[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
1)
The Oarai Center, Institute for Materials Research, Tohoku Univ., Oarai 310-1313, Japan
2)
National Institute for Fusion Science, Toki 509-5292, Japan
(Received 30 November 2007 / Accepted 25 February 2008 / Published 21 April 2008)

Abstract

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.

Keywords

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

DOI: 10.1585/pfr.3.017

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This paper may be cited as follows:

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