The effects of Ru, W, and Re on the temporal evolution of the gamma prime precipitates in a Ni-Cr-Al alloy were investigated by threedimensional atom probe (3DAP) microscopy. The spatial distribution of the gamma prime precipitates in a model Ni-8.5Cr-10Al alloy was investigated using atomic force microscopy (AFM). We reported on the alloys’ Ni-8.5Cr-10Al-2Ru atomic percent (at%), Ni-8.5Cr-10Al-1Ru-1Re at%, and Ni8.5Cr-10Al-0.5Ru-0.5Re-1W at%, which were aged isothermally in the gamma/gamma prime two-phase field at 1073K for 4 and 16 hours each. We also reported on a Ni-8.5Cr10Al alloy, which also was aged isothermally in the gamma/gamma prime two-phase field at 1073K for 15-minute, one-hour, and fourhour periods. A sample for this alloy that was not aged or quenched also was investigated. The partitioning and spatially resolved phase concentrations across the gamma prime precipitates and gamma matrix were obtained from the 3DAP reconstructions. At the concentrations studied, the addition of Re to the NiCrAlRu alloy had little influence on the partitioning ratios of Ni, Al, Cr, and Ru. The addition of W to the NiCrAlRuRe alloy did not affect the partitioning ratios of Ni, Re, and Ru but did cause stronger partitioning of Cr to the matrix and Al to the precipitate. The number densities calculated from the AFM images for the model Ni-8.5Cr-10Al alloy for the zero-hour, 15-minute, one-hour, and fourhour aging times were 3.91 x 1022, 1.48 x 1022, 2.88 x 1021, and 9.83 x 1020 m-3, respectively

Last modified

• 07/12/2018

Creator

• Dieter Isheim
• Luis de la Cruz
• Chantal Sudbrack
• David Seidman

DOI

• https://doi.org/10.21985/N2K71K

Keyword

• Volume 1

Date created

• 2004

Resource type

• Article

Rights statement

• In Copyright