to require nucleation. The more nuclei available to trigger off the development
of cavities or voids the less the material extends before fracture occurs and so
the less ductile the material. Thus increasing the purity of
a
material increases
its ductility.
6.3 Brittle fracture
When brittle fracture occurs the fracture surface appear bright and granular
due to the reflection of light from individual crystal surfaces. This is because
grains within the material have cleaved along planes of atoms. We can consider
the sequence of events leading to a brittle fracture to be as follows: the bonds
between the atom ...
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