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Metal-carbide eutectics with multiprincipal elements make superrefractory alloys

Materials with excellent high-temperature strength are now sought for applications in hypersonics, fusion reactors, and aerospace technologies. Conventional alloys and eutectic multiprincipal-element alloys (MPEAs) exhibit insufficient strengths at high temperatures due to low melting points and mic...

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Detalles Bibliográficos
Autores principales: Wei, Qinqin, Xu, Xiandong, Shen, Qiang, Luo, Guoqiang, Zhang, Jian, Li, Jia, Fang, Qihong, Liu, Chain-Tsuan, Chen, Mingwei, Nieh, Tai-Gang, Chen, Jianghua
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9269878/
https://www.ncbi.nlm.nih.gov/pubmed/35857469
http://dx.doi.org/10.1126/sciadv.abo2068
Descripción
Sumario:Materials with excellent high-temperature strength are now sought for applications in hypersonics, fusion reactors, and aerospace technologies. Conventional alloys and eutectic multiprincipal-element alloys (MPEAs) exhibit insufficient strengths at high temperatures due to low melting points and microstructural instabilities. Here, we report a strategy to achieve exceptional high-temperature microstructural stability and strength by introducing eutectic carbide in a refractory MPEA. The synergistic strengthening effects from the multiprincipal-element mixing and strong dislocation blocking at the interwoven metal-carbide interface make the eutectic MPEA not only have outstanding high-temperature strength (>2 GPa at 1473 K) but also alleviate the room-temperature brittleness through microcrack tip blunting by layered metallic phase. This strategy offers a paradigm for the design of the next-generation high-temperature materials to bypass the low–melting point limitation of eutectic alloys and diffusion-dominated softening in conventional superalloys.