From Northwestern University Center for Atom-Probe Tomography
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TEM of a tip

Transmission-electron micrograph of a 3DAP tomograph tip. The coherency contrast comes from nano-scale Al3Sc precipitates in Al (after aging at 300° C for 5 hours). These fine precipitates lead to high strength at ambient and elevated temperatures. Marsha van Dalen and Richard Karnesky are introducing ternary and quarternary alloying additions to further improve mechanical properties and coarsening resistance.

From Emmanuelle Marquis's Ph.D. Thesis.