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alloys is faster than that of Fe-5OCr alloy. All of the loops formed at temperatures ranging from 573 K to 973 K, even in the (o+ a + a') phase regions in thermal equilibrium, have moir6 fringe contrast due to precipitates identified as a' phase. The contrast is very weak in the Fe-5OCr alloy because of coarse distribution of precipitates, while the a' phase formed in low purity alloys has somewhat larger interplanar spacings that are modified by interstitial impurities. The a' phase formation on the loops can be understood by radiation-induced segregation of chromium and interstitial impurity atoms.

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