Journal
MATERIALS RESEARCH LETTERS
Volume 11, Issue 3, Pages 169-178Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2022.2133977
Keywords
Niobium alloys; refractory carbide; eutectic structure; mechanical properties; strengthening mechanism
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A novel lightweight and thermally-stable Nb alloy has been designed by combining the notion of eutectics and refractory carbide, exhibiting high-temperature specific compressive strength and retained engineering plasticity higher than existing Nb alloys.
Nb alloys with high strength and relatively low density are sought for high-temperature applications. However, due to strain softening, conventional Nb alloys often exhibit insufficient high-temperature strengths. Here we report a strategy to design a novel lightweight and thermally-stable Nb alloy by combining the notion of eutectics and refractory carbide. The resulting Nb2MoWC0.96 eutectic alloy exhibits a high-temperature specific compressive strength of 77.2 MPa/.cm(3).g(1) at 1673 K with a retained engineering plasticity of 37.5%, both are notably higher than the existing Nb and Nb-containing alloys. This work demonstrates that both the strength and plasticity of Nb alloys can be further optimized with refractory carbide and eutectics. [GRAPHICS] IMPACT STATEMENT Combining the notion of eutectics with refractory carbide makes high strength, large plasticity Nb alloy with good microstructural stability.
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