1 Introduction
The material surfaces are engineered to
impart specific properties, which could be different
from those of the core material. These surface
modifications are generally carried out to impart wear
and corrosion resistance of the substrate materials.
Various surface engineering process techniques are
adopted for surface modifications which include
chemical deposition process, high temperature
diffusion related process involving chemical
reactions, deposition by fusion routes such as weld
overlay, flame spray techniques etc., which are
widely employed.
Friction surfacing, which is related to
friction welding, utilizes this technology allows
joining dissimilar metallic materials while
avoiding the brittle intermetallic formations,
involving temperatures below melting point and
producing like forged metal structures. The friction
surfacing of aluminium presents an inherent
problem due to the high thermal conductivity of
the metal. However with aluminium heat quickly