[Table of Contents]

Plasma and Fusion Research

Volume 3, 017 (2008)

Regular Articles

Irradiation Creep Behavior of Vanadium Alloys during Neutron Irradiation in a Liquid Metal Environment
Kenichi FUKUMOTO, Minoru NARUI1), Hideki MATSUI1), Takuya NAGASAKA2) and Takeo MUROGA2)
Graduate School of Nuclear Power and Energy Safety Engineering, University of Fukui, Fukui 910-8507, Japan
The Oarai Center, Institute for Materials Research, Tohoku Univ., Oarai 310-1313, Japan
National Institute for Fusion Science, Toki 509-5292, Japan
(Received 30 November 2007 / Accepted 25 February 2008 / Published 21 April 2008)


The manufacturing process of creep specimens and an irradiation technique in a liquid metal environment for in-pile and creep measurements of irradiated samples are established for highly purified V-4Cr-4Ti, NIFS-HEAT alloys. Irradiation experiments with sodium-enclosed irradiation capsules in JOYO and lithiumenclosed irradiation capsules in HFIR-17J were conducted using pressurized creep tubes. From thermal creep experiments, the activation energy of creep deformation using pressurized creep tubes was determined to be 210 kJ/mol·K, the creep stress factor was 4.9 for an 800°C creep test, and its mechanism was determined to be a climb-assisted glide of dislocation motion. It was found that the creep strain rate exhibited a linear relationship with effective stress up to 150 MPa from 425 to 600°C under JOYO and HFIR irradiation. The activation energy of irradiation creep was estimated to be 46 kJ/mol·K. No significant difference in irradiation creep behavior between the liquid sodium and liquid lithium environments was observed. A set of essential physical data of irradiation creep properties was obtained for V-4Cr-4Ti alloys.


vanadium alloy, irradiation creep, liquid metal environment, irradiation technique, impurity effect

DOI: 10.1585/pfr.3.017


  • [1] T. Muroga, J.M. Chen, V.M. Chernov et al., J. Nucl. Mater. 367-370, 386 (2007).
  • [2] S.J. Zinkle, H. Matsui, D.L. Smith et al., J. Nucl. Mater. 258-263, 205 (1998).
  • [3] K. Fukumoto, H. Matsui, M. Narui, T. Nagasaka and T. Muroga, J. Nucl. Mater. 335, 103 (2004).
  • [4] T. Muroga, T. Nagasaka, A. Iiyoshi et al., J. Nucl. Mater. 283-287, 711 (2000).
  • [5] T. Nagasaka, T. Muroga and T. Iikubo, Fusion Sci. Tech. 44, 465 (2003).
  • [6] K. Fukumoto, T. Nagasaka, T. Muroga et al., J. Nucl. Mater. 367-370, 834 (2007).
  • [7] K. Fukumoto, N. Narui, H. Matsui et al., to be published in J. Nucl. Sci. Tech. (2008).
  • [8] R.J. Kurtz and M.L. Hamilton, J. Nucl. Mater. 283-287, 628 (2000).
  • [9] K. Fukumoto, T. Yamamoto, S. Nakao et al., J. Nucl. Mater. 307-311, 610 (2002).
  • [10] K.R. Wheeler, E.R. Gilbert, F.L. Yaggee and S.A. Duran, Acta Metall. 19, 21 (1971).
  • [11] D. Harrod and R.E. Gold, Int. Met. Rev. 4, 163 (1980).
  • [12] H. Boehm et al., J. Less-Common Met. 12, 280 (1967).
  • [13] H. Boehm et al., Z. Metallkdet. 59, 715 (1968).
  • [14] K. Natesan, W.K. Soppet and A. Purohit, J. Nucl. Mater. 307-311, 585 (2002).
  • [15] R.J. Kurtz, K. Abe, V.M. Chernov et al., J. Nucl. Mater. 329-333, 47 (2004).
  • [16] D.L. Smith and K. Natesan, Nucl. Technol. 32, 392 (1974).
  • [17] L.K. Manser and T.C. Reiley, J. Nucl. Mater. 90, 60 (1980).

This paper may be cited as follows:

Kenichi FUKUMOTO, Minoru NARUI, Hideki MATSUI, Takuya NAGASAKA and Takeo MUROGA, Plasma Fusion Res. 3, 017 (2008).