skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Titanium alloy as a potential low radioactivation vacuum material

Abstract

For the vacuum systems of high-intensity beam accelerators, low radioactivation materials with good vacuum characteristics and high mechanical strength are required. The titanium alloy Ti-6Al-4V was investigated as a potential low activation vacuum material with high mechanical strength for the fabrication of vacuum components, particularly the flanges of beam pipes, in the J-PARC 3 GeV synchrotron. The dose rate of Ti-6Al-4V when irradiated by a 400 MeV proton was observed to decrease more rapidly than that of stainless steel. Furthermore, the generated radioactive isotopes were nuclides with relatively short half-lives. The outgassing rate per unit area of Ti-6Al-4V was approximately 10{sup −8 }Pa m{sup 3}/s m{sup 2} after pumping for 100 h, which is the same as the typical value for stainless steel. Additionally, the hydrogen concentration in bulk Ti-6Al-4V was reduced to approximately 1 ppm by vacuum firing at 700 °C for 9 h; the mechanical strength was not reduced by this process. These results indicate that Ti-6Al-4V is a good candidate for use as a low activation vacuum material with high mechanical strength.

Authors:
; ; ;  [1]; ; ; ; ;  [2]
  1. Japan Atomic Energy Agency, J-PARC Center, 2-4 Shirane Shirakata, Tokai, Naka, Ibaraki 319-1195 (Japan)
  2. Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047 (Japan)
Publication Date:
OSTI Identifier:
22392188
Resource Type:
Journal Article
Journal Name:
Journal of Vacuum Science and Technology. A, Vacuum, Surfaces and Films
Additional Journal Information:
Journal Volume: 33; Journal Issue: 3; Other Information: (c) 2015 American Vacuum Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0734-2101
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; APPROXIMATIONS; BEAMS; DOSE RATES; GEV RANGE 01-10; HYDROGEN; J-PARC; MEV RANGE 100-1000; PROTONS; RADIOACTIVATION; RADIOISOTOPES; STAINLESS STEELS; TITANIUM ALLOYS

Citation Formats

Kamiya, Junichiro, E-mail: kamiya.junichiro@jaea.go.jp, Hikichi, Yusuke, Kinsho, Michikazu, Ogiwara, Norio, Fukuda, Mitsuhiro, Hamatani, Noriaki, Hatanaka, Kichiji, Kamakura, Keita, and Takahisa, Keiji. Titanium alloy as a potential low radioactivation vacuum material. United States: N. p., 2015. Web. doi:10.1116/1.4916934.
Kamiya, Junichiro, E-mail: kamiya.junichiro@jaea.go.jp, Hikichi, Yusuke, Kinsho, Michikazu, Ogiwara, Norio, Fukuda, Mitsuhiro, Hamatani, Noriaki, Hatanaka, Kichiji, Kamakura, Keita, & Takahisa, Keiji. Titanium alloy as a potential low radioactivation vacuum material. United States. doi:10.1116/1.4916934.
Kamiya, Junichiro, E-mail: kamiya.junichiro@jaea.go.jp, Hikichi, Yusuke, Kinsho, Michikazu, Ogiwara, Norio, Fukuda, Mitsuhiro, Hamatani, Noriaki, Hatanaka, Kichiji, Kamakura, Keita, and Takahisa, Keiji. Fri . "Titanium alloy as a potential low radioactivation vacuum material". United States. doi:10.1116/1.4916934.
@article{osti_22392188,
title = {Titanium alloy as a potential low radioactivation vacuum material},
author = {Kamiya, Junichiro, E-mail: kamiya.junichiro@jaea.go.jp and Hikichi, Yusuke and Kinsho, Michikazu and Ogiwara, Norio and Fukuda, Mitsuhiro and Hamatani, Noriaki and Hatanaka, Kichiji and Kamakura, Keita and Takahisa, Keiji},
abstractNote = {For the vacuum systems of high-intensity beam accelerators, low radioactivation materials with good vacuum characteristics and high mechanical strength are required. The titanium alloy Ti-6Al-4V was investigated as a potential low activation vacuum material with high mechanical strength for the fabrication of vacuum components, particularly the flanges of beam pipes, in the J-PARC 3 GeV synchrotron. The dose rate of Ti-6Al-4V when irradiated by a 400 MeV proton was observed to decrease more rapidly than that of stainless steel. Furthermore, the generated radioactive isotopes were nuclides with relatively short half-lives. The outgassing rate per unit area of Ti-6Al-4V was approximately 10{sup −8 }Pa m{sup 3}/s m{sup 2} after pumping for 100 h, which is the same as the typical value for stainless steel. Additionally, the hydrogen concentration in bulk Ti-6Al-4V was reduced to approximately 1 ppm by vacuum firing at 700 °C for 9 h; the mechanical strength was not reduced by this process. These results indicate that Ti-6Al-4V is a good candidate for use as a low activation vacuum material with high mechanical strength.},
doi = {10.1116/1.4916934},
journal = {Journal of Vacuum Science and Technology. A, Vacuum, Surfaces and Films},
issn = {0734-2101},
number = 3,
volume = 33,
place = {United States},
year = {2015},
month = {5}
}