Abstract
This study primarily investigated the microstructural and mechanical properties of Cu-Ni-Be alloys subjected to thermomechanical treatments at 30% and 75% deformation levels. Precipitates in Cu-Ni-Be alloys are dominated by Ni-Be phases. The misfit between the Ni-Be phase/Cu interface is 0.12%. Experimental observations have revealed the existence of three classical orientation relationships between precipitates and the matrix: (110)p//(100)α; [110]p//[001]α, (110)p//(010)α; [110]p//[001]α, and (110)p//(100)α; [001]p//[001]α (p: precipitates, α: α-Cu supersaturated solid solution). Additionally, a fourth orientation relationship, (110)p//(1-1-1)α; [110]gp//[1-1-1]α (gp: Guinier-Preston), induced by deformation, has also been identified. The width of the second phase was found to be two to three atomic layers. Under 75% deformation, a substantial amount of the γ' phase emerged at grain boundaries. Notably, at neither 30% nor 75% deformation levels were prominent cellular structures observed.