The perfection of tungsten single crystals grown from the melt and solid state

✍ Scribed by V.G. Glebovsky; V.N. Semenov

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 718 KB
• Volume: 53
• Category: Article
• ISSN: 0042-207X
• DOI: 10.1016/s0042-207x(98)00394-7

✦ Synopsis

High-temperature gradients at the solid-liquid interface during the growth of W single crystals from the melt by electron beam floating-zone melting do not allow one to grow high-purity W single crystals free from small-angle boundaries with misorientation angles less than 3-5 min of arc and subgrain dislocation densities of less than 2;10 cm. W single crystals with a more perfect crystallographic structure can be obtained by strain annealing. In such single crystals there are no subboundaries and the dislocation density is about 8;10 cm.