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Covalent crystals are hard, frequently brittle materials such as diamond, silicon, and silicon carbide.
Brittle materials, such as glass, cannot accommodate concentrations of stress because they lack ductility, and therefore fracture easily.
Ultrasonic machining is used primarily for cutting hard, brittle materials that may be conductors of electricity or insulators.
For most brittle materials, stresses beyond the elastic limit result in fracture with almost no plastic deformation.
This behaviour is characteristic of brittle materials: the transition from an integral specimen to a broken one occurs almost instantaneously and with little or no warning.
Brittle materials, such as cast iron, cannot be plastically deformed, though at elevated temperatures some, such as glass, which is not a crystallized solid, do undergo plastic flow.
For this author, cement composites are quasi brittle materials.
However, there is scanty knowledge about comminution of non-brittle materials in contrast to brittle materials.
"The challenge was to make brittle materials into a flexible wire; it seemed impossible," Peterson says.
Single crystal silicon is one of the typical brittle materials.
They may also operate in rock and other brittle materials.
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CEO of Professional Science Editing for Scientists @ prosciediting.com