152nd National Meeting

Livingston, Herbert

doi:10.1021/cen-v044n047.p070

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Introduction1

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2009

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“…In 1959, Chalmers [15] predicted that a coupled growth similar to that observed in eutectic alloys should be possible for compositions in the two-solid phase region of peritectic systems. A few years later, Livingston [16] and Flemings [17] supported this prediction and argued that a high thermal gradient is also necessary to suppress morphological instability of both phases and allow coupled growth. In 1974, Boettinger [3] performed directional solidification experiments on Sn-Cd alloys, but did not find eutectic-like coupled growth.…”

Section: Introductionmentioning

confidence: 99%

Peritectic solidification of Cu–Sn alloys: Microstructural competition at low speed

et al. 2009

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Directional solidification experiments on Cu-Sn peritectic alloys have been conducted at very low velocity in a high-thermal-gradient Bridgman furnace. The size of the samples has been reduced in order to decrease natural convection and the associated macrosegregation. At the lowest growth rates (0.5 and 0.58 lm s À1 ), eutectic-like a + b lamellar structures have been observed in near-peritectic composition alloys over several millimeters of growth. These structures resulted from a destabilization of a band structure in which a-and b-phases overlay each other. Electron backscattered diffraction measurements revealed that bands and lamellae of a solid phase are continuous and originate from a single nucleus.

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Section: Introductionmentioning

confidence: 99%