Abstract
ABSTRACTThe phase transition of Fe1-xCrx alloys after thermal aging at 748 K has been investigated by means of positron annihilation spectroscopy. It was observed that the implanted positrons preferentially annihilate with Fe electrons. The Cr concentration dependence of the W-parameter before thermal aging is quantitatively described by a preferential positron annihilation model within the first two coordination shells. After thermal aging, the W-parameter increased for all alloys, probably on account of an enhanced preferential positron annihilation of Fe atoms according to the growth of Cr-rich phases by thermal aging. Simultaneously, Fe-rich phases were formed and the interface condition between the Fe- and Cr-rich phases changed, providing another mechanism by which positrons are preferentially annihilated with Fe electrons in the Fe-rich phases.
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