Characteristics of Microstructure Evolution during FAST Joining of the Tungsten Foil Laminate
Xiaoyue Tan,
Wujie Wang,
Xiang Chen,
Yiran Mao,
Andrey Litnovsky,
Felix Klein,
Pawel Bittner,
Jan Willem Coenen,
Christian Linsmeier,
Jiaqin Liu,
Laima Luo,
Yucheng Wu
Affiliations
Xiaoyue Tan
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
Wujie Wang
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
Xiang Chen
Institute of Industry & Equipment Technology, Hefei University of Technology, Hefei 230009, China
Yiran Mao
Forschungszenturn Jülich GmbH, Institut für Energie- und Klimaforschung—Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany
Andrey Litnovsky
Forschungszenturn Jülich GmbH, Institut für Energie- und Klimaforschung—Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany
Felix Klein
Forschungszenturn Jülich GmbH, Institut für Energie- und Klimaforschung—Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany
Pawel Bittner
Forschungszenturn Jülich GmbH, Institut für Energie- und Klimaforschung—Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany
Jan Willem Coenen
Forschungszenturn Jülich GmbH, Institut für Energie- und Klimaforschung—Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany
Christian Linsmeier
Forschungszenturn Jülich GmbH, Institut für Energie- und Klimaforschung—Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany
Jiaqin Liu
Institute of Industry & Equipment Technology, Hefei University of Technology, Hefei 230009, China
Laima Luo
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
Yucheng Wu
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
The tungsten (W) foil laminate is an advanced material concept developed as a solution for the low temperature brittleness of W. However, the deformed W foils inevitably undergo microstructure deterioration (crystallization) during the joining process at a high temperature. In this work, joining of the W foil laminate was carried out in a field-assisted sintering technology (FAST) apparatus. The joining temperature was optimized by varying the temperature from 600 to 1400 °C. The critical current for mitigating the microstructure deterioration of the deformed W foil was evaluated by changing the sample size. It is found that the optimal joining temperature is 1200 °C and the critical current density is below 418 A/cm2. According to an optimized FAST joining process, the W foil laminate with a low microstructure deterioration and good interfacial bonding can be obtained. After analyzing these current profiles, it was evident that the high current density (sharp peak current) is the reason for the significant microstructure deterioration. An effective approach of using an artificial operation mode was proposed to avoid the sharp peak current. This study provides the fundamental knowledge of FAST principal parameters for producing advanced materials.
