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The dispersoid phase Al_(20)Cu_2Mn_3 in a 2024 Al alloy is commonly composed of twins,An ob-servation of corresponding high resolution image shows that the twin boundary plane is a glideplane other than mirror one.Two neighbouring components of twins are not symmetry of re-flection or rotation,but of glide reflection.The“diamond”glide plane is(101)and the glidevector is(1/4)(-).Components of twins in the phase take shape of prism with thelongitudinal edge being parallel to[010]and side faces being{101}and{100}.
The dispersoid phase Al 20 Cu 2 Mn 3 in a 2024 Al alloy is typically composed of twins, An ob-servation of corresponding high resolution images shows that the twin boundary plane is a glideplane other than mirror one. Two neighbouring components of twins are not symmetry of re-flection or rotation, but of glide reflection. The “diamond” glide plane is (101) and the glidevector is (1/4) (-). Components of twins in the phase take shape of prism with the longitudinal edge being parallel to [010] and side faces being {101} and {100}.