Effects of Nb Addition and Different Cooling Methods on Microstructures and Properties of Cu-Cr Alloys

Yang, Xin; Wang, Cheng; Yang, Lin; Zou, Juntao

doi:10.1007/s11665-020-05017-z

Cited by 11 publications

(3 citation statements)

References 34 publications

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“…The presence of Cr-rich- [14,26] and Cr-Nb-rich precipitates [22,[24][25][26][27][28] are frequently observed in Cu-Cr-Nb alloys. The latter particles may correspond to Cr 2 Nb laves phase, which is also found together with Cr-rich precipitates in laser-directed energy deposition (L-DED) processed Cu-3.4Cr-0.6Nb (at.%) alloy [88].…”

Section: Alloymentioning

confidence: 99%

“…Among others, the commercial copper alloys AMZIRC [14,20], CuCr1Zr, and NARloy-Z [20] are based on these developments. The alloys GRCop-84 and GRCop-42, both developed by NASA [20], are based on the ternary Cu-Cr-Nb system, offering higher strength and improved creep properties than the alloys NARloy-Z and AMZIRC by the formation of C15 structured Cr 2 Nb laves phases [14,[20][21][22][23][24][25]. The high affinity of Cr and Nb in combination with low 2 of 15 solubility in the copper matrix at room temperature allow the creation of a pure Cu matrix with dispersed Cr 2 Nb phases [26,27] after heat treatment [28].…”

Section: Introductionmentioning

confidence: 99%

“…However, due to the small size of both nanoparticle species, EDS measurements were performed on sporadically found clusters of the respective nanoparticle species and therefore large amounts of copper are detected. (Table4).The presence of Cr-rich-[14,26] and Cr-Nb-rich precipitates[22,[24][25][26][27][28] are frequently observed in Cu-Cr-Nb alloys. The latter particles may correspond to Cr 2 Nb laves phase, which is also found together with Cr-rich precipitates in laser-directed energy deposition (L-DED) processed Cu-3.4Cr-0.6Nb (at.%) alloy[88].…”

mentioning

confidence: 99%

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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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