Influence of large-strain deformation on the microstructure, texture, and mechanical response of tantalum bar

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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, ... continued below

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11 p.

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Gray, G.T. III; Bingert, S.R.; Chen, S.R.; Bingert, J.F. & Wright, S.I. March 1, 1996.

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Description

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.

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11 p.

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OSTI as DE96006967

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  • Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Anaheim, CA (United States), 4-8 Feb 1996

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  • Other: DE96006967
  • Report No.: LA-UR--96-587
  • Report No.: CONF-960202--10
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 212589
  • Archival Resource Key: ark:/67531/metadc664139

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  • March 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • April 21, 2016, 9:51 p.m.

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Gray, G.T. III; Bingert, S.R.; Chen, S.R.; Bingert, J.F. & Wright, S.I. Influence of large-strain deformation on the microstructure, texture, and mechanical response of tantalum bar, article, March 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc664139/: accessed November 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.