Metallurgical Transactions A

, Volume 20, Issue 10, pp 2109-2115

First online:

The evolution of microstructure in the undercooled Zn-Sn entrained droplets

  • K. ChattopadhyayAffiliated withDepartment of Metallurgy, Indian Institute of Science
  • , P. R. SwarnambaAffiliated withDepartment of Metallurgy, Indian Institute of Science
  • , J. P. N. SrivastavaAffiliated withMishra Dhatu Nigam Parishad

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The existence of a metastable miscibility gap has been indicated from the metastable phase diagram of the Zn-Sn system calculated using regular solution and Krupkowski's models. To validate this phenomenon experimentally, the entrained droplet technique was used to achieve high undercooling and to access the metastable regions. The microstructural analysis confirms the miscibility gap and the associated monotectic reaction. Evidence is also presented for a possible massive solidification of the undercooled melt.