Speaker
Andrei Galatanu
(National Institute of Materials Physics)
Description
W has the highest melting point of all metals, good high temperature strength, high creep resistance and a high thermal conductivity. These properties make W a first choice for armor materials in fusion energy reactors. Unfortunately W can not be also used for structural applications, due especially to its high temperature brittle- to-ductile transition (DBT). However, when cold rolled at about 400°C, W foils, as opposed to bulk W show exceptional properties in ductility, toughness and DBT. Attempts to transfer these properties from W foils to W-based bulk materials resulted in the so-called “W-laminates” concept, i.e. multi layered composites from alternate W and other metal foils. Different approaches were already successfully used to create such composites, but several shortcomings were observed at high temperature exposure or during neutron irradiation. Here we present microstructural and thermo-physical properties results obtained for W-multi-metal laminates, using Cu, Cr or Au deposited thin interface layers and V or Ti foils. The W-laminates have been produced by FAST (field assisted sintering technique). The obvious advantage of this route resides in the short processing time, with lower recrystallization detrimental effects, while allowing for temperatures close to the metal melting points, thus making the process similar to brazing. The deposited layers can tune the Joule heating at the interfaces during processing time and consequently improving the interface microstructure. More important the multi-metal approach creates a promising route to improve the performance of materials during high temperature exposure.
Co-authors
Andrei Galatanu
(National Institute of Materials Physics, Magurele, Romania)
Cristian Stancu
(National Institute for Laser, Plasma and Radiation Physics, Atomistilor Street 409, Magurele, Ilfov , Romania)
George Ruiu
(National Institute of Materials Physics, Magurele, Romania)
Magdalena Galatanu
(National Institute of Materials Physics, Magurele, Romania;Doctoral School in Physics, University of Bucharest, Atomistilor Street 405, Magurele, Ilfov , Romania)
Monica Enculescu
(National Institute of Materials Physics, Magurele, Romania)
