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Title: Study of the radiation damage effect on Titanium metastable beta alloy by high intensity proton beam

Here, a foil of a metastable β Titanium alloy Ti-15V-3Cr-3Sn-3Al was irradiated at the J-PARC neutrino experimental facility with 1.4 × 10 20 30 GeV protons at low temperature (100–130°C at most), and microstructural characterization and hardness testing were conducted as an initial study on the radiation damage effects of Titanium alloy by the high energy proton beam exposure. Expected radiation damage at the beam center is about 0.06–0.12 displacement per atom. A high density (> 10 23 m –3) of a nanometer-sized precipitate was observed by TEM studies, which would be identified as martensite α-phase and athermal ω-phase formed during the solution-treatment process to fabricate metastable β alloy. They did not appear to change substantially after irradiation with protons. In the irradiated specimen, we could not identify an obvious signature of radiation damage distributed along the proton beam profile. Very small, nanometer-scale black dots were present at a low density in the most highly irradiated region, and may be small dislocation loops formed during irradiation. The micro-indentation test indicated that the radiation exposure led to tiny increase in Vickers micro-hardness of ΔH V= 20 at beam center. Atom probe tomography reveals compositional fluctuations that reach a maximum amplitude ofmore » 10 at% Ti within a space of < 5 nm both before and after irradiation, which may also indicate presence of rich precipitates. These experimental results suggest this specific β alloy may exhibit radiation damage resistance due to the existence of a high density of nano-scale precipitates, but further studies with higher exposure are required to explore this possibility.« less
Authors:
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  1. J-PARC Center, Tokai-mura (Japan)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  4. Kavli IPMU, Kashiwa (Japan); TRIUMF, Vancouver, BC (Canada)
  5. York Univ., Ontario (Canada)
  6. Univ. of Toronto, Toronto, ON (Canada)
  7. TRIUMF, Vancouver, BC (Canada)
  8. Univ. of Colorado, Boulder, CO (United States)
  9. STFC Rutherford Appleton Lab., Oxfordshire (United Kingdom)
  10. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Report Number(s):
PNNL-SA-124685
Journal ID: ISSN 2352-1791; PII: S2352179117300935
Grant/Contract Number:
AC02-07CH11359; AC05-76RL01830
Type:
Published Article
Journal Name:
Nuclear Materials and Energy
Additional Journal Information:
Journal Name: Nuclear Materials and Energy; Journal ID: ISSN 2352-1791
Publisher:
Elsevier
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Titanium alloy; Proton beam; Radiation damage; Target; Beam window
OSTI Identifier:
1434805
Alternate Identifier(s):
OSTI ID: 1437028