Abstract
A new photolithographic technique is developed to visualize the deformation of composite materials at high temperature. A very fine metallic grid is deposited onto the surface of the samples. The grid is deposited by the evaporation of a metal through a mask fabricated by holographic lithography. This process provides a means of obtaining grids with a separation of lines as fine as 0.1 μm. Samples of WCCo composite material were deformed at 900°C and observed by scanning electron microscopy. The displacement of the grid lines shows the decohesion of WC grains and sliding. No deformation inside the grains was observed.
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