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Transmission electron microscopy analysis of the crystallography of precipitates in Mg–Sn alloys aged at high temperatures
Author(s) -
Nie Xin,
Guan Yimin,
Zhao Dongshan,
Liu Yu,
Gui Jianian,
Li Luying,
Wang Jianbo
Publication year - 2014
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s160057671401958x
Subject(s) - transmission electron microscopy , crystallography , reciprocal lattice , alloy , materials science , dark field microscopy , high resolution transmission electron microscopy , zone axis , precipitation , electron microscope , electron diffraction , analytical chemistry (journal) , diffraction , chemistry , microscopy , metallurgy , nanotechnology , physics , optics , chromatography , meteorology
The crystallographic orientation relationships (ORs) of precipitated β‐Mg 2 Sn particles in Mg–9.76 wt% Sn alloy aged at 573 K for 5 h, corresponding to its peak hardness, were investigated by advanced transmission electron microscopy (TEM). OR‐3 of (110) β //(0001) α and [11] β //[110] α and OR‐4 of (110) β //(0001) α and [001] β //[20] α are the key ORs of β‐Mg 2 Sn particles in the alloy. The proportions of β‐Mg 2 Sn particles exhibiting OR‐3 and OR‐4 were determined as 75.1 and 24.3%, respectively. Crystallographic factors determined the predominance of OR‐3 in the precipitated β‐Mg 2 Sn particles. This mechanism was analyzed by a three‐dimensional invariant line model constructed using a transformation matrix in reciprocal space. Models of the interface of precipitated β‐Mg 2 Sn and the α‐Mg matrix were constructed via high‐resolution TEM and atomic resolution high‐angle annular dark‐field scanning TEM.