Application of tritium radioluminography to the detection of hydrogen diffusion in Ti-Cr alloy
- PDF / 180,622 Bytes
- 4 Pages / 612 x 792 pts (letter) Page_size
- 73 Downloads / 195 Views
Section I: Basic and Applied Research
Application of Tritium Radioluminography to the Detection of Hydrogen Diffusion in Ti-Cr Alloy Hideyuki Saitoh and Hirofumi Homma
(Submitted July 19, 2005) Tritium radioluminography has been applied to determine the hydrogen (H) diffusion coefficients in Ti50Cr50 and Ti40Cr60 alloys, both with two-phase structures of a body-centered cubic (bcc) phase and a Laves phase. Using radioluminography, H distributions in those phases have been observed, and H penetration profiles have been measured. The tritium diffusion coefficients in the Ti50Cr50 and Ti40Cr60 alloys have been successfully determined by analyzing the tritium penetration profiles to be 3.3 ± 0.3 × 10−12 and 1.4 ± 0.1 × 10−12 m2/s, respectively. These values suggest that the H diffusion in the Laves phase is slower than that in the bcc phase. It is also suggested that H diffuses by short-circuiting diffusion through the interface between the bcc phase and the Laves phase.
1. Introduction Tritium radioluminography[1] is a useful technique with which to visualize hydrogen (H) distribution in materials. In this method, an imaging plate (IP) is used as a detector for tritium due to its higher sensitivity and wide dynamic range for radiation rays.[2,3] In a previous work, the authors performed a quantitative observation of H distribution in pure vanadium (V)[1,4], V-based alloys,[5-8] and Ti-Cr alloys[9,10] by tritium radioluminography, and showed the effect of microstructure or constituent elements on the tritium distribution in these materials. In one of those experiments, radioluminography was made on a section of a V-5 mass%Fe alloy normal to the hydrogenated surface and observed the concentration profile of the equilibrium distribution of H. This result suggests that in any alloy in which H diffusion is less than that of the V-5mass%Fe alloy, it should be possible to obtain a gradually decreased H concentration profile and therefore to obtain the H diffusion coefficient. In a Ti-Cr system, the hydrogenation property was investigated for the TiCr2 Laves phase with a C14-type or C15-type structure[11,12] and for a Ti-Cr solid solution alloy with a body-centered cubic (bcc) structure.[13,14] The authors examined a relationship between the H distribution and the microstructure in the alloys by tritium radioluminography.[9] In this experiment, H diffusion seems to be slow in comparison with the V alloys. Thus, in the present
This article is a revised version of the paper printed in the Proceedings of the First International Conference on Diffusion in Solids and Liquids—DSL-2005, Aveiro, Portugal, July 6-8, 2005, Andreas Öchsner, José Grácio and Frédéric Barlat, eds., University of Aveiro, 2005. Hideyuki Saitoh, Department of Materials Science and Engineering, Muroran Institute of Technology, 27-1 Mizumoto, Muroran 050-8585, Japan; and Hirofumi Homma, Hydrogen Isotope Research Center, Toyama University, 3190 Gofuku, Toyama 930-8555, Japan. Contact e-mail: [email protected].
516
work, the intention is to use tri
Data Loading...
