Discussion
The initial stage of sintering is characterised by
Answer: B
Correct answer: neck formation between adjacent particles
The initial stage is the growth of necks at the points where particles touch, driven by the very high curvature there. Densification in this stage is modest, typically a few per cent, and the particle identities are still distinct. Isolated spherical pores at grain corners belong to the final stage, and a continuous cylindrical pore network to the intermediate one.
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