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Electron-beam floating zone melting of refractory metals and alloys: Art and Science

1993; Elsevier BV; Volume: 12; Issue: 5 Linguagem: Inglês

10.1016/0263-4368(93)90037-g

0263-4368

V.G. Glebovsky, В. Н. Семенов,

Ion-surface interactions and analysis

Crucibleless methods are extremely important for melting, studying and preparation of high purity refractory metals because of their high melting point and chemical reactivity in the liquid state. The electron-beam floating zone melting technique (EBFZM) was used both for purification of refractory metals and alloys from gaseous and metallic impurities and growing single crystals with predicted dislocation structure. Growing processes of bicrystals of refractory metals from the melt, with the grain boundary type and other bicrystalline parameters determined in advance, are also studied. Bicrystals grown by EBFZM give the unique opportunity to study different grain boundary phenomena. Application of EBFZM to grow single crystal tubes of tungsten and molybdenum are discussed. Their real dislocation structure is studied. There is a possibility that high purity refractory metals prepared by EBFZM may be used as semiproducts for advanced metallurgical technology.