The precipitates responsible for the age-hardening effect in Cu-1.11%Mn-0.28%P alloy have been studied using transmission electron microscopy (TEM). The precipitates in the aged alloy have a rod shape and a composition of Mn_(2)P having a hexagonal structure. Their axial direction is [0001]_(p) and is parallel to <001>_(m) of copper matrix, where subscripts 'm' and 'p' signify matrix and precipitate, respectively. Orientation relationships between the precipitates and the matrix are as follows: [001]_(m)//[0001]_(p)//rod axis and (010)_(m)//(1340)_(p) [001]_(m)//[0001]_(p)//rod axis and (010)_(m)//(1230)_(p)
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