Mechanical properties of polycrystalline tungsten

Book · Sat Jun 01 04:00:00 EDT 1996

OSTI ID:237701

Lennon, A M; Ramesh, K T; Hemker, K J ^[1]

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1. Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Mechanical Engineering

The mechanical response of pure polycrystalline tungsten has been investigated over a range of strain rates from 10{sup {minus}3} to 7 {times} 10{sup 3} s{sup {minus}1}. Low strain rate experiments were conducted in an MTS hydraulic load frame and high strain rate experiments were performed in a compression Kolsky bar. Pure polycrystalline tungsten specimens were cut from an extruded tungsten rod and tested in both as-worked and recrystallized conditions. All specimens were prepared so that their loading axes corresponded to the extrusion axis of the original rod. The extruded tungsten exhibited no strain hardening but appreciable strain rate hardening when tested along the extrusion axis. Plasticity of this material was coupled with axial splitting along the grain boundaries. The recrystallized tungsten exhibited strain hardening as well as strain rate hardening at low rates, but the high rate deformation was dominated by extensive intergranular cracking. Orientation of the textured tungsten microstructure with respect to the loading axis was found to have a major influence on the mode of deformation.

• OSTI ID: 237701
• Report Number(s): CONF-9510290--; ISBN 1-878954-58-X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPRESSION STRENGTH
CRACKS
DEFORMATION
EXPERIMENTAL DATA
EXTRUSION
GRAIN BOUNDARIES
GRAIN ORIENTATION
GRAIN SIZE
MECHANICAL PROPERTIES
OPTICAL MICROSCOPY
PLASTICITY
RECRYSTALLIZATION
STRAIN HARDENING
STRAIN RATE
STRAINS
STRESSES
TRANSMISSION ELECTRON MICROSCOPY
TUNGSTEN