Characterization of quenched-in vacancies in Fe-Al alloys

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• 作者：J. 膶í ; 啪ek^a ; ^{Jakub.Cizek@mff.cuni.cz} ; F. Luk&aacute ; 膷^a ; I. Proch&aacute ; zka^a ; R. Ku啪el^a ; Y. Jir&aacute ; skov&aacute ; ^b ; D. Jani膷kovi膷^c ; W. Anwand^d ; G. Brauer^d
• 关键词：Fe&ndash ; Al alloys ; Vacancies ; Positron annihilation
• 刊名：Physica B
• 出版年：2012
• 期刊代码：53_09214526
• 类别：ph
• 出版时间：15 July, 2012
• 卷：407
• 期：14
• 页码：2659-2664
• 文件大小：738 K

摘要

Physical and mechanical properties of Fe-Al alloys are strongly influenced by atomic ordering and point defects. In the present work positron lifetime (LT) measurements combined with slow positron implantation spectroscopy (SPIS) were employed for an investigation of quenched-in vacancies in Fe-Al alloys with the Al content ranging from 18 to 49 at.%. The interpretation of positron annihilation data was performed using ab-initio theoretical calculations of positron parameters. Quenched-in defects were identified as Fe-vacancies. It was found that the lifetime of positrons trapped at quenched-in defects increases with increasing Al content due to an increasing number of Al atoms surrounding the Fe vacancies. The concentration of quenched-in vacancies strongly increases with increasing Al content from in (i.e. the alloy with the lowest Al content studied) up to in (i.e. the alloy with the highest Al content studied in this work).