Hostname: page-component-cd9895bd7-gxg78 Total loading time: 0 Render date: 2024-12-27T23:25:33.107Z Has data issue: false hasContentIssue false
  • English
  • Français

Synthesis of high-strength W–Ta ultrafine-grain composites

Published online by Cambridge University Press:  31 January 2011

R.T. Ott ,
X.Y. Yang ,
D.E. Guyer ,
S. Chauhan  and
D.J. Sordelet
R.T. Ott*
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory (United States Department of Energy), Ames, Iowa 50011
X.Y. Yang
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory (United States Department of Energy), Ames, Iowa 50011
D.E. Guyer
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory (United States Department of Energy), Ames, Iowa 50011
S. Chauhan
Affiliation:
Department of Aerospace Engineering, Iowa State University, Ames, Iowa 50011
D.J. Sordelet
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory (United States Department of Energy), Ames, Iowa 50011
*
a)Address all correspondence to this author. e-mail: rtott@ameslab.gov
Get access

Abstract

Bulk samples of an ultrafine-grained tungsten–tantalum composite alloy have been synthesized by consolidating mechanically milled composite powders. The grain growth during densification is limited due to the submicron-scale layering of the individual metals in the composite particles and the relatively low sintering temperature (1300 °C). The ultrafine microstructure of the high-density (∼99% theoretical density) samples leads to a high yield stress of ∼3 GPa under quasi-static uniaxial compression. A tendency for Ta-rich solid-solution formation during densification was observed, and the high-temperature phase equilibria in the composite powders were examined further using high-energy x-ray diffraction at temperatures up to 1300 °C.

Keywords

NanostructurePowder metallurgyW
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 1 , January 2008 , pp. 133 - 139
Copyright
Copyright © Materials Research Society 2008

