Crystallography of Growth Blocks in Spheroidal Graphite

Etienne Brodu (1) , Emmanuel Bouzy (1) , Jean-Jacques Fundenberger (1) , Benoit Beausir (1) , Lydia Laffont (2) , Jacques Lacaze (2)

1 LEM3 - Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingénierie des matériaux

A better understanding of spheroidal graphite growth is expected in a near future thanks to widespread use of transmission electron microscopy. However, common transmission electron microscopy is quite time consuming and new indexing techniques are being developed, among them is transmission Kikuchi diffraction in a scanning electron microscope, a recent technique derived from electron backscatter diffraction. In the present work, on-axis transmission Kikuchi diffraction in scanning electron microscope, completed by transmission electron microscopy, was used with the objective of producing new observations on the microstructure of spheroidal graphite. This study shows that disorientations between blocks and sectors in spheroidal graphite are quite large in the early growth stage, which may be indicative of a competition process selecting the best orientations for achieving radial growth along the c direction of graphite.

Keywords: Spheroidal graphite; Cast iron; Crystallinity; Transmission electron microscopy; Transmission Kikuchi diffraction (TKD)

Domains: Materials Science [cond-mat.mtrl-sci]; Materials

Etienne Brodu, Emmanuel Bouzy, Jean-Jacques Fundenberger, Benoit Beausir, Lydia Laffont, et al.. Crystallography of Growth Blocks in Spheroidal Graphite. Materials Science Forum, 2018, 925, pp.54-61. ⟨10.4028/www.scientific.net/MSF.925.54⟩. ⟨hal-01971924⟩