Abstract
Titanium and Ti-6A1-4V were electron-beam welded and neutron irradiated in JMTR at 423 and 543 K. Mechanical properties were measured with micro-Vickers hardness tests and micro-tensile tests on base metal, heat affected zone (HAZ) and weld metal. Microstructures were inspected by means of optical and transmission electron microscopy. Significant irradiation hardening was observed in both materials. In the case of pure Ti, irradiation hardening showed a tendency to saturate at 5 × 10 24 n/m 2 . The irradiation hardening in the weld metal was about two times larger than that in the base metal for pure Ti. Similar irradiation hardening and a significant decrease in elongation occurred for Ti-6A1-4V. Radiation-induced black-dot formation was observed in Ti-6Al-4V. These were identified as radiation induced β-phase precipitates and interstitial type dislocation loops. In pure Ti, dislocation loops were produced by the neutron irradiation. The radiation induced hardening can be understood based on the dispersed barrier hardening model.
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