Abstract
The precipitation of pure Sn particles from the peritectic MnSn2 phase which is stoichiometric intermetallic compound in equilibrium condition has been observed for the first time in directionally solidified Sn-40at%Mn peritectic alloy. The Sn particles are inclined to nucleate at the primary Mn3Sn2/peritectic MnSn2 interface at higher growth velocity. Besides, analysis shows that the solubility range is not constant even for the intermetallic compound which is stoichiometric in equilibrium condition. The actual solubility range of the peritectic MnSn2 phase which is dependent on temperature has been determined through measuring the solute concentrations of the transverse sections with different temperatures. The solidification characteristic of this peritectic alloy also contributes to the precipitation of Sn particles.
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