Quatification of primary phase undercooling of rapidly solidified droplets with 3D microtomography

Arash Ilbagi (1) , P. Delshad Khatibi (1) , Hani Henein (1) , Charles-André Gandin (2) , Dieter M. Herlach (3)

1 Chemical and Materials Engineering Department
2 CEMEF - Centre de Mise en Forme des Matériaux
3 DLR Institut für Materialphysik im Weltraum

Powders of different compositions of Al-Cu alloys were atomized in helium and nitrogen and the microstructure of the atomized droplets was examined using X-ray micro-tomography. A method was developed to remove X-ray artifacts and background noise from the particles images. The method developed involves creating a clean mask file using MATLAB image toolbox, followed by applying the mask file to the original image to achieve clean images for the particle of interest. Separate features of interest in the droplets, such as region of initial growth and primary dendrites, were investigated at the various stages of solidification. The data is used to estimate the primary phase undercooling of the droplets, which will be used in a solidification model as an input to estimate the phase fractions. The results will then be compared with the experimental results

Domaines: Sciences de l'ingénieur [physics]; Matériaux

Arash Ilbagi, P. Delshad Khatibi, Hani Henein, Charles-André Gandin, Dieter M. Herlach. Quatification of primary phase undercooling of rapidly solidified droplets with 3D microtomography. 1st International Conference on 3D Materials Science 2012, 3DMS 2012, Jul 2012, Seven Springs, Pennsylvania, United States. pp.67-72 - ISBN 978-1-6274-8933-1, ⟨10.1002/9781118686768.ch10⟩. ⟨hal-00933193⟩