Dear Kyusik,

Cell iterators have the function set_material_id 
<https://www.dealii.org/developer/doxygen/deal.II/classCellAccessor.html#abe9098e74cd5e1bec7c01abbbf056e13>,
 
so you can change the material ID of any cell at any time. If by 

change the boundary of 2 materials


you mean physically move the triangulation to change the spatial position 
of the interface between two different materials, then this is also 
possible. Look at step-18 
<https://www.dealii.org/developer/doxygen/deal.II/step_18.html#TopLevelmove_mesh>
 
for further information.

I hope that this helps.

Regards,
Jean-Paul

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