Ultrahigh strength and ductility in newly developed materials with coherent nanolamellar architectures.
Ultrahigh strength and ductility in newly developed materials with coherent nanolamellar architectures.
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DOI：
10.1038/s41467-020-20109-z
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发表时间：
2020-12-07
影响因子：
16.6
通讯作者：
Liu CT
中科院分区：
文献类型：
--
作者：
Fan L;Yang T;Zhao Y;Luan J;Zhou G;Wang H;Jiao Z;Liu CT
纳米层状材料具有很强的抗弯强度和特殊的物理性能，在结构应用中具有重要的技术意义。然而，这些材料通常具有低拉伸延展性，这严重限制了它们的实际应用。在这里，我们表明，显着增强的拉伸延展性可以实现在连贯的纳米层状合金，表现出前所未有的组合超过2 GPa的屈服强度和16%的均匀拉伸延展性。抗弯强度主要来源于片层边界强化，而大的延展性与由独特的纳米片层结构调节的渐进加工硬化机制相关。共格片层边界有利于位错的传递，消除了边界处的应力集中。同时，变形引起的分层堆垛层错网络和相关的高密度Lomer-Cottrell锁增强加工硬化响应，导致异常大的拉伸延性。连贯的纳米层状策略可以潜在地应用于许多其他合金，并为设计用于技术应用的超强但延展性材料开辟新的途径。纳米层状材料的抗拉强度是非常可取的技术应用。在这里，作者报告了一种纳米层结构的方法，利用连贯的L12结构，以实现Ni-Fe-Co-Cr-Al-Ti多元合金的抗弯强度和延展性。
Nano-lamellar materials with ultrahigh strengths and unusual physical properties are of technological importance for structural applications. However, these materials generally suffer from low tensile ductility, which severely limits their practical utility. Here we show that markedly enhanced tensile ductility can be achieved in coherent nano-lamellar alloys, which exhibit an unprecedented combination of over 2 GPa yield strength and 16% uniform tensile ductility. The ultrahigh strength originates mainly from the lamellar boundary strengthening, whereas the large ductility correlates to a progressive work-hardening mechanism regulated by the unique nano-lamellar architecture. The coherent lamellar boundaries facilitate the dislocation transmission, which eliminates the stress concentrations at the boundaries. Meanwhile, deformation-induced hierarchical stacking-fault networks and associated high-density Lomer-Cottrell locks enhance the work hardening response, leading to unusually large tensile ductilities. The coherent nano-lamellar strategy can potentially be applied to many other alloys and open new avenues for designing ultrastrong yet ductile materials for technological applications. Nano-lamellar materials with ultrahigh strengths are highly desirable for technological applications. Here the authors report a nanolamellar architecturing approach by utilizing coherent L12 structures to achieve ultrahigh strength and ductility in Ni-Fe-Co-Cr-Al-Ti multicomponent alloys.
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影响因子：
5
作者：
Koch, CC;Morris, DG;Inoue, A
通讯作者：
Inoue, A
影响因子：
3.7
作者：
Kresse, G;Furthmuller, J
通讯作者：
Furthmuller, J
DOI：
10.1016/0965-9773(95)00025-9
发表时间：
1995-01-01
期刊：
NANOSTRUCTURED MATERIALS
影响因子：
--
作者：
Gleiter, H
通讯作者：
Gleiter, H
影响因子：
1.2
作者：
García-Mateo, C;Caballero, FG
通讯作者：
Caballero, FG
影响因子：
64.8
作者：
Li, Zhiming;Pradeep, Konda Gokuldoss;Tasan, Cemal Cem
通讯作者：
Tasan, Cemal Cem