Transmission electron microscopy of dislocations in cementite deformed at high pressure and high temperature. Issue 17 (12th June 2016)

• Record Type: Journal Article
• Authors: Mussi, A.; Cordier, P.; Ghosh, S.; Garvik, N.; Nzogang, B. C.; Carrez, Ph.; Garruchet, S.
• Is Part Of: Philosophical magazine. Volume 96:Issue 17(2016)
• Page Start: 1773
• Page End: 1789
• Publication Date: 2016-06-12
• Subjects: Cementite -- dislocations -- plastic deformation -- transmission electron microscopy; Condensed matter -- Periodicals; Physics -- Periodicals; Matière condensée -- Périodiques; Physique -- Périodiques; 530.41
• DOI: 10.1080/14786435.2016.1177670
• Languages: English
• ISSNs: 1478-6435

Abstract

Abstract: Polycrystalline aggregates of cementite (Fe3 C) and (Fe, Ni)3 C have been synthesised at 10 GPa and 1250 °C in the multianvil apparatus. Further, deformation of the carbides by stress relaxation has been carried out at temperature of 1250 °C and for 8 h at the same pressure. Dislocations have been characterised by transmission electron microscopy. They are of the [1 0 0] and [0 0 1] type, [1 0 0] being the most frequent. [1 0 0] dislocations are dissociated and glide in the (0 1 0) plane. [0 0 1] dislocations glide in (1 0 0) and (0 1 0). Given the plastic anisotropy of cementite, the morphology of the lamellae in pearlitic steels appears to have a major role in the strengthening role played by this phase, since activation of easy slip systems is geometrically inhibited in most cases.