Quantitative coalescence measurements for foaming metals by in situ radiography

In situ X-ray radiography and spatio-temporal image analysis yield quantitative information about coalescence during metal foam formation and decay. The choice of weighting every detected coalescence event by its projected area yields reliable information about the impact of coalescence on structural coarsening. The comparison of two particle-stabilized metal foams containing ceramic particles of different sizes demonstrates that the stabilization effect is provided by solid particles which are small in comparison to the average film thickness of the foamed liquid melt.