Phase Selection in Undercooled Ni-3.3 Wt Pct B Alloy Melt
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RAPID solidification of undercooled melt acts as an important way for understanding the nonequilibrium transformation mechanism, since it provides a degree of microstructural and morphological flexibility heretofore unattainable by conventional synthesis.[1] One particularity of undercooled solidification is the release of latent heat, thus leading to the recalescence process (which is experimentally observed as an abrupt rising of liquid temperature).[2] As for different solidification behaviors, e.g., single phase, eutectic phase, etc., the recalescence behaviors are totally different; the phase formation is closely dependent on the paths where the recalescences form.[1–3] As a classical eutectic alloy, Ni-Ni3B acts as an important basis for studying the solidification of multicomponent soft magnetic materials, e.g., Fe-Ni-B[4,5] and Fe-Ni-P-B alloy.[6,7] About 50 years ago, Shapiro and Ford studied the orientation and the interfacial relations for Ni-Ni3B eutectic in near-equilibrium solidification of hypoeutectic and hypereutectic Ni-Ni3B alloys (B
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