A laboratory transmission diffraction Laue setup to evaluate single-crystal quality

A. Arnaud (1) , Wijdène Guediche (1) , Clément Remacha (2) , Edward Roméro (2) , Henry Proudhon (1)

1 CDM - Centre des Matériaux
2 Safran Tech

A scanning laboratory Laue transmission setup is developed to probe extended quasi-monocrystalline samples. Orientation mapping is achieved by controlling the collimation of the incident beam and by scanning the position of the specimen. An automated indexing algorithm for transmission Laue patterns is presented together with a forward simulation model adapted for a laboratory setup. The effect of the main parameters composing the system is studied to aim for exposure time in the order of one second. Applications are presented to probe the orientation of an extended part and detect disoriented regions within the bulk. Finally the analysis of diffraction spot shapes showed that the misorientation within the illuminated volume can be measured and a new method is proposed to evaluate its complete mean lattice rotation tensor.

Domaines: Mécanique des matériaux [physics.class-ph]

A. Arnaud, Wijdène Guediche, Clément Remacha, Edward Roméro, Henry Proudhon. A laboratory transmission diffraction Laue setup to evaluate single-crystal quality. Journal of Applied Crystallography, 2020, 53 (4), pp.914-926. ⟨10.1107/S1600576720006317⟩. ⟨hal-03027163⟩