A Novel Fe-enriched Lamella Sandwich Precipitate Formed in A Mg-Gd-Fe Alloy
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2021年第1期
论文作者：刘林林 ZHENG Yang 刘翠秀 孙威
文章页码：111 - 115
摘 要：A novel Fe-enriched lamella sandwich phase （χ-phase） has been found to precipitate along the basal （0001）Mg planes in the heat-treated Mg-Gd-Fe alloy and its structure is clearly revealed by means of atomic-resolution transmission electron microscopy.The layered χ-phase only has a thickness of mono-unit-cell and consists invariably of ten atomic layers stacking along the[0001]Mg direction,of which the outermost atomic layers had larger in-plane atom-pillar spacing than the inner layers.Fe/Gd atoms are mainly enriched in the outer four atomic layers in the χ-phase,forming two structurally unsymmetrical four-layer shells to sandwich the middle two Mg layers.An atomic model has been proposed for this layered sandwich-structured χ-phase.
刘林林，ZHENG Yang，刘翠秀，孙威
Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology
摘 要：A novel Fe-enriched lamella sandwich phase （χ-phase） has been found to precipitate along the basal （0001）Mg planes in the heat-treated Mg-Gd-Fe alloy and its structure is clearly revealed by means of atomic-resolution transmission electron microscopy.The layered χ-phase only has a thickness of mono-unit-cell and consists invariably of ten atomic layers stacking along the[0001]Mg direction,of which the outermost atomic layers had larger in-plane atom-pillar spacing than the inner layers.Fe/Gd atoms are mainly enriched in the outer four atomic layers in the χ-phase,forming two structurally unsymmetrical four-layer shells to sandwich the middle two Mg layers.An atomic model has been proposed for this layered sandwich-structured χ-phase.
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