Publication Date:
2016-06-23
Description:
The composition, crystal structure and precipitation crystallography of a newly found precipitate are characterized by Cs-corrected scanning transmission electron microscopy. The composition of the plate-like precipitate could be expressed as MgxAl2−xGd (x= 0.38), and its crystal structure is the same as the face-centered cubic type Laves phases Mg2Gd and Al2Gd, with a lattice parameter of 7.92 Å (space group No. 227, Fdoverline 3m). The orientation relationship between the matrix and precipitate is found to be (0001)m//(111)pand [10overline 10]m//[1overline 10]p, and the habit plane is parallel to the (0001)m//(111)pplane. In addition, this preferred crystallography of phase transformation is well explained on the basis of the atomic matching at the interface.
Print ISSN:
0021-8898
Electronic ISSN:
1600-5767
Topics:
Geosciences
,
Physics
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