Manipulating the interfacial structure of nanomaterials to achieve a unique combination of strength and ductility.
Manipulating the interfacial structure of nanomaterials to achieve a unique combination of strength and ductility.
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DOI：
10.1038/ncomms10802
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发表时间：
2016-02-18
影响因子：
16.6
通讯作者：
Rupert TJ
中科院分区：
文献类型：
--
作者：
Khalajhedayati A;Pan Z;Rupert TJ
工程纳米材料的界面控制与自然材料相比取得了有限的成功，在自然材料中经常发现具有不同界面状态的分级结构，这种界面控制可以减轻工程纳米材料的常见局限性。例如，纳米结构的金属具有极高的强度，但这种优势是以牺牲其他重要性能为代价的，如延展性。在这里，我们报告了一种将纳米结构与能够调整界面结构的最新进展相结合的技术，这是一种互补材料设计策略，可以实现前所未有的性能组合。铜基合金的晶粒尺寸在纳米范围内和独特的晶界结构特征的创建，使用偏析掺杂剂和加工路线，有利于非晶间膜的形成。这些合金的机械性能表明，在这里成功地避免了通常在金属材料中观察到的强度和延展性之间的权衡。 纳米晶体金属通常表现出高强度，但具有差的延展性。在这里，作者采用晶界工程，以克服这个问题，通过引入非晶间膜，使上级机械性能的铜锆合金。
The control of interfaces in engineered nanostructured materials has met limited success compared with that which has evolved in natural materials, where hierarchical structures with distinct interfacial states are often found. Such interface control could mitigate common limitations of engineering nanomaterials. For example, nanostructured metals exhibit extremely high strength, but this benefit comes at the expense of other important properties like ductility. Here, we report a technique for combining nanostructuring with recent advances capable of tuning interface structure, a complementary materials design strategy that allows for unprecedented property combinations. Copper-based alloys with both grain sizes in the nanometre range and distinct grain boundary structural features are created, using segregating dopants and a processing route that favours the formation of amorphous intergranular films. The mechanical behaviour of these alloys shows that the trade-off between strength and ductility typically observed for metallic materials is successfully avoided here. Nanocrystalline metals often exhibit high strength yet suffer from poor ductility. Here, the authors employ grain boundary engineering to overcome this problem by introducing amorphous intergranular films, which enables superior mechanical properties in copper-zirconium alloys.