|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Frontiers in Solidification Science and Engineering
||Solidification of Aluminum Alloy A7050 Processed by Spray Forming: From Droplets to Dense Deposits
||Claudemiro Bolfarini, Guilherme Zepon, Walter Botta, Lucas Otani, Claudio Kiminami
|On-Site Speaker (Planned)
Microstructure formation of spray formed materials is not well understood considering actual solidification models as there are no traces of dropletīs microstructure, cellular/dendritic with interdendritic segregation, in the final deposit: cored, equiaxial grains with no traces of dendrites. This paper presents a new insight to bring out the prevailing mechanisms during the development of bulk deposits. It considers that the already solidified droplets hitting the substrate will melt partially according to the equilibrium temperature of the deposit, which is located within the solidification interval of the alloy. This way the interdendritic segregation will be eliminated and incorporated into the liquid fraction. The solid phase will be constituted of homogenized, dispersed particles, and the remaining liquid will continue solidifying under non equilibrium conditions following the Scheil Model. This Model can exply very well the final microstructure of A7050 alloy processed by spray forming.
||Planned: Supplemental Proceedings volume