Examinando por Autor "Salazar, D."

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Development of flexible filler ribbons by melt spinning for joining W to CuCrZr material for heat sink application
(Elsevier, 2022) Izaguirre, Ignacio; Prado, Javier de; Sánchez, Maria; Salazar, D.; Ureña, Alejandro
This paper studies the use of the melt-spinning technique as an alternative filler fabrication route to obtain flexible 80Cu-20Ti ribbons, which presents flexible and adaptability properties to cover the divertor or first wall pipe in future fusion reactors. The results showed that best conditions are achieved using a 0.8 mm diameter of the nozzle and 30 m/s of the linear wheel-speed. This condition allows to change the microstructure of the fabricated ribbons giving rise to a lower Cu4Ti intermetallic phase formation enhancing the adaptability properties. Ribbon dimensions are high enough to cover the perimeter of the pipe. Best conditions were selected to use as filler material in W-CuCrZr brazed joints at 960 ◦C. The results showed the consecution of high metallic continuity interfaces. Besides, the selected brazing conditions did not cause any thermal effect in the W base material but caused a softening effect in the CuCrZr base material as a consequence of the coarsening process of the hardening precipitates.
Exploration and optimization of copper-based alloys incorporating amorphizing elements for heat transfer applications
(Elsevier, 2024-02) Izaguirre, I.; Prado, J. de; Rosero-Romo, J.J.; Sánchez, M.; Salazar, D.; Ureña, A.
Attaining an amorphous crystalline structure imparts unique properties to certain metallic alloys that are impossible to achieve with conventional crystalline alloys. This current study investigates the amorphization potential of small additions of Zr, Ni, or V in Cusingle bondTi alloys produced using the melt-spinning technique. The alloys are characterized using X-ray diffraction (XRD), differential thermal analysis (DTA), differential scanning calorimetry (DSC), and transmission electron microscopy (TEM) techniques. The need for filler materials with flexible and adaptable properties for joining the first wall and divertor components of future fusion reactors can be addressed by producing filler ribbons with amorphous structures. The results indicate that a combination of Zr (12 at. %) and Ni (8 at. %), when used as alloying elements with appropriate processing parameters such as a rectangular nozzle of 0.5 × 8.8 mm2 and a linear wheel speed of 30 m/s, can produce an amorphous structure. Only isolated nanocrystalline phases were detected by TEM analysis. As a result, ribbons fabricated under these conditions were several times longer and wider than those made using the Cusingle bondTi master alloy. More importantly, they exhibit enough flexibility to conform to and cover a simulated pipe of the reactor. Conversely, the addition of V led to the formation of brittle phases. Ribbons fabricated under the optimal conditions were tested as filler materials in W-CuCrZr joints at 960 °C and were microstructurally and mechanically characterized, demonstrating their suitability for the intended application