A Transforming Metal Nanocomposite with Large Elastic Strain, Low Modulus, and High Strength

Freestanding nanowires have ultrahigh elastic strain limits (4 to 7%) and yield strengths, but exploiting their intrinsic mechanical properties in bulk composites has proven to be difficult. We exploited the intrinsic mechanical properties of nanowires in a phase-transforming matrix based on the con...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2013-03, Vol.339 (6124), p.1191-1194
Main Authors: Hao, Shijie, Cui, Lishan, Jiang, Daqiang, Han, Xiaodong, Ren, Yang, Jiang, Jiang, Liu, Yinong, Liu, Zhenyang, Mao, Shengcheng, Wang, Yandong, Li, Yan, Ren, Xiaobing, Ding, Xiangdong, Wang, Shan, Yu, Cun, Shi, Xiaobin, Du, Minshu, Yang, Feng, Zheng, Yanjun, Zhang, Ze, Li, Xiaodong, Brown, Dennis E., Li, Ju
Format: Article
Language:English
Subjects:
Alloys
Bonding
Condensed matter: structure, mechanical and thermal properties
Elastic deformation
Elastic limit
Elasticity
Elasticity, elastic constants
Exact sciences and technology
Materials elasticity
Materials science
Mechanical and acoustical properties of condensed matter
Mechanical properties
Mechanical properties of nanoscale materials
Mechanical properties of solids
Metals
Moduli of elasticity
Modulus of elasticity
Nanocomposites
Nanostructure
Nanowires
Physics
Plastic deformation
Proportional limit
Strain
Tensile elasticity
Wave diffraction
Yield strength
Youngs modulus
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Summary:Freestanding nanowires have ultrahigh elastic strain limits (4 to 7%) and yield strengths, but exploiting their intrinsic mechanical properties in bulk composites has proven to be difficult. We exploited the intrinsic mechanical properties of nanowires in a phase-transforming matrix based on the concept of elastic and transformation strain matching. By engineering the microstructure and residual stress to couple the true elasticity of Nb nanowires with the pseudoelasticity of a NiTi shape-memory alloy, we developed an in situ composite that possesses a large quasi-linear elastic strain of over 6%, a low Young's modulus of ∼28 gigapascals, and a high yield strength of ∼1.65 gigapascals. Our elastic strain-matching approach allows the exceptional mechanical properties of nanowires to be exploited in bulk materials.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1228602