A nano lamella NbTi-NiTi composite with high strength

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:633

Article

Jiang, Jiang^1,2,3,4  Jiang, Daqiang^3,4,5  Hao, Shijie^3,4  Yu, Cun^3,4  Zhang, Junsong^3,4  Ren, Yang⁶  Lu, Deping^1,2  Xie, Shifang^1,2  Cui, Lishan^3,4 

[1] Jiangxi Acad Sci, Jiangxi Key Lab Adv Copper & Tungsten Mat, Nanchang 330029, Peoples R China

[2] Jiangxi Acad Sci, Inst Appl Phys, Nanchang 330029, Peoples R China

[3] China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China

[4] China Univ Petr, Dept Mat Sci & Engn, Beijing 102249, Peoples R China

[5] Univ Western Australia, Sch Mech & Chem Engn, Nedlands, WA 6009, Australia

[6] Argonne Natl Lab, Xray Sci Div, Argonne, IL 60439 USA

关键词: Nano lamellae composite;    Martensitic transformation;    Shape memory alloy (SMA);    NiTi;    In situ synchrotron X-ray diffraction;   

DOI  :  10.1016/j.msea.2015.03.010

来源: Elsevier

【 摘 要 】

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 (similar to 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 similar to 1.7 GPa and a fracture strength of similar to 1.9 GPa. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free