期刊
NANO LETTERS
卷 17, 期 3, 页码 1569-1574出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b04716
关键词
High-entropy alloys; nanocrystalline; high temperature; strength; grain boundary; stability
类别
资金
- Swiss National Science Foundation [200021_143633, 200021_140532]
- Swiss National Science Foundation (SNF) [200021_140532, 200021_143633] Funding Source: Swiss National Science Foundation (SNF)
Metals with nanometer-scale grains or nanocrystalline metals exhibit high strengths at ambient conditions, yet their strengths substantially decrease with increasing temperature, rendering them unsuitable for usage at high temperatures. Here, we show that a nano crystalline high-entropy alloy (HEA) retains an extraordinarily high yield strength over 5 GPa up to 600 degrees C, 1 order of magnitude higher than that of its coarse-grained form and 5 times higher than that of its single crystalline equivalent. As a result, such nanostructured HEAs reveal strengthening figures of merit normalized strength by the shear modulus above 1/50 and strength to-density ratios above 0.4 MJ/kg, which are substantially higher than any previously reported values for nanocrystalline metals in the same homologous temperature range, as well as low strain-rate sensitivity of similar to 0.005. Nanocrystalline HEAs with these properties represent a new class of nanomaterials for high-stress and high-temperature applications in aerospace, civilian infrastructure, and energy sectors.
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