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Interdiffusion in superalloys

Light element mapping at high spatial resolution

Thanks to its high brightness Field Emission source, the CAMECA SXFiveFE electron column offers experimental conditions that combine low accelerating voltages with intense beam currents. Under such optimized conditions, the interaction volume between the electrons and the specimen is reduced, and high spatial resolution can be achieved.

Ni-based superalloy, BSE Image  Interdiffusion of elements in a nickel-based superalloy

Interdiffusion study during the heat release between a nickel-based braze and a substrate of nickel-based superalloy.

By using very low accelerating voltage (5keV in this example), the interaction volume between the electrons and the specimen is reduced and high spatial resolution can be achieved.

The X-ray maps acquired on Ni, Mo and B (below) illustrate the SXFiveFE's unique ability to combine low beam voltage for spatial resolution optimization with high sensitivity crystals for X-ray detection optimization

Ni and Mo X-ray maps  

B x-ray mapUnder such optimized conditions, the B Ka map on the left shows very clear details in the range of 300nm lateral resolution. Achieving such resolution on light elements is a real challenge.

Sample courtesy of C. Pascal, R.M. Marin-Ayral, J.C. Tédenac, C. Merlet. Material Science and Engineering A. Vol. 341, Issues 1-2, p. 144-151




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