Abstract
The determination of the mechanical properties of a brazed joint is an important factor to reach the metallurgical level of a joint development. This paper evaluates the mechanical properties, and its correlation with the joint microstructure, of a W-CuCrZr joint brazed in a high vacuum furnace using 80Cu-20Ti flexible filler material in tape form. This joint is meant to be implemented in the divertor application in future fusion power plants. Main experimental parameters were a brazing temperature of 960 °C and a dwell time of 10 min. The microstructure of the joint was constituted by Cu solid solution and Cu4Ti phases. This last phase was distributed in the W-braze interface. Mechanical properties were evaluated by means of Vickers microhardness and mechanical tests by applying pure shear loads. The microhardness profile of the brazed joint indicated that W remained with the as-received hardness but CuCrZr base material was softened after the brazing procedure. Shear strength of 96 ± 15 MPa was obtained for the brazed joint and fracture propagated at the W-braze interface.
Highlights
W-CuCrZr Joints Brazed with Cu-TiThe continuous development of new materials in the industry makes new joining processes necessary
This paper evaluates the second level of the joint development between tungsten and a copper alloy by measuring the mechanical properties of a brazed joint and its correlation with the joint microstructure using Cu-20Ti filler
The base materials used for the brazing tests were polycrystalline tungsten supplied by Plansee (Reutte, Austria) and CuCrZr alloy supplied by KME (Osnabrück, Germany) with chromium ranges between 0.2 and 1.2 wt.% and zirconium ranges between 0.05 and
Summary
W-CuCrZr Joints Brazed with Cu-TiThe continuous development of new materials in the industry makes new joining processes necessary. For a proper determination of the joint properties, a quality assurance process, which ensures that the joint covers all the requirements of the joint service conditions, is necessary This process is usually developed by levels of joinability, where the first one is the consecution of a full metallic continuity along the joint interface. The second level evaluates the joint from the mechanical point-of-view and ensures that the strength of the joint is within the design criteria of the brazed piece/component To reach this level, the examination of the microstructure must be analyzed to correlate it with the mechanical properties, where the presence of brittle intermetallic compounds, diffusion layers, or base material affectation could have a strong influence on the mechanical properties [1,2]
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