TY - JOUR
T1 - Phase transformations in nickel sulphide
T2 - Microstructures and mechanisms
AU - Yousfi, Oussama
AU - Donnadieu, Patricia
AU - Bréchet, Yves
AU - Robaut, Florence
AU - Charlot, Frédéric
AU - Kasper, Andreas
AU - Serruys, Francis
PY - 2010/5
Y1 - 2010/5
N2 - Nickel sulphide inclusions are known to be responsible for delayed fracture in tempered glasses due to phase transformation within the inclusion. Microstructural identification of the phase transformation mechanisms in the Ni-S system close to the NiS composition were carried out on a series of partially transformed states. Observations allow to investigate the morphological evolution during transformation, the phase orientation relationships and the first stages of the transformation were investigated by optical microscopy, electron backscatter diffraction, and scanning and transmission electron microscopy. The transformation mechanisms change significantly with the change in sulphur content of the α-NiS phase. Massive transformation is observed for near-stoichiometric composition. For overstoichiometric composition, the transformation is controlled by a long-range diffusion mechanism. The influence of stoichiometry and impurities (Fe) on the microstructural evolution and transformation mechanisms has also been studied.
AB - Nickel sulphide inclusions are known to be responsible for delayed fracture in tempered glasses due to phase transformation within the inclusion. Microstructural identification of the phase transformation mechanisms in the Ni-S system close to the NiS composition were carried out on a series of partially transformed states. Observations allow to investigate the morphological evolution during transformation, the phase orientation relationships and the first stages of the transformation were investigated by optical microscopy, electron backscatter diffraction, and scanning and transmission electron microscopy. The transformation mechanisms change significantly with the change in sulphur content of the α-NiS phase. Massive transformation is observed for near-stoichiometric composition. For overstoichiometric composition, the transformation is controlled by a long-range diffusion mechanism. The influence of stoichiometry and impurities (Fe) on the microstructural evolution and transformation mechanisms has also been studied.
KW - Diffusive transformation
KW - Massive transformation
KW - Microstructure
KW - Nickel sulphides
KW - Phase transformation
UR - http://www.scopus.com/inward/record.url?scp=77950089894&partnerID=8YFLogxK
U2 - 10.1016/j.actamat.2010.02.011
DO - 10.1016/j.actamat.2010.02.011
M3 - Article
AN - SCOPUS:77950089894
SN - 1359-6454
VL - 58
SP - 3367
EP - 3380
JO - Acta Materialia
JF - Acta Materialia
IS - 9
ER -