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Achieving large linear elasticity and high strength in bulk nanocompsite via synergistic effect.

Hao S, Cui L, Guo F, Liu Y, Shi X, Jiang D, Brown DE, Ren Y - Sci Rep (2015)

Bottom Line: Developing bulk metallic materials showing large linear elasticity and high strength has proven to be difficult.It is demonstrated that the synergistic effect allows the exceptional mechanical properties of nanowires to be harvested at macro scale and the mechanical properties of matrix to be greatly improved, resulting in these superior properties.This study provides new avenues for developing advanced composites with superior properties by using effective synergistic effect between components.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China.

ABSTRACT
Elastic strain in bulk metallic materials is usually limited to only a fraction of 1%. Developing bulk metallic materials showing large linear elasticity and high strength has proven to be difficult. Here, based on the synergistic effect between nanowires and orientated martensite NiTi shape memory alloy, we developed an in-situ Nb nanowires -orientated martensitic NiTi matrix composite showing an ultra-large linear elastic strain of 4% and an ultrahigh yield strength of 1.8 GPa. This material also has a high mechanical energy storage efficiency of 96% and a high energy storage density of 36 J/cm(3) that is almost one order of larger than that of spring steel. It is demonstrated that the synergistic effect allows the exceptional mechanical properties of nanowires to be harvested at macro scale and the mechanical properties of matrix to be greatly improved, resulting in these superior properties. This study provides new avenues for developing advanced composites with superior properties by using effective synergistic effect between components.

No MeSH data available.


Related in: MedlinePlus

In situ synchrotron X-ray diffraction analysis of the NiTi-Nb composite and the binary NiTi alloy (with oriented martensite).(a), Evolution of in situ synchrotron X-ray diffraction patterns of the NiTi-Nb composite during a tensile deformation cycle to 4% macroscopic strain. (b), The d-spacing strain with respect to applied macroscopic strain for the B19′-NiTi (001) planes perpendicular to the loading direction in the NiTi matrix of the NiTi-Nb composite (the red curve) and in the binary NiTi alloy (the blue curve). (c), The calculated twinning-detwinning strains versus the applied macroscopic strain (the red curve for the NiTi matrix in the NiTi-Nb composite; the blue curve for the binary NiTi alloy). (d), The d-spacing strain with respect to applied macroscopic strain for the Nb (110) planes perpendicular to the loading direction in the NiTi-Nb composite. (e), Comparison of the elastic strain limits of the Nb nanowires embedded in oriented martensitic NiTi matrixand embedded in the conventional metal matrix deforming by dislocation slip23282930.
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f4: In situ synchrotron X-ray diffraction analysis of the NiTi-Nb composite and the binary NiTi alloy (with oriented martensite).(a), Evolution of in situ synchrotron X-ray diffraction patterns of the NiTi-Nb composite during a tensile deformation cycle to 4% macroscopic strain. (b), The d-spacing strain with respect to applied macroscopic strain for the B19′-NiTi (001) planes perpendicular to the loading direction in the NiTi matrix of the NiTi-Nb composite (the red curve) and in the binary NiTi alloy (the blue curve). (c), The calculated twinning-detwinning strains versus the applied macroscopic strain (the red curve for the NiTi matrix in the NiTi-Nb composite; the blue curve for the binary NiTi alloy). (d), The d-spacing strain with respect to applied macroscopic strain for the Nb (110) planes perpendicular to the loading direction in the NiTi-Nb composite. (e), Comparison of the elastic strain limits of the Nb nanowires embedded in oriented martensitic NiTi matrixand embedded in the conventional metal matrix deforming by dislocation slip23282930.

Mentions: To reveal the mechanism of such superior mechanical properties of the composite, in situ synchrotron X-ray diffraction was carried out on the NiTi-Nb composite, and a binary NiTi alloy (with oriented martensite) for comparison, during tensile deformation cycle. Figure 4a shows the in situ synchrotron X-ray diffraction patterns of the composite obtained over a tensile deformation cycle up to 4% of strain. The d-spacing strain of the B19′ martensite in the loading direction, as determined from the B19′-NiTi (001) planes perpendicular to the loading direction, is plotted in Figure 4b as a function of the applied macroscopic strain (the red curve). It can be seen that the oriented martensitic NiTi matrix underwent a large tensile elastic strain of 2.6%. For comparison, the d-spacing strain of the B19′-NiTi (001) planes in the binary NiTi alloy (with oriented martensite) is also plotted in Figure 4b (the blue curve). It is seen that the binary NiTi alloy exhibited a tensile elastic strain of 1.3%, which is substantially smaller than that (2.6%) of the NiTi matrix in the NiTi-Nb composite. It is believed that the existence of large quantities of Nb nanowires can effectively refine grain sizes of matrix and introducelarge amounts of nanowire/matrix interfaces, which suppress the plastic deformation of the matrix and enhance the elastic deformation of the matrix.


