State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China.
State Key Laboratory for Mechanical Behavior of Materials and Frontier Institute of Science and Technology, Xi'an Jiaotong University , Xi'an 710049, China.
ACS Appl Mater Interfaces. 2016 Feb 10;8(5):2917-22. doi: 10.1021/acsami.5b10840. Epub 2016 Feb 2.
Individual metallic nanowires can sustain ultralarge elastic strains of 4-7%. However, achieving and retaining elastic strains of such magnitude in kilogram-scale nanowires are challenging. Here, we find that under active load, ∼ 5.6% elastic strain can be achieved in Nb nanowires embedded in a metallic matrix deforming by detwinning. Moreover, large tensile (2.8%) and compressive (-2.4%) elastic strains can be retained in kilogram-scale Nb nanowires when the external load was fully removed, and adjustable in magnitude by processing control. It is then demonstrated that the retained tensile elastic strains of Nb nanowires can increase their superconducting transition temperature and critical magnetic field, in comparison with the unstrained original material. This study opens new avenues for retaining large and tunable elastic strains in great quantities of nanowires and elastic-strain-engineering at industrial scale.
单个金属纳米线可以承受 4-7%的超大弹性应变。然而，在公斤级纳米线中实现并保持如此大的弹性应变是具有挑战性的。在这里，我们发现，在主动负载下，嵌入在通过去孪晶变形的金属基质中的 Nb 纳米线可以实现约 5.6%的弹性应变。此外，当完全去除外部负载时，公斤级 Nb 纳米线可以保留大的拉伸（2.8%）和压缩（-2.4%）弹性应变，并且可以通过加工控制来调整应变的大小。然后证明，与未受应变的原始材料相比，Nb 纳米线的保留拉伸弹性应变可以提高其超导转变温度和临界磁场。这项研究为在大量纳米线中保留大的和可调的弹性应变以及在工业规模上进行弹性应变工程开辟了新的途径。
