Plastic deformation of CVD textured tungsten; 1: Constitutive response

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Acta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-7151(94)90074-4· OSTI ID:143917

Subhash, G; Lee, Y J; Ravichandran, G ^[1]

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1. California Inst. of Tech., Pasadena, CA (United States), Div. of Engineering and Applied Science

The constitutive response of CVD textured tungsten in <001>, <011> and random orientations under uniaxial compression subjected to a range of strain rates is investigated. Both <001> and <011> textured specimens revealed a strong strain rate sensitivity. The <001> specimens showed large ductility at all strain rates and significant strain softening during high strain rate deformation. The <011> texture undergoes homogeneous deformation under quasi-static loading but failed prematurely due to extensive grain boundary cracking during high strain rate loading. The random orientation specimens exhibited brittle failure. The temperature rise during high strain rate deformation was measured using high speed infrared detectors. A physically based crystal plasticity model motivated by dislocation reactions in b.c.c. metals is outlined. The model predicts the dependence of constitutive response on the texture in tungsten polycrystals and suggests that the transverse tensile stresses which develop in <011> orientation due to the crystallographic asymmetry could be responsible for observed grain boundary cracking.

• OSTI ID: 143917
• Journal Information: Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 1 Vol. 42; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL VAPOR DEPOSITION
DEFORMATION
DUCTILITY
MICROSTRUCTURE
TEXTURE
TUNGSTEN