High fracture toughness in a hierarchical nanostructured zirconium

High fracture toughness in a hierarchical nanostructured zirconium
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分级纳米结构锆具有高断裂韧性

DOI:
10.1016/j.msea.2014.03.110
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发表时间:
2014-06
期刊:
Materials Science and Engineering A
影响因子:
--
通讯作者:
Ming Li, Defeng Guo, Tengyun Ma, Guosheng Zhang,
Ming Li, Defeng Guo, Tengyun Ma, Guosheng Zhang,
中科院分区:
其他
文献类型:
--
作者:
Ming Li, Defeng Guo, Tengyun Ma, Guosheng Zhang,

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纳米晶金属通常表现出高强度,但令人失望的是延展性和韧性低,这限制了它们的实用价值。在这里,我们报道了由纳米、亚微米和微米级颗粒组成的分级纳米结构的高断裂韧性(KIC~117 Mpa·M1/2),远远大于粗晶区的KIC~78 Mpa·M1/2。与粗晶合金相比,这种分级纳米结构的合金表现出良好的屈服强度(σS~550A)和断裂韧性的结合。我们希望这些结果将对提高纳米晶材料的断裂韧性和高性能结构材料的设计具有重要意义。
Nanocrystalline metals usually exhibit a high strength but a disappointingly low ductility and toughness, which limit their practical utility. Here, we report a high fracture toughness (KIC~117 MPa m1/2) in a hierarchical nanostructured Zr that consists of nano-, sub-micrometer- and micrometer-sized grains, which is much larger than thatKIC~78 MPa m1/2in coarse-grained Zr. This hierarchical nanostructured Zr shows a good combination of yield strength (σs~550 MPa) and fracture toughness as compared with its coarse-grained counterpart. We expect that these results will have implications in the enhancement of fracture toughness of nanocrystalline materials and in the design of high-performance structural materials.
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影响因子: 1.2
作者:
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