期刊
SCIENCE ADVANCES
卷 8, 期 27, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abo2068
关键词
-
资金
- China Postdoctoral Science Foundation [2021M701135]
- Excellent Postdoctoral Innovative Talents Program of Hunan Province [2021RC2043]
- National Natural Science Foundation of China [51831004, 12072109]
- Fundamental Research Funds for the Central Universities grant [531118010450]
- State Key Laboratory of Advanced Metals and Materials, University of Science and Technology Beijing [2021-Z09]
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China
- State Key Program of the National Natural Science Foundation of China [51932006]
- National Key R&D Program of China [2021YFB3802300]
- National Natural Science Foundation [52171045]
- Hong Kong Government through Structural-Material Development Fund (SMDF) [9360160]
- U.S. National Science Foundation [DMR-1804320, DMR-1408722]
This study reports a strategy to achieve exceptional high-temperature microstructural stability and strength by introducing eutectic carbide in a refractory multiprincipal-element alloy (MPEA). The eutectic MPEA has outstanding high-temperature strength and alleviates room-temperature brittleness through microcrack tip blunting. This offers a new paradigm for the design of next-generation high-temperature materials.
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据