The ultrahigh mechanical energy-absorption capability evidenced in a high-strength NbTi/NiTi nanocomposite
The ultrahigh mechanical energy-absorption capability evidenced in a high-strength NbTi/NiTi nanocomposite
复制标题
高强度 NbTi/NiTi 纳米复合材料具有超高机械能吸收能力
DOI：
10.1063/1.3610562
复制
发表时间：
2011-07-11
影响因子：
4
通讯作者：
Ren, Y.
中科院分区：
文献类型：
--
作者：
Hao, S. J.;Cui, L. S.;Ren, Y.
制备了NbTi纳米线均匀嵌入NiTi基体的纳米复合材料，该材料具有良好的机械阻尼性能。在8%应变下测得的吸收能量高达54 MJ/m3，这是已知的Ni-Ti合金中所发现的吸收能量（约16 MJ/m3）的三倍多。原位同步辐射X-射线衍射表明，纳米线和矩阵之间的应力的重新分配证明从残余晶格应变的突然变化。该纳米线的机械阻尼特性归因于纳米线和基体之间的强相互作用以及NbTi纳米线在变形过程中发生的塑性变形，从而导致大的能量耗散。
A nanocomposite composed of NbTi nanowires uniformly embedded in NiTi matrices was fabricated, which exhibits an ultrahigh mechanical-damping capability. The absorption energy measured under an applied 8% strain is up to 54 MJ/m3, which is over three times higher than that (∼16 MJ/m3) found in the well-known Ni-Ti alloys. In-situ synchrotron x-ray diffraction reveals that a redistribution of stress between the nanowires and matrices was evidenced from an abrupt change in residual lattice strains. The ultrahigh mechanical-damping property is attributed to a combination of the strong interaction of nanowires and matrices and the plastic deformation occurring in NbTi nanowires during deformation causing large energy dissipation.