Load transfer in phase transforming matrix-nanowire composite revealing the significant load carrying capacity of the nanowires
Load transfer in phase transforming matrix-nanowire composite revealing the significant load carrying capacity of the nanowires
复制标题
相变基质-纳米线复合材料中的载荷传递揭示了纳米线的显着承载能力
DOI：
10.1016/j.matdes.2015.10.029
复制
发表时间：
2016
影响因子：
8.4
通讯作者：
Cui Lishan
中科院分区：
文献类型：
--
作者：
Yu Cun;Liu Zhenyang;Liu Yinong;Shao Yang;Ren Yang;Cui Lishan
本文报道了一种原位复合的NiTi基体和定向Nb纳米线的研究。复合材料的设计策略是进一步探索纳米线增强体在复合材料中的承载能力。该复合系统提供了两个组件之间的负载分担的独特条件，其中NiTi基质通过应力诱导马氏体相变（SIMT）经由离散（不连续）、瞬时和固有晶格畸变而变形，并且Nb纳米线经由弹性变形而变形。本研究借由同步辐射绕射原位分析探讨铌奈米线与镍钛基体间的负载分担机制。结果表明，当NiTi基体发生应力诱发B2-B19′马氏体相变时，载荷从基体传递到纳米线，纳米线发生较大的弹性变形.嵌入的Nb纳米线，具有25%的体积分数，被揭示能够承载在最大70%的施加的负载在完成SIMT的NiTi基体，并能够承载超过55%的施加的负载在终端的变形。
This paper reports a study of an in-situ composite of NiTi matrix and aligned Nb nanowires. The design strategy of the composite was to further explore the load carrying capacity of the nanowire reinforcements in composite. This composite system offered a unique condition of load sharing between the two components in which the NiTi matrix deforms via discrete (discontinuous), instantaneous and intrinsic lattice distortion through stress-induced martensitic transformation (SIMT) and the Nb nanowires deform via elastic deformation. This study investigated the mechanism of load sharing between the embedded Nb nanowires and the NiTi matrix by means of in-situ synchrotron diffraction analysis. It was found that significant load transfer from the matrix to the nanowires occurred when the NiTi matrix underwent stress-induced B2–B19′ martensitic transformation and the nanowires deformed largely by elastic deformation. The embedded Nb nanowires, with a volume fraction of 25%, were revealed capable of carrying at maximally 70% of the applied load at the completion of SIMT of NiTi matrix, and were capable of carrying more than 55% of the applied load at the terminal of deformation.