Abstract
The microstructure evolution, phase interface relationships, and corresponding hardness changes of discontinuous precipitation in Cu-15Ni-8Sn alloy during the aging process were investigated. The samples were isothermally aged for 15 h at 500–700 °C to yield discontinuous precipitates with varying lamellar spacings. The results showed that discontinuous precipitation with a lamellar structure is composed of the α-Cu phase and γ-DO3 phase, which has an incoherence interface and satisfies the K-S orientation relationship. With the increase of aging temperature, the lamellar spacing of the discontinuous precipitation increases, the length of lamellar shortens, and the lamellar nature weakens. Simultaneously, the discontinuous coarsening reaction is accelerated. The addition of the trace Co element can inhibit the formation of discontinuous precipitation and discontinuous coarsening phase. Co enrichment was found in the γ-DO3 phase, which can alter the lamellar spacing and then affect the hardness of the Cu-15Ni-0.5Co alloy. In addition, the hardness of discontinuous precipitation in the Cu-15Ni-8Sn- (0.5Co) alloy is negatively correlated with the lamellar spacing and can follow the Hall-Petch type relation.
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