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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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Zhang YS,Zhao YH,Zhang W,Lu JW,Hu JJ,Huo WT,Zhang PX

doi

10.1038/srep40039

subject

Has Abstract

pub_date

2017-01-06 00:00:00

pages

40039

issn

2045-2322

pii

srep40039

journal_volume

7

pub_type

杂志文章

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