Adhesion Upon Solidification and Detachment in the Melt Spinning of Metals
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- 作者：Anthony L. Altieri (1)
Paul H. Steen (1) - 刊名：Metallurgical and Materials Transactions B
- 出版年：2014
- 出版时间：December 2014
- 年：2014
- 卷：45
- 期：6
- 页码：2262-2268
- 全文大小：586 KB
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Paul H. Steen (1)
1. Cornell University, Ithaca, NY, USA - ISSN：1543-1916
文摘
In planar-flow melt spinning, liquid metal is rapidly solidified, against a heat-sink wheel, into thin ribbons which adhere to the substrate wheel. In the absence of a blade to mechanically scrape the ribbon off the wheel, it may wrap fully around and re-enter the solidification region, called ‘catastrophic-adhesion. Otherwise, detachment occurs part way around the wheel, called ‘natural-detachment. Natural detachment occurs through a release of thermo-elastic stress after sufficient cooling of the ribbon, according to prior studies. This note extends prior work by invoking a crack propagation view of natural detachment which, when combined with a simple model of the thermo-elastic stress build-up and ribbon cooling, yields an adhesion/detachment criterion characterized by an interfacial adhesion/fracture energy \(\gamma \) . For aluminum-silicon alloys frozen against a copper substrate, we report \(\gamma \approx\,\) 60 N/m. The criterion can be used to predict detachment once a heat-transfer coefficient is known. We obtain this parameter from natural detachment experiments and then use it to predict catastrophic adhesion in a semi-empirical way. Our note puts a quantitative foundation underneath prior qualitative discussions in the literature. Alternatively, it demonstrates how the interfacial strength of adhesion, a property only of the pair of adhering materials, might be measured based on sticking distance experiments.