Recovery and recrystallization in rolled tantalum single crystals

Journal Article · Wed Aug 01 04:00:00 EDT 1979 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02811649· OSTI ID:6062063

Vandermeer, R A ^[1]; Snyder, Jr, W B

---

1. Oak Ridge National Lab., TN

The recovery and recrystallization behavior of rolled tantalum single crystals having initial orientations of (001) (110), (112) (110) and (111) (110) has been studied. Each crystal developed a simple, single component texture upon rolling. The texture became more diffuse and the local lattice curvature more intense as the rolling plane deviated from (001) towards (111). The (001) (11/sup 0/) and (112) (110) crystals formed a uniform dislocation array and polygonization occurred on annealing. No recrystallization of the (001) (110) crystal took place at temperatures up to 1673 K. A few randomly-oriented recrystallized grains were nucleated in the (112) (110) crystal but these may have been artificially nucleated. Only the (111) (110) crystal reoriented during rolling; it also formed a cellular dislocation microstructure. This orientation was the only one to recrystallize easily, primarily because of the large lattice curvature. The recrystallized grains could be related to the deformation texture by a rotation of 23 to 24 deg about a common <111> direction that was parallel to the normal direction of the sheet. The nature of the misorientation spread after rolling may have dictated this relation as a compromise to the one usually found in bcc materials, viz. 25 to 30 deg rotation about a common <110> axis. Also, wide dislocation cell size distributions were noted in the (111) (110) crystal. The cell size distributions were log normal in nature. Subgrain growth was very much more rapid in this crystal. There was a large discrepancy between the observed subgrain growth and that predicted theoretically by the coalescence model.

• OSTI ID: 6062063
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 10:8; ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals &amp; Alloys-- Preparation &amp; Fabrication
360102 -- Metals &amp; Alloys-- Structure &amp; Phase Studies
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ELEMENTS
FABRICATION
LINE DEFECTS
MATERIALS WORKING
METALS
ORIENTATION
PHASE STUDIES
RECOVERY
RECRYSTALLIZATION
REFRACTORY METALS
ROLLING
TANTALUM
TRANSITION ELEMENTS