Achieving ultra-high bearing strength of tungsten nanoribbons in a transforming metal matrix
Achieving ultra-high bearing strength of tungsten nanoribbons in a transforming metal matrix
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DOI：
10.1016/j.jallcom.2018.11.363
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发表时间：
2019-04
影响因子：
6.2
通讯作者：
F. Guo;S. Hao;Xiaohua Jiang;D. Jiang;L. Cui;Yang Ren
中科院分区：
文献类型：
--
作者：
F. Guo;S. Hao;Xiaohua Jiang;D. Jiang;L. Cui;Yang Ren
纳米线（或纳米带）因其超高强度而被认为是复合材料最有潜力的结构增强材料，但很难将其超高强度转化为复合材料。本文通过机械还原W-NiTi锭制备了原位W纳米带-NiTi基复合材料，并通过原位高能X射线衍射研究了拉伸加载-卸载过程中的微机械变形行为。结果表明，NiTi 基体中 W 纳米带的大弹性变形是由基体的马氏体转变决定的，并与该转变同步。该复合材料中W纳米带的承载强度高达11.6GPa。载荷从基体到纳米带发生了显着的转移，表现出局部性和快速性的特点。体积分数为3%的W纳米带所承载的应力分数对于复合材料的强度而言高达45%。
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, anin-situW nanoribbbons-NiTi matrix composite was fabricated by mechanical reduction of a W-NiTi ingot, and the micromechanical deformation behavior was studied byin-situhigh 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.