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Plastic deformation of CVD textured tungsten — I. Constitutive response

Subhash, G. and Lee, Y. J. and Ravichandran, G. (1994) Plastic deformation of CVD textured tungsten — I. Constitutive response. Acta Metallurgica et Materialia, 42 (1). pp. 319-330. ISSN 0956-7151. http://resolver.caltech.edu/CaltechAUTHORS:20150225-161853778

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Abstract

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 homogenous 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.


Item Type:Article
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http://dx.doi.org/10.1016/0956-7151(94)90074-4 DOIArticle
http://www.sciencedirect.com/science/article/pii/0956715194900744PublisherArticle
Additional Information:© 1993 Pergamon Press Ltd. Received 18 December 1992. The authors wish to acknowledge Professor A. J. Rosakis and Mr J. J. Mason for their help in making the high speed temperature measurements. G. Ravichandran would like to acknowledge the support of the National Science Foundation through a Presidential Young Investigator award.
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NSF Presidential Young Investigator AwardUNSPECIFIED
Record Number:CaltechAUTHORS:20150225-161853778
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150225-161853778
Official Citation:G. Subhash, Y.J. Lee, G. Ravichandran, Plastic deformation of CVD textured tungsten—I. Constitutive response, Acta Metallurgica et Materialia, Volume 42, Issue 1, January 1994, Pages 319-330, ISSN 0956-7151, http://dx.doi.org/10.1016/0956-7151(94)90074-4. (http://www.sciencedirect.com/science/article/pii/0956715194900744)
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ID Code:55224
Collection:CaltechAUTHORS
Deposited By: Cheryl Gause
Deposited On:02 Mar 2015 23:37
Last Modified:29 Sep 2016 23:17

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