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金属学报 1992
HIGH RESOLUTION STUDY OF TWINS IN Al_(20)Cu_2Mn_3 PHASE
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Abstract:
The dispersoid phase Al_(20)Cu_2Mn_3 in a 2024 Al alloy is commonly composed of twins. An observation of corresponding high resolution image shows that the twin boundary plane is a glide plane other than mirror one. Two neighbouring components of twins are not symmetry of reflection or rotation, but of glide reflection. The "diamond" glide plane is (101) and the glide vector is (1/4)(a--c). 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}.