Achieving large linear elasticity and high strength in bulk nanocompsite via synergistic effect.

Hao S, Cui L, Guo F, Liu Y, Shi X, Jiang D, Brown DE, Ren Y - Sci Rep (2015)

In situ synchrotron X-ray diffraction analysis of the NiTi-Nb composite and the binary NiTi alloy (with oriented martensite).(a), Evolution of in situ synchrotron X-ray diffraction patterns of the NiTi-Nb composite during a tensile deformation cycle to 4% macroscopic strain. (b), The d-spacing strain with respect to applied macroscopic strain for the B19′-NiTi (001) planes perpendicular to the loading direction in the NiTi matrix of the NiTi-Nb composite (the red curve) and in the binary NiTi alloy (the blue curve). (c), The calculated twinning-detwinning strains versus the applied macroscopic strain (the red curve for the NiTi matrix in the NiTi-Nb composite; the blue curve for the binary NiTi alloy). (d), The d-spacing strain with respect to applied macroscopic strain for the Nb (110) planes perpendicular to the loading direction in the NiTi-Nb composite. (e), Comparison of the elastic strain limits of the Nb nanowires embedded in oriented martensitic NiTi matrixand embedded in the conventional metal matrix deforming by dislocation slip23282930.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4352871&req=5

f4: In situ synchrotron X-ray diffraction analysis of the NiTi-Nb composite and the binary NiTi alloy (with oriented martensite).(a), Evolution of in situ synchrotron X-ray diffraction patterns of the NiTi-Nb composite during a tensile deformation cycle to 4% macroscopic strain. (b), The d-spacing strain with respect to applied macroscopic strain for the B19′-NiTi (001) planes perpendicular to the loading direction in the NiTi matrix of the NiTi-Nb composite (the red curve) and in the binary NiTi alloy (the blue curve). (c), The calculated twinning-detwinning strains versus the applied macroscopic strain (the red curve for the NiTi matrix in the NiTi-Nb composite; the blue curve for the binary NiTi alloy). (d), The d-spacing strain with respect to applied macroscopic strain for the Nb (110) planes perpendicular to the loading direction in the NiTi-Nb composite. (e), Comparison of the elastic strain limits of the Nb nanowires embedded in oriented martensitic NiTi matrixand embedded in the conventional metal matrix deforming by dislocation slip23282930.
Mentions: To reveal the mechanism of such superior mechanical properties of the composite, in situ synchrotron X-ray diffraction was carried out on the NiTi-Nb composite, and a binary NiTi alloy (with oriented martensite) for comparison, during tensile deformation cycle. Figure 4a shows the in situ synchrotron X-ray diffraction patterns of the composite obtained over a tensile deformation cycle up to 4% of strain. The d-spacing strain of the B19′ martensite in the loading direction, as determined from the B19′-NiTi (001) planes perpendicular to the loading direction, is plotted in Figure 4b as a function of the applied macroscopic strain (the red curve). It can be seen that the oriented martensitic NiTi matrix underwent a large tensile elastic strain of 2.6%. For comparison, the d-spacing strain of the B19′-NiTi (001) planes in the binary NiTi alloy (with oriented martensite) is also plotted in Figure 4b (the blue curve). It is seen that the binary NiTi alloy exhibited a tensile elastic strain of 1.3%, which is substantially smaller than that (2.6%) of the NiTi matrix in the NiTi-Nb composite. It is believed that the existence of large quantities of Nb nanowires can effectively refine grain sizes of matrix and introducelarge amounts of nanowire/matrix interfaces, which suppress the plastic deformation of the matrix and enhance the elastic deformation of the matrix.

Bottom Line: Developing bulk metallic materials showing large linear elasticity and high strength has proven to be difficult.It is demonstrated that the synergistic effect allows the exceptional mechanical properties of nanowires to be harvested at macro scale and the mechanical properties of matrix to be greatly improved, resulting in these superior properties.This study provides new avenues for developing advanced composites with superior properties by using effective synergistic effect between components.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China.

ABSTRACT
Elastic strain in bulk metallic materials is usually limited to only a fraction of 1%. Developing bulk metallic materials showing large linear elasticity and high strength has proven to be difficult. Here, based on the synergistic effect between nanowires and orientated martensite NiTi shape memory alloy, we developed an in-situ Nb nanowires -orientated martensitic NiTi matrix composite showing an ultra-large linear elastic strain of 4% and an ultrahigh yield strength of 1.8 GPa. This material also has a high mechanical energy storage efficiency of 96% and a high energy storage density of 36 J/cm(3) that is almost one order of larger than that of spring steel. It is demonstrated that the synergistic effect allows the exceptional mechanical properties of nanowires to be harvested at macro scale and the mechanical properties of matrix to be greatly improved, resulting in these superior properties. This study provides new avenues for developing advanced composites with superior properties by using effective synergistic effect between components.

No MeSH data available.


Related in: MedlinePlus