TY - GEN
T1 - Properties of Age-Hardened Cu-Ni-Si Powdered Metal Parts from Blended Powders
AU - Stitt, Tyler
AU - Keen, Alena
AU - Waryoba, Daudi
N1 - Publisher Copyright:
© 2022 Advances in Powder Metallurgy and Particulate Materials
PY - 2022
Y1 - 2022
N2 - Sintered and age-hardened Cu-Ni-Si has been prepared from blended powders of copper, nickel, and silicon by press & sinter method. The powders were compacted to a density of 7.4 g/cm3, sintered at 860 °C (1580 °F) for 10 min in a 93% N2 + 7% H2 atmosphere. Age hardening was performed at 450 °C (840 °F) for 1-8 hours in an argon atmosphere. The results show that the transverse rupture strength (TRS) of parts heat-treated for 1 hour and age-hardened for 2 hours doubled compared to as-sintered parts. However, extended/over-aging was observed to decrease the TRS. The microhardness of as-sintered and age-hardened parts show a similar trend. This was attributed to the presence of nickel-silicide precipitates (Ni-Si and G-Ni2Si) in the matrix and around the grain boundaries. Although both as-sintered and age-hardened parts develop a random microtexture, the grain size of the age-hardened parts were about 62% smaller than as-sintered parts. The fine grain structure was also attributed to the pinning effects of the precipitates.
AB - Sintered and age-hardened Cu-Ni-Si has been prepared from blended powders of copper, nickel, and silicon by press & sinter method. The powders were compacted to a density of 7.4 g/cm3, sintered at 860 °C (1580 °F) for 10 min in a 93% N2 + 7% H2 atmosphere. Age hardening was performed at 450 °C (840 °F) for 1-8 hours in an argon atmosphere. The results show that the transverse rupture strength (TRS) of parts heat-treated for 1 hour and age-hardened for 2 hours doubled compared to as-sintered parts. However, extended/over-aging was observed to decrease the TRS. The microhardness of as-sintered and age-hardened parts show a similar trend. This was attributed to the presence of nickel-silicide precipitates (Ni-Si and G-Ni2Si) in the matrix and around the grain boundaries. Although both as-sintered and age-hardened parts develop a random microtexture, the grain size of the age-hardened parts were about 62% smaller than as-sintered parts. The fine grain structure was also attributed to the pinning effects of the precipitates.
UR - https://www.scopus.com/pages/publications/85184109549
UR - https://www.scopus.com/pages/publications/85184109549#tab=citedBy
M3 - Conference contribution
AN - SCOPUS:85184109549
T3 - Advances in Powder Metallurgy and Particulate Materials - 2022: Proceedings of the 2022 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2022
SP - 533
EP - 543
BT - Advances in Powder Metallurgy and Particulate Materials - 2022
PB - Metal Powder Industries Federation
T2 - 2022 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2022
Y2 - 12 June 2022 through 15 June 2022
ER -