Nucleation of a solid phase on spherical refractory nanoparticles

Черепанов, А. Н.; Cherepanova, V. K.

doi:10.1063/1.5117445

Cited by 1 publication

(1 citation statement)

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“…Then the nucleation and growth of δ-Ni 2 Si precipitates occurs around the boundaries of these Cr 3 Si cores, leading to an enhanced nucleation rate. According to the calculation and experiments that has been reported [39,40], the nucleation barrier and the critical nucleus size is reduced in the heterogeneous nucleation process, thereby the nucleation rate is accelerated. Therefore, the formation of DP is suppressed by the formation of Cr 3 Si cores before δ-Ni 2 Si, which is in good accordance with the experimental results of SEM and TEM observations.…”

Section: The Influence Of Addition Of Cr On Precipitation Processmentioning

confidence: 93%

The Precipitation Behavior of a Cu-Ni-Si Alloy with Cr Addition Prepared by Heating-Cooling Combined Mold (HCCM) Continuous Casting

et al. 2022

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A Cu-Ni-Si alloy containing (Ni + Si) ≥ 5 wt.%, with the addition of Cr, is fabricated by HCCM continuous casting and two steps of aging treatment. The evolution of the microstructures and precipitations, as well as the effect of Cr atoms, is studied in this paper. An excellent combination of mechanical property (hardness HV 250–270) and electrical conductivity (46–47 %IACS) is obtained by the first step aging at 500 °C for 0.25 h and the second step aging at 450 °C for 1 h. The cold rolling and aging process are directly conducted on the solution treated specimens fabricated by HCCM continuous casting process without hot deformation, since the excellent homogeneity of matrix is obtained by solution treatment with δ-Ni2Si precipitates dissolved. It is found that the formation of discontinuous precipitation is suppressed by the formation of Cr3Si cores of 5–10 nm before the formation δ-Ni2Si. Then, the nucleation and growth of δ-Ni2Si precipitates occurs around the boundaries of these Cr3Si cores, leading to an enhanced nucleation rate. This study provides a promising direction for the design and optimization of Cu-Ni-Si alloys based on the further understanding of the effect of the addition of Cr.

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Section: The Influence Of Addition Of Cr On Precipitation Processmentioning

confidence: 93%