The main purpose of presented work is to obtain W-Cu&W-Y cylindrical bulk nanostructured billets by explosive consolidation technology in hot condition, near to theoretical densities and improved physical/mechanical properties.
The first stage investigation were carried out for explosive consolidation of powders at room temperatures to obtain billets with increased density without cracks and activated surfaces of consolidated particles. The second stage investigation were carried out for the same billets, but consolidation were conducted in hot conditions, after heating of samples in between 940-11000C, the intensity of loading was equal to 10GPa.
Consolidated different type of W-Cu composition containing 10-40% of nanoscale W, during investigation showed that the combination of high temperatures (above 940°C) and two-stage shock wave compression was beneficial to the consolidation of the incompatible pair W-Cu composites, resulting in high densities, good integrity and good electronic properties.
It was established that in comparison with W-Cu composites with coarse tungsten the application of nanoscale W precursors and depending of content of W gives different result.
Tungsten is a prime material candidate for the first wall of a future fusion reactor. In this study, the microstructure and microhardness of tungsten-yttrium (W-Y) composites were investigated as a function of Y doping content (0.5÷2wt.%). It was found that the crystallite sizes and the powder particle sizes were increased as a result of the increase of Y content. Nearly fully dense materials were obtained for W-Y alloys when the Y content was higher than 0.5wt.%. Investigation revealed that the Y rich phases were complex (W-Y) oxides formed during the sintering process. Also very interesting to use doping chromium with yttrium-containing alloys. e.g. (W-10÷12Cr-0.5÷2Y)wt.%. The extent up to which yttrium acts as an active element improving the adherence and stability of the protective Cr2O3 layer formed during oxidation is assessed.
The processing of the precursors and the fabrication of nanostructured composites together with the detail description of explosive consolidation technique in hot condition and other features of structure-property relationship will be presented and discussed.
Acknowledgements
The authors gratefully acknowledge the financial support of the Shota Rustaveli National Science Foundation (SRNSF Grant Agreement № YS15_2.2.10_101).
