Achieving ultra-high bearing strength of tungsten nanoribbons in a transforming metal matrix

JOURNAL OF ALLOYS AND COMPOUNDS

卷:781

Article

Guo, Fangmin¹  Hao, Shijie¹  Jiang, Xiaohua^1,2  Jiang, Daqiang¹  Cui, Lishan^1,2  Ren, Yang³ 

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

[2] China Univ Petr, Beijing Key Lab Failure Corros & Protect Oil Gas, Beijing 102249, Peoples R China

[3] Argonne Natl Lab, Xray Sci Div, 9700 S Cass Ave, Argonne, IL 60439 USA

关键词: Tungsten nanoribbons;    Shape memory alloy;    High energy X-ray diffraction;    Martensitic transformation;    Bearing strength;   

DOI  :  10.1016/j.jallcom.2018.11.363

来源: Elsevier

【 摘 要 】

Nanowires (or nanoribbons) were identified as the most potential structural reinforcements for composites due to their ultrahigh strength, but it is difficult to transcribe their ultrahigh strength into the composite. Here, an in-situ W nanoribbbons-NiTi matrix composite was fabricated by mechanical reduction of a W-NiTi ingot, and the micromechanical deformation behavior was studied by in-situ high energy X-ray diffraction during tensile loading-unloading. It is revealed that the large elastic deformation of the W nanoribbons in a NiTi matrix is dictated by and synchronized with the martensitic transformation of the matrix. The bearing strength of the W nanoribbons, up to 11.6 GPa, was achieved in this composite. A significant load transfer took place from the matrix to the nanoribbons, exhibiting the characters of locality and rapidity. The stress fraction carried by the W nanoribbons with the volume fraction of 3% is up to 45% for the strength of the composite. (C) 2018 Elsevier B.V. All rights reserved.

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