Study of the radiation damage effect on Titanium metastable beta alloy by high intensity proton beam
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A foil of a metastable Titanium alloy Ti-15V-3Cr-3Sn-3Al was irradiated at the J-PARC neutrino experimental facility with 1.4×1020 30 GeV protons at low temperature (100~130oC 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 beam center is about 0.06~0.12 displacement per atom. A high density (>1023 m-3) of a few nm-sized precipitates was observed by TEM studies, which is thought to be early stages of -phase formation, during the athermal process to fabricate the alloy. They did not appear to change substantially after irradiation with protons. In the irradiated specimen, we could not identify obvious signature of radiation damage distributed over proton beam profile. Meanwhile, very small, nanometer-scale black dots were seemingly visible at a low density in the most highly irradiated region, and could be small dislocation loops. The micro-indentation test indicated that the radiation exposure led to only about 6% increase in micro-hardness at beam center. Atom prove tomography reveals compositional fluctuation of 10 at% of amplitude less than 5 nm in both before and after irradiation, which may also indicate presence of rich -phase. These experimental results suggest this specific alloy may exhibit radiation damage resistance due to the existence of a high density of small precipitates, and further studies with higher exposure is worth to be conducted.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Grant/Contract Number:
- AC02-07CH11359; AC05-76RL01830
- OSTI ID:
- 1434805
- Alternate ID(s):
- OSTI ID: 1437028; OSTI ID: 1496025; OSTI ID: 1515165
- Report Number(s):
- PNNL-SA-124685; FERMILAB-PUB-18-736-AD; PNNL-SA-134718; S2352179117300935; PII: S2352179117300935
- Journal Information:
- Nuclear Materials and Energy, Journal Name: Nuclear Materials and Energy Vol. 15 Journal Issue: C; ISSN 2352-1791
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
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