Malleability is material’s ability to form a thin sheet by hammering – deformation under compression. Ductility is material’s ability to be stretched into a wire – deform under tensile stress. Increasing levels of carbon decrease steel ductility.
Both properties are aspects of plasticity which occurs in metals due to metallic bonds. Outer electrons are delocalised, shared between atoms, what allows that metal atoms can slide past one another.
Mechanical properties of metals depends on dimensions when the piece is smaller than some 1 mm. It is called size effect. The grains located at metal surface behave differently than the internal grains. When the thickness of the piece of metal is reduced to several tenth of μm, than the role of surface grains increases what leads to different properties compared with bulk material.
This is my understanding of burr behaviour in some cases. The topic is complicated and so no guarantee is given for the correctness of this post.
Both properties are aspects of plasticity which occurs in metals due to metallic bonds. Outer electrons are delocalised, shared between atoms, what allows that metal atoms can slide past one another.
Mechanical properties of metals depends on dimensions when the piece is smaller than some 1 mm. It is called size effect. The grains located at metal surface behave differently than the internal grains. When the thickness of the piece of metal is reduced to several tenth of μm, than the role of surface grains increases what leads to different properties compared with bulk material.
This is my understanding of burr behaviour in some cases. The topic is complicated and so no guarantee is given for the correctness of this post.