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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, 
). The orientation relationship between the matrix and precipitate is found to be (0001)m//(111)p and [10
0]m//[10]p, and the habit plane is parallel to the (0001)m//(111)p plane. In addition, this preferred crystallography of phase transformation is well explained on the basis of the atomic matching at the interface.
). The orientation relationship between the matrix and precipitate is found to be (0001)m//(111)p and [10
0]m//[10]p, and the habit plane is parallel to the (0001)m//(111)p plane. In addition, this preferred crystallography of phase transformation is well explained on the basis of the atomic matching at the interface.
