypergravity, Zn, Mg, and Cu elements were enriched at the bottom of the sample, possibly due to solutes expelled during α-Al dendrite growth entering the liquid phase. The denser solute-rich liquid settled at the bottom under hypergravity, precipitating numerous secondary phases. The compressive strength and strain of the hypergravity specimen increased due to its special density-dependent layered structure.
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