Three-dimensional size and orientation of the precipitates in AZ91 magnesium alloys measured by TEM techniques |
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Authors: | Zheng Ou Ma Jia-Yan Wang Jian-Bo Zhou Jia-Ping Jin Lei Zhao Dong-Shan and Wang Ren-Hui |
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Institution: | Department of Physics and Key Laboratory of Acoustic and Photonic Materials and Devices of Ministry of Education, Wuhan University, Wuhan 430072, China;Centre for Electron Microscopy, Wuhan University, Wuhan 430072, China |
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Abstract: | Knowledge of the microscopic structure, including three-dimensional
(3-D) size and orientation of the precipitates, is essential to
fully understand the mechanical properties of the magnesium
alloys and designing the alloys with better performance. Analytical
TEM with high spatial resolution offers the simultaneous
measurements of 3-D size, structure, orientation, composition of the
precipitates from one typical sample along an established
crystallographic axis. Besides popular Burgers orientation
relationship (OR), other ORs such as Pitsch--Schrader OR, Crawley
OR, Potter OR and a new OR with the form of 0001]α
1.0° from 311]γ and (11\bar 20)α
2.0° from (03\bar 3)γ between the magnesium
matrix and the precipitate γ -Mg17Al12 are
identified by TEM imaging and diffraction techniques. As a case study,
the thicknesses of the individual precipitates with Burgers OR are
further measured to be 100--200~nm through both electron energy-loss
spectroscopy and x-ray energy dispersive spectroscopy combining
differential x-ray absorption and extrapolation, which are in
agreement with the overall 3-D size statistic distribution results
obtained through analysing various samples along various directions.
Furthermore, the fabricated wedge-shape structure provides a
platform on which to study the dependence of the interfacial strain on the
variation of the thickness. |
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Keywords: | transmission electron
microscopy microstructure Mg electron energy loss spectroscopy |
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