Abstract
The liquid Ni-20at.% Zr hyperperitectic alloy was substantially undercooled by electromagnetic levitation technique up to 225K (0.13TL). A sudden drop for the measured growth velocity is observed around the critical undercooling of 155K. This is confirmed as a transition of growth mode from primary Ni7Zr2 dendritic growth to coupled growth of Ni7Zr2 and Ni5Zr phases. Similar interface attachment kinetics and the planar front growth of Ni7Zr2 and Ni5Zr phases are responsible for the formation of peritectic coupled growth. The eutectic-like lamellar structure also forms in a free fall experiment, which further clearly demonstrates the existence of peritectic coupled growth induced by undercooling.
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