The crystal structure of β' martensite in a Cu–11.7% alloy has been studied by transmission electron microscopy and electron diffraction. The structure has a monoclinic lattice, whose unit consists of 6 close-packed layers having a superlattice. It can also be described as an orthorhombic lattice having lattice constants of a=4.49 Å, b=5.19 Å, c=38.2 Å, (a: b: c=√3: 2: 18√\tfrac23), and consisting of 18 layers A
B'C
B'C
A'C
A'B
A'B
C'B
C'A
C'A
B', where the positions of atoms in each layer (a
b plane) are
(A) Al:(00); Cu:(0\tfrac12), (\tfrac12\tfrac14), (\tfrac12\tfrac34), (A')=(A)+(\overrightarrow0\tfrac12),
(B)=(A)+(\overrightarrow\tfrac130), (B')=(B)+(\overrightarrow0\tfrac12),
(C)=(A)+(\overrightarrow\tfrac230), (C')=(C)+(\overrightarrow0\tfrac12),
where (A)+(\overrightarrow\tfrac130) means that all the atoms in layer `A' are displaced by the amount of vector (\overrightarrow\tfrac130).
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