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Meyers, M.A., Mishra, A.Benson, D.J.: Mechanical properties of nanocrystalline materials. Prog. Mater. Sci. 51, 427 2006CrossRefGoogle Scholar
2Youngdahl, C.J., Sanders, P.G., Eastman, J.A.Weertman, J.R.: Compressive yield strengths of nanocrystalline Cu and Pd. Scripta Mater. 37, 809 1997CrossRefGoogle Scholar
3Carsley, J.E., Fisher, A., Milligan, W.W.Aifantis, E.C.: Mechanical behavior of a bulk nanostructured iron alloy. Metall. Mater. Trans. A 29, 2261 1998CrossRefGoogle Scholar
4Jia, D., Ramesh, K.T.Ma, E.: Effects of nanocrystalline and ultrafine grain sizes on constitutive behavior and shear bands in iron. Acta Mater. 51, 3495 2003CrossRefGoogle Scholar
5Wei, Q., Jiao, T., Mathaudhu, S.N., Ma, E., Hartwig, K.T.Ramesh, K.T.: Microstructure and mechanical properties of tantalum after equal channel angular extrusion (ECAE). Mater. Sci. Eng., A 358, 266 2003CrossRefGoogle Scholar
6Duan, C.Z., Wang, M.J., Pang, J.Z.Li, G.H.: A calculation model of shear strain and strain rate within shear band in a serrated chip formed during high-speed machining. J. Mater. Proc. Technol. 178, 274 2006CrossRefGoogle Scholar
7He, N., Lee, T.C., Lau, W.S.Chan, S.K.: Assessment of deformation of a shear localized chip in high speed machining. J. Mater. Proc. Technol. 129, 101 2002CrossRefGoogle Scholar
8Kad, B.K., Gebert, J-M., Perez-Prado, M.T., Kassner, M.E.Meyers, M.A.: Ultrafine-grain-sized zirconium by dynamic deformation. Acta Mater. 54, 4111 2006CrossRefGoogle Scholar
9Fan, G.J., Wang, G.Y., Choo, H., Liaw, P.K., Park, Y.S., Han, B.Q.Lavernia, E.J.: Deformation behavior of an ultrafine-grained Al-Mg alloy at different strain rates. Scripta Mater. 52, 929 2005CrossRefGoogle Scholar
10Valiev, R.: Nanostructuring of metals by severe plastic deformation for advanced properties. Nat. Mater. 3, 511 2004CrossRefGoogle ScholarPubMed
11Koch, C.C.: Synthesis of nanostructured materials by mechanical milling: Problems and opportunities. Nanostruct. Mater. 9, 13 1997CrossRefGoogle Scholar
12Margulies, L., Kramer, M.J., McCallum, R.W., Kycia, S., Haeffner, D.R., Lang, J.C.Goldman, A.I.: New high temperature furnace for structure refinement by powder diffraction in controlled atmospheres using synchrotron radiation. Rev. Sci. Instrum. 70, 3554 1999CrossRefGoogle Scholar
13Wittenauer, J.Nieh, T.G.: Fine-grained W–Cu–Co alloys in Tungsten and Tungsten Alloys Recent Advances edited by A. Crowson and E.S. Chen TMS Warrendale, PA 1991Google Scholar
14Ryu, H.J., Hong, S.H.Baek, W.H.: Microstructure and mechanical properties of mechanically alloyed and solid-state sintered tungsten heavy alloys. Mater. Sci. Eng., A 291, 91 2000CrossRefGoogle Scholar
15Lee, M.H.Sordelet, D.J.: Shear localization of nanoscale W in metallic glass composites. J. Mater. Res. 21, 492 2006CrossRefGoogle Scholar
16German, R.M.Olevsky, E.: Strength predictions for bulk structures fabricated from nanoscale tungsten powders. Int. J. Refract. Met. Hard Mater. 23, 77 2005CrossRefGoogle Scholar
17German, R.M.Olevsky, E.: Mapping the compaction and sintering response of tungsten-based materials into the nanoscale size range. Int. J. Refract. Met. Hard Mater. 23, 294 2005CrossRefGoogle Scholar
18Xu, Q., Hayes, R.W.Lavernia, E.J.: Creep properties of ball-milled and HIPed pure tantalum. Scripta Mater. 45, 447 2001CrossRefGoogle Scholar
19Romig, A.D.Cieslak, M.J.: Interdiffusion in the Ta–W system. J. Appl. Phys. 58, 3425 1985CrossRefGoogle Scholar
20Vieregge, K.Gupta, D.: Diffusion processes in tungsten metal alloys, thin films and foils in Tungsten and Tungsten Alloys Recent Advances edited by A. Crowson and E.S. Chen TMS Warrendale, PA 1991Google Scholar
21Warren, B.E.: X-ray Diffraction Dover Publications, Inc New York 1990Google Scholar
22Cullity, B.D.Elements of X-ray Diffraction, 2nd ed.Addison-Wesley Publishing Company, Inc. Reading, PA 1978Google Scholar
23de Keijser, Th.H., Langford, J.I., Mittemeijer, E.J.Vogels, A.B.P.: Use of the Voigt function in a single-line method for the analysis of x-ray-diffraction line broadening. J. Appl. Crystallogr. 15, 308 1982CrossRefGoogle Scholar
24Klug, H.P.Alexander, L.E.: X-ray Diffraction Procedures John Wiley & Sons New York 1974Google Scholar
25Wei, Q., Jiao, T., Ramesh, K.T., Ma, E., Kecskes, L.J., Magness, L., Dowding, R., Kazykhanov, V.U.Valiev, R.Z.: Mechanical behavior and dynamic failure of high-strength ultrafine grained tungsten under uniaxial compression. Acta Mater. 54, 77 2006Google Scholar
26Vashi, U.K., Armstrong, R.W.Zima, G.E.: Hardness and grain size of consolidated fine tunsten powder. Metall. Trans. 1, 1769 1970CrossRefGoogle Scholar
27Wei, Q., Zhang, H.T., Schuster, B.E., Ramesh, K.T., Valiev, R.Z., Kecskes, L.J., Dowding, R.J., Magness, L.Cho, K.: Microstructure and mechanical properties of super-strong nanocrystalline tungsten processed by high-pressure torsion. Acta Mater. 54, 4079 2006CrossRefGoogle Scholar
28Hartwig, K.T., Mathaudhu, S.N., Maier, H.J.Karaman, I.: Ultrafine grained materials II in Ultrafine Grained Materials II edited by Y.T. Zhu, T.G. Langdon, R.S. Mishra, S.L. Semiatin, M.J. Saran, and T.C. Lowe TMS Warrendale, PA 2002Google Scholar
29Wei, Q., Ramesh, K.T., Ma, E., Kesckes, L.J., Dowding, R.J., Kazykhanov, V.U.Valiev, R.Z.: Plastic flow localization in bulk-tungsten with ultrafine microstructure. App. Phys. Lett. 86, 101907 2005CrossRefGoogle Scholar
30Bai, Y.Dodd, B.: Adiabatic Shear Localization Pergamon Press New York 1992Google Scholar
31Lennon, A.M.Ramesh, K.T.: The thermoviscoplastic response of polycrystalline tungsten in compression. Mater. Sci. Eng., A 276, 9 2000CrossRefGoogle Scholar
32Wei, Q., Jiao, T., Ramesh, K.T.Ma, E.: Nano-structured vanadium: processing and mechanical properties under quasi-static and dynamic compression. Scripta Mater. 50, 359 2004CrossRefGoogle Scholar