B2 type ordered alloys with high symmetry have been considered as a possible attractive new material for application in fusion environments during severe irradiation field because of self-restoring phenomena during irradiation. Recently, a great deal of effort has been made to analyze the irradiation response by using multi-scale modeling. Our attention has been focused on utilization of the order-disorder transition. The irradiated state is associated with critical phenomena and can be expressed as two competing processes: ordering and disordering. A preliminary approach can be proposed to simply and quickly estimate the neutron-irradiated state of a B2 type ordered alloy as a function of temperature and displacement rate by using two measures of order for determining whether re-ordering under irradiation is preferred or not. © 2004 Elsevier B.V. All rights reserved.
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