Method of judging practical conditions for use of an ordered alloy under irradiation environments
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United States of America Patent
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Apr 29, 2008
Grant Date -
Jun 9, 2005
app pub date -
Nov 24, 2004
filing date -
Dec 5, 2003
priority date (Note) -
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Abstract
An irradiated state diagram that expresses a relation of a degree of long range order S to a variable R of an irradiated state related to a damage rate and an irradiation temperature is prepared according to an ordered structure of an alloy on basis of an evaluation formula related to an effect of irradiation on an irradiated state of the alloy by using, as parameters, a first threshold value S.sub.th1 at which the degree of long range order begins to decrease greatly under irradiation, a second threshold value S.sub.th2 at which the degree of long range order substantially reaches equilibrium after this decrease, and a degree of long range order in an equilibrium state S.sub.eq. An R-value is calculated and an S-value corresponding to the R-value is found. An S.sub.th1-value, an S.sub.th2-value and an S.sub.eq-value at the R-value are found and compared.
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