Influence of large-strain deformation on the microstructure, texture, and mechanical response of tantalum bar
- Los Alamos National Lab., NM (United States)
- TexSEM Laboratories, Inc., Provo, UT (United States)
Numerous studies have established the influence of impurities, crystallographic texture, temperature, and strain rate separately or collectively on the constitutive response of annealed tantalum, in particular plate Ta-stock. However, fewer detailed studies have examined the evolution of crystallographic texture and the mechanical response of tantalum bar or rod material following prestraining to large strains {epsilon} > I. In this paper the influence of large plastic prestraining on the microstructure evolution, texture evolution, and mechanical response of high-purity tantalum bar material is presented. Tantalum cylinders annealed at 1200 {degrees}C were quasi-statically upset forged, with intermediate lubrication, to true strains of 0.4, 0.95, and 1.85. Microstructural and textural banding within the starting Ta-bar was characterized in detail. It was found that different oriented bands evolved differently during large-strain forging leading to significant scatter in the mechanical response. Aspects of defect storage, work-hardening response, and texture evolution in Ta-bar as a function of forging strain are discussed.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- Department of Defense, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 212589
- Report Number(s):
- LA-UR--96-587; CONF-960202--10; ON: DE96006967
- Country of Publication:
- United States
- Language:
- English
Similar Records
Influence of tungsten alloying additions on the mechanical properties and texture of tantalum
Mechanical properties and constitutive relations for tantalum and tantalum alloys under high-rate deformation