Abstract
Aluminum-bearing APMT™ steel is being considered as a potential fuel cladding material for a novel light water reactor design. Elevated temperature tensile tests were performed with APMT™ steel to examine the basic mechanical behavior. Serrations observed in the temperature range of 523–673K during tensile deformation of APMT™ within a range of strain rates are attributed to dynamic strain aging (DSA) with negative strain rate sensitivity. The DSA effect was due to interactions between mobile dislocations and interstitial solute atoms whose mobility was affected by the presence of high concentration of substitutional solute atoms.
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