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α-Brass: 70 wt.% Cu, 30 wt.% Zn
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These straight edged twins are annealing twins. Annealing twins are stacking defects in the stacking of the {111} close-packed planes.

Annealing twins have straight sides (unlike martensitic deformation twins which are lenticular).

α-Brass: 70 wt.% Cu, 30 wt.% Zn
This micrograph is of a lower magnification. See also the DoITPoMS micrograph library entry.

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