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

• DOI: 10.1016/j.nme.2018.04.006
• Publication Date: 2018-04-26T08:13:07Z
• Authors: T. Ishida; E. Wakai; M. Hagiwara; S. Makimura; M. Tada; D.M. Asner; A. Casella; A. Devaraj; D. Edwards; R. Prabhakaran; D. Senor; M. Hartz; S. Bhadra; A. Fiorentini; M. Cadabeschi; J. Martin; A. Konaka; A. Marino; A. Atherthon; C.J. Densham; M. Fitton; K. Ammigan; P. Hurh
• Keywords: radiation damage; Titanium alloy

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 × 1020 30 GeV protons low temperature (100–130°C most), and microstructural characterization hardness testing were conducted as an initial study on radiation damage effects by high energy proton beam exposure. Expected center is about 0.06–0.12 displacement per atom. density (> 1023 m−3) nanometer-sized precipitate observed TEM studies, which would be identified martensite α-phase athermal ω-phase formed during solution-treatment process to fabricate alloy. They did not appear change substantially after irradiation protons. In specimen, we could identify obvious signature distributed along profile. Very small, nanometer-scale black dots present in most highly region, may small dislocation loops irradiation. The micro-indentation test indicated that exposure led tiny increase Vickers micro-hardness ΔHV= 20 center. Atom probe tomography reveals compositional fluctuations reach maximum amplitude 10 at% Ti within space < 5 nm both before irradiation, also indicate presence rich precipitates. These results suggest this specific exhibit resistance due existence nano-scale precipitates, but further studies higher are required explore possibility.