The microstructure, mechanical-thermal properties and softening resistance of Y4Al2O9 dispersion-strengthened Cu alloy

Zhou, Yirong; Yi, Guoqiang; Zhang, Peng; Yin, Shengming; Xue, Lihong; Yan, Yunjun

doi:10.1016/j.jnucmat.2021.153484

Cited by 12 publications

(1 citation statement)

References 32 publications

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“…It is hypothesized that the introduction of nanoscale oxide particles may allow the increase of the service temperatures from approx. 700 • C for GRCop alloys [32] up to 800 • C for dispersionstrengthened copper alloys [98] without reducing conductive properties [99]. We chose Y 2 O 3 as reinforcement phase due to its higher thermodynamic stability than commonly used Al 2 O 3 in GlidCop alloys [100] and select two Cu-Cr-Nb alloys with different niobium contents to study the influence of increased niobium contents on the formation of Cr 2 Nb precipitates and the chemistry of the introduced yttrium oxide nanoparticles, potentially forming cubic-structured Y 3 NbO 7 , as observed in stainless steels [101].…”

Section: Introductionmentioning

confidence: 99%

Laser Additive Manufacturing of Oxide Dispersion-Strengthened Copper–Chromium–Niobium Alloys

Wilms

Rittinghaus

2022

JMMP

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Copper is a key material for cooling of thermally stressed components in modern aerospace propulsion systems, due to its high thermal conductivity. The use of copper materials for such applications requires both high material strength and high stability at high temperatures, which can be achieved by the concept of oxide dispersion strengthening. In the present work, we demonstrate the oxide reinforcement of two highly conductive precipitation-strengthened Cu-Cr-Nb alloys using laser additive manufacturing. Gas-atomized Cu-3.3Cr-0.5Nb and Cu-3.3Cr-1.5Nb (wt.%) powder materials are decorated with Y2O3 nanoparticles by mechanical alloying in a planetary mill and followed by consolidation by the laser additive manufacturing process of laser powder bed fusion (L-PBF). While dense specimens (>99.5%) of reinforced and nonreinforced alloys can be manufactured, oxide dispersion-strengthened alloys additionally exhibit homogeneously distributed oxide nanoparticles enriched in yttrium and chromium next to Cr2Nb precipitates present in all alloys examined. Higher niobium contents result in moderate increase of the Vickers hardness of approx. 10 HV0.3, while the homogeneously dispersed nanometer-sized oxide particles lead to a pronounced increase of approx. 30 HV0.3 in material strength compared to their nonreinforced counterparts.

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