Core-shell structured titanium-nitrogen alloys with high strength, high thermal stability and good plasticity

Y. S. Zhang; Y. H. Zhao; W. Zhang; J. W. Lu; J. J. Hu; W. T. Huo; P. X. Zhang

doi:10.1038/srep40039

Core-shell structured titanium-nitrogen alloys with high strength, high thermal stability and good plasticity

Y. S. Zhang, Y. H. Zhao, W. Zhang, J. W. Lu, J. J. Hu, W. T. Huo, P. X. Zhang

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

Multifunctional materials with more than two good properties are widely required in modern industries. However, some properties are often trade-off with each other by single microstructural designation. For example, nanostructured materials have high strength, but low ductility and thermal stability. Here by means of spark plasma sintering (SPS) of nitrided Ti particles, we synthesized bulk core-shell structured Ti alloys with isolated soft coarse-grained Ti cores and hard Ti-N solid solution shells. The core-shell Ti alloys exhibit a high yield strength (∼1.4 GPa) comparable to that of nanostructured states and high thermal stability (over 1100 °C, 0.71 of melting temperature), contributed by the hard Ti-N shells, as well as a good plasticity (fracture plasticity of 12%) due to the soft Ti cores. Our results demonstrate that this core-shell structure offers a design pathway towards an advanced material with enhancing strength-plasticity-thermal stability synergy.

Original language	English
Article number	40039
Journal	Scientific Reports
Volume	7
DOIs	https://doi.org/10.1038/srep40039
State	Published - 6 Jan 2017
Externally published	Yes

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title = "Core-shell structured titanium-nitrogen alloys with high strength, high thermal stability and good plasticity",

abstract = "Multifunctional materials with more than two good properties are widely required in modern industries. However, some properties are often trade-off with each other by single microstructural designation. For example, nanostructured materials have high strength, but low ductility and thermal stability. Here by means of spark plasma sintering (SPS) of nitrided Ti particles, we synthesized bulk core-shell structured Ti alloys with isolated soft coarse-grained Ti cores and hard Ti-N solid solution shells. The core-shell Ti alloys exhibit a high yield strength (∼1.4 GPa) comparable to that of nanostructured states and high thermal stability (over 1100 °C, 0.71 of melting temperature), contributed by the hard Ti-N shells, as well as a good plasticity (fracture plasticity of 12%) due to the soft Ti cores. Our results demonstrate that this core-shell structure offers a design pathway towards an advanced material with enhancing strength-plasticity-thermal stability synergy.",

author = "Zhang, {Y. S.} and Zhao, {Y. H.} and W. Zhang and Lu, {J. W.} and Hu, {J. J.} and Huo, {W. T.} and Zhang, {P. X.}",

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AU - Zhang, Y. S.

AU - Zhao, Y. H.

AU - Zhang, W.

AU - Lu, J. W.

AU - Hu, J. J.

AU - Huo, W. T.

AU - Zhang, P. X.

PY - 2017/1/6

Y1 - 2017/1/6

N2 - Multifunctional materials with more than two good properties are widely required in modern industries. However, some properties are often trade-off with each other by single microstructural designation. For example, nanostructured materials have high strength, but low ductility and thermal stability. Here by means of spark plasma sintering (SPS) of nitrided Ti particles, we synthesized bulk core-shell structured Ti alloys with isolated soft coarse-grained Ti cores and hard Ti-N solid solution shells. The core-shell Ti alloys exhibit a high yield strength (∼1.4 GPa) comparable to that of nanostructured states and high thermal stability (over 1100 °C, 0.71 of melting temperature), contributed by the hard Ti-N shells, as well as a good plasticity (fracture plasticity of 12%) due to the soft Ti cores. Our results demonstrate that this core-shell structure offers a design pathway towards an advanced material with enhancing strength-plasticity-thermal stability synergy.

AB - Multifunctional materials with more than two good properties are widely required in modern industries. However, some properties are often trade-off with each other by single microstructural designation. For example, nanostructured materials have high strength, but low ductility and thermal stability. Here by means of spark plasma sintering (SPS) of nitrided Ti particles, we synthesized bulk core-shell structured Ti alloys with isolated soft coarse-grained Ti cores and hard Ti-N solid solution shells. The core-shell Ti alloys exhibit a high yield strength (∼1.4 GPa) comparable to that of nanostructured states and high thermal stability (over 1100 °C, 0.71 of melting temperature), contributed by the hard Ti-N shells, as well as a good plasticity (fracture plasticity of 12%) due to the soft Ti cores. Our results demonstrate that this core-shell structure offers a design pathway towards an advanced material with enhancing strength-plasticity-thermal stability synergy.

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Core-shell structured titanium-nitrogen alloys with high strength, high thermal stability and good plasticity

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