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Remarkable high-temperature softening resistance of a Cu-Cr-Nb alloy by solubilizing Ta in the Cr2Nb Laves phase
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DOI：10.1016/j.scriptamat.2026.117384.png)
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Abstract
En 中文
Developing copper alloys with high-temperature strength and thermal conductivity is crucial for commercial aerospace. In this work, tantalum (Ta), exhibiting low diffusion coefficient in Cu, was introduced in the Cu-Cr-Nb alloy via laser powder bed fusion (LPBF) and aging. Ta solubilizes into the Laves Cr2Nb structure and forms fine Cr2(Ta, Nb) particles which effectively pin dislocations and suppress recrystallization of the alloy. Small-angle neutron scattering demonstrated that the coarsening coefficient of Cr2(Ta, Nb) was reduced by 58% compared to the Cr2Nb counterpart at 800°C. Consequently, an excellent combination of yield strength of 256 MPa and thermal conductivity of 283 W/m·K was achieved at 600°C. The softening temperature of the Ta-doped alloy reached 839°C. The present study shows a viable way of constructing high-strength and thermally stable Cu alloys by solubilizing slow-diffusing atoms in the precipitates.
Keywords:
Ta-doped Cu-Cr-Nb alloy
high-temperature strength
thermal conductivity
Laves phase
softening resistance
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5.6
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5.1W
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