Face Disintegration effect: The Terror Title Sequence by Elastic

Tripcode Form or Trapcode Form + Trapcode Particular can get you close. 

Card Dance can also do some disintegration workflows.  Card Dance + Scatterize on an Adjustment layer and an Animated Gradient as a track matte for the Adjustment layer can also get something close. There is even Shatter. It will probably take more than one copy of the layer and one effect.

All require your face or head to be on a separate layer with a transparent background. 

I suppose it depends on what I use as a displacement map layer? 

Yes, it does, and without seeing what you actually have achieved so far vs. the desired outcome it will be hard to advise. Show us soem screenshots. That said, the effects look liek 3D vector displacments done inh Nuke or Flame with a few particle effects sprinkled in, so it wil lbe even harder to re-create, given that AE does not have anything comparable.

Mylenium