A few examples of disintegration effects created in Unreal Engine 4. I used shaders, Niagara particles and Blueprints to create them.
Used character: Crunch from Paragon (Epic Games).
UE4 Disintegration - Niagara & Shader
UE4 Disintegration - Niagara & Shader
UE4 Disintegration Shader
No particles - just a shader with pivot points
UE4 Disintegration Shader 02
No particles - just a shader with pivot points
UE4 Disintegration Shader 03
No particles - just a shader with pivot points
UE4 Laser Integration Shader
No particles - just a shader with World Position Offset