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Above about 450°C (or perhaps a lower limit lower with increasing dose) the coarser microstructures and phases become increasingly unstable and tend to recover and coarsen, while precipitation of grain boundary Laves phases occurs. This evolution can lead to both softening and non-hardening embrittlement. Irradiation and applied stresses may accelerate and lower the temperature range of the time-temperature C-curves describing these transformations by a variety of mechanisms, including radiation enhanced diffusion.

3 Alloy stability The strategy for future improvement in modeling the stability of multiphase alloys under irradiation requires considerable theoretical progress and much computational work. One approach to assessing the stability of a given phase under irradiation is to study the growth and/or decay rate of a model precipitate in a model solid solution under irradiation. Phase field models [12] provide the appropriate tool, provided essential progress is made to implement atomistic mobility coefficients in these models.

Second, the Department of Energy has had since 1996 a simulation program leading to the certifiabilitiy of nuclear weapons [1]. Lessons of enormous importance in terms of hardware platforms, software engineering, validation and verification, and the sociology of sizeable multidisciplinary code teams, have been learned from this effort, many of which are transferable, with a much compressed learning curve, to a simulation program for advanced materials [1]. Third, the “science of simulation” is itself rapidly improving.

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