Direct Alloying of Immiscible Tungsten and Copper Based on Nano Active Structure and Its Thermodynamic Mechanism
Received date: 2022-01-04
Revised date: 2022-03-10
Online published: 2022-05-26
Supported by
National Key Research and Development Program of China(2018YFB0703904);National Key Research and Development Program of China(2017YFE0302600)
W is usually used as plasma-facing components in nuclear fusion reactors because of its high melting point, low sputtering yield, high-temperature strength, and low tritium retention properties. On the other hand, Cu and its alloys show excellent thermal conductivity making them ideal as a heat sink material in reactors. Therefore, W-Cu layered composites have important applications in nuclear fusion reactors. Due to the immiscibility between W and Cu, direct alloying between them without using interlayer metals is critical for the preparation of such layered composites. In this study, a nanoporous active structure was used to induce and promote the direct alloying of the W-Cu system. Direct alloying consists of three steps. First, a nanoporous active layer is prepared on the surface of a W foil via two-step anodizing and deoxidized annealing in a hydrogen atmosphere. Second, a Cu coating layer is deposited on the nanoporous W by electroplating. Finally, the obtained W-Cu electrodeposited sample is annealed at temperatures close to the melting point of Cu (i.e., 980oC). The established thermodynamic model for the direct alloying of immiscible metal systems is used for the direct alloying of W and Cu based on a nanoporous active structure. There are two problems with this model. First, the surface energy results are arbitrary due to the selection of the number of surface atomic layers. Second, the unit scale in thermodynamic calculations. To solve these problems, the calculation methods for surface energy and pressure energy are improved in this work, which makes the thermodynamic calculation for the direct alloying of W-Cu based on a nanoporous active structure feasible. The results show that a nanoporous active structure is formed on the surface of W after nanotreatment. The characterization results of the W/Cu interface show that the diffusion distance between the two metals is about 27 nm and the direct alloying between W and Cu is successful. The average shear strength of the W-Cu layered composites was 101 MPa. This is a 16% increase compared with W-Cu layered composites without a nanoporous structure. The thermodynamic calculation results show that the surface energy of the W-Cu system is greatly improved due to the nanoporous active structure prepared on the W surface. The surface energy can be used as the main thermodynamic driving force for the direct alloying of W-Cu systems. There are different reasons why nanotreatment increases W surface energy. One reason is the increase of crystal planes with high surface energy via nanotreatment of the W surface, and another is the shape of the nanoporous structure.
WANG Hanyu , LI Cai , ZHAO Can , ZENG Tao , WANG Zumin , HUANG Yuan . Direct Alloying of Immiscible Tungsten and Copper Based on Nano Active Structure and Its Thermodynamic Mechanism[J]. Acta Metall Sin, 2023 , 59(5) : 679 -692 . DOI: 10.11900/0412.1961.2022.00003
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