Abstract
By applying the technique of local dosimetry and micro-indentation, the micro-hardness depth profile is directly determined for molybdenum specimens, which are bombarded by 10 MeV 4He +-ions at about 300°C to fluences of 1 × 10 20 ∼ 7 × 10 21 ion/m 2. The depth profile is similar to the damage energy profile and has a sharp peak with a front plateau. The degree of radiation hardening at peak and plateau regions differs in fluence dependence and in post-irradiation annealing behavior. This may be attributed to the role of implanted helium. The influence on radiation hardening of material purity, cold work and alloying with zirconium is also studied.
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