A nano lamella NbTi-NiTi composite with high Strength
A nano lamella NbTi-NiTi composite with high Strength
复制标题
高强度纳米片NbTi-NiTi复合材料
DOI：
10.1016/j.msea.2015.03.010
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Lishan Cui
中科院分区：
文献类型：
--
作者：
Jiang Jiang;Daqiang Jiang;Shijie Hao;Cun Yu;Junsong Zhang;Yang Ren;Deping Lu;Shifang Xie;Lishan Cui
采用真空感应熔炼法制备了Nb 60 Ti 24 Ni 16（at%）过共晶合金，并将该合金铸锭经热锻和拉丝得到了纳米层状NbTi-NiTi复合材料。微观分析表明，NbTi和NiTi纳米片层在复合材料中交替分布，沿丝轴向沿着，NbTi纳米片层的体积分数较高（约70%）。原位同步辐射X射线衍射分析表明，加载时发生了应力诱发马氏体相变，有效地削弱了界面处的应力集中，避免了缺陷进入纳米增强相。然后，嵌入NbTi纳米薄片表现出高达2.72%的高弹性应变，1.5倍的Nb纳米线嵌入在一个传统的塑料基体，和相应的应力进行评估为2.53 GPa。高体积分数的NbTi纳米薄片改善了高强度从纳米增强相转化为复合材料的体相性质，具有约1.7 GPa的平台应力和约1.9 GPa的断裂强度。
A hypereutectic Nb60Ti24Ni16(at%) alloy was prepared by vacuum induction melting, and a nano lamellae NbTi–NiTi composite was obtained by hot-forging and wire-drawing of the ingot. Microscopic analysis showed that NbTi and NiTi nano lamellae distributed alternatively in the composite, and aligned along the wire axial direction, with a high volume fraction (~70%) of NbTi nano lamellae. In situ synchrotron X-ray diffraction analysis revealed that stress induced martensitic transformation occurred upon loading, which would effectively weaken the stress concentration at the interface and avoid the introduction of defects into the nano reinforced phase. Then the embedded NbTi nano lamellae exhibited a high elastic strain up to 2.72%, 1.5 times as high as that of the Nb nanowires embedded in a conventional plastic matrix, and the corresponding stress carried by NbTi was evaluated as 2.53 GPa. The high volume fraction of NbTi nano lamellae improved the translation of high strength from the nano reinforced phase into bulk properties of the composite, with a platform stress of ~1.7 GPa and a fracture strength of ~1.9 GPa.