抄録
Titanium is one of the useful materials in industrial fields because of the good properties of light weight, high temperature resistance and so on. In this study, the tungsten fiber reinforced titanium composite (W/Ti) was produced by the spot welding method. This manufacturing method used only a simple spot welding system, and it did not need a vacuum chamber and a high temperature furnace such as existing common methods. The arranged tungsten fibers were held between titanium plates (thickness 0.5mm) and fixed by the spot welding. Therefore, this W/Ti composite produced by the spot welding did not joint in the whole position between the tungsten fiber and the titanium matrix because of the partial welding in spot welding points. The coverage, a rate of welding area to the whole plate area, became in 100% for the sample in this study, because it should make up for the partial welding by this method. X-ray stress measurement is the most useful non-distractive method for estimating residual stresses on material surface. It is inferred the W/Ti sample included thermal stresses generated from the thermal expansion coefficient between the titanium matrix and the tungsten fiber. These thermal stresses of the W/Ti composite were measured by x-ray stress measurement. Furthermore, the alteration of thermal residual stress under the thermal cycling was measured by the in-situ x-ray stress measurement technique. These results were discussed from the viewpoint of the thermal expansion coefficient between fiber and matrix.
