Au–Fe alloy solidification and solid-state transformations

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• 作者：D. Favez ; J.-D. Wagniè ; re ; M. Rappaz
• 关键词：Au– ; Fe ; Differential thermal analysis (DTA) ; Peritectic solidification ; Discontinuous precipitation ; Coherency relationship
• 刊名：Acta Materialia
• 出版年：2010
• 出版时间：February 2010
• 年：2010
• 卷：58
• 期：3
• 页码：1016-1025
• 全文大小：1189 K

文摘

In order to better understand the microstructure that forms during laser welding of an 18 carat gold and an austenitic stainless steel, solidification of the Au–Fe binary analog has been studied using thermal analysis and interrupted Bridgman experiments. For a hypoperitectic composition, the formation of the primary phase, its coarsening and the peculiar macrosegregation associated with the large density difference between the elements have been studied. Just after the peritectic phase forms around the primary dendrites, continuous and discontinuous precipitation has been shown to occur as a result of the immiscibility of the two face-centered cubic phases below the peritectic temperature. Finally, the solid-state transformations associated with the eutectoid have been characterized.