Authors: Y. Ortega; N. de Diego; J. A. Jiménez; J. del Río

Source: Philosophical Magazine Letters, Volume 84, Number 9, September 2004 , pp. 547-554(8)

Publisher: Taylor and Francis Ltd

Abstract:

The recovery behaviour of vacancy-type defects created at 1000°C in Fe 3 (Al 1- x Si x ) alloys has been investigated by positron-lifetime measurements in samples cooled to room temperature by water quenching, air quenching and furnace cooling. In addition, a set of samples was aged for one week at 520°C. After water quenching, measurements reveal a high concentration of thermal vacancies, and from the decrease of the average positron lifetime it is inferred that vacancy recovery is strongly composition-dependent. Greater decreases of the positron lifetime were found for Si-rich samples, suggesting diffusion enhancement as the Si concentration increases. For the Fe 3 Al alloy, the retained vacancy concentration depends strongly on the cooling rate. This is related to atomic ordering and a rebuilding of the D0 3 structure.

Document Type: Research article

DOI: http://dx.doi.org/10.1080/09500830412331313338

Publication date: 2004-09-01

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