Is the Crystal Structure of Cleaned Tungsten Wire Polycrystalline or Single-Crystal?

The crystal structure of cleaned tungsten wire depends on the preparation process. Common cleaned tungsten wire typically has a polycrystalline structure, composed of multiple tiny grains with a body-centered cubic (BCC) lattice. Polycrystalline tungsten wire is hard and brittle, making it more difficult to process. However, through special techniques (such as zone melting), single-crystal tungsten wire can be produced, which offers better ductility while maintaining a body-centered cubic crystal structure but without grain boundary defects.

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