Massachusetts Institute of Technology, USA

The Laboratory for Experimental and Computational Micromechanics, headed by Prof. Subra Suresh at MIT, has benefited from the capabilities of the Micro Materials indenter over a wide range of research topics.

We have paired microindentation experiments on many engineering metals and alloys with uniaxial compression experiments and finite element simulations to develop and validate a new set of algorithms which allow one to determine mechanical properties such as elastic modulus and yield strength directly from indentation data. This research has resulted in an article in Acta Materialia and a pending U.S. patent.

In addition, we have exploited the scheduling and in situ light microscopy capabilities of the MicroMaterials indenter to generate well-defined grids of indentations in amorphous metals. Subsequent transmission electron microscopy (TEM) of these indentations revealed crystallization due to the increased atomic mobility afforded by large indentation pressures. This work was recently reported in Science.

We have also used the scanning feature of the Micro Materials indenter to trace patterned features of samples and indent them with better than 0.5 micron in-plane accuracy. This unique positioning option enabled a systematic study of how the dimensions of metallic patterned lines on substrates affect the plastic deformation of the lines. Such understanding is needed to design against failure in multilevel processors that use metallic lines to connect various circuit components. This work has been reported at various conferences and in Acta Materialia.

We are currently in the process of utilizing and developing the fatigue indentation capabilities of the Micro Materials indenter to better understand how cyclic loading affects fundamental deformation processes.

For further details please contact Krystyn Van Vilet (Krystyn@mit.edu)

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Roslyn Lloyd, MSc
Phone: 01372 378822
Fax: 01372 375353
roslyn@lotoriel.co.uk

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