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Ultrafine grained Ti-based composites with ultrahigh strength and ductility achieved by equiaxing microstructure

Liu, L.H. / Yang, C. / Wang, F. / Qu, S.G. / Li, X.Q. / Zhang, W.W. / Li, Y.Y. / Zhang, L.C.

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Highlights • Ultrafine equiaxed grained composites were formed by spark plasma sintering. • The composites exhibit ultimate strength of 2585MPa and plasticity of 34.2%. • The ultrahigh strength is due to dislocation pile-up induced by precipitated phase. • The large plasticity is ascribed to slip band propagation in the matrix.

Abstract Ultrafine grained Ti-based composites with equiaxed microstructure were fabricated by sintering and crystallizing from glassy powder precursors. The optimized composites exhibit ultimate strength of 2585MPa and plasticity of exceeding 30%, occupying an unprecedented regime in the strength and ductility space of advanced titanium alloys. Dislocation pile-ups induced by precipitated phases and slip band propagation in the β-Ti matrix are the main reasons for the ultrahigh strength and plasticity respectively. The results provide an innovative route for fabricating titanium alloys with higher mechanical properties.

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Ultrafine grained Ti-based composites with ultrahigh strength and ductility achieved by equiaxing microstructure

Liu, L.H. / Yang, C. / Wang, F. / Qu, S.G. / Li, X.Q. / Zhang, W.W. / Li, Y.Y. / Zhang, L.C.

Graphical abstract Display Omitted

Highlights • Ultrafine equiaxed grained composites were formed by spark plasma sintering. • The composites exhibit ultimate strength of 2585MPa and plasticity of 34.2%. • The ultrahigh strength is due to dislocation pile-up induced by precipitated phase. • The large plasticity is ascribed to slip band propagation in the matrix.

Abstract Ultrafine grained Ti-based composites with equiaxed microstructure were fabricated by sintering and crystallizing from glassy powder precursors. The optimized composites exhibit ultimate strength of 2585MPa and plasticity of exceeding 30%, occupying an unprecedented regime in the strength and ductility space of advanced titanium alloys. Dislocation pile-ups induced by precipitated phases and slip band propagation in the β-Ti matrix are the main reasons for the ultrahigh strength and plasticity respectively. The results provide an innovative route for fabricating titanium alloys with higher mechanical properties.

Ultrafine grained Ti-based composites with ultrahigh strength and ductility achieved by equiaxing microstructure

Liu, L.H. / Yang, C. / Wang, F. / Qu, S.G. / Li, X.Q. / Zhang, W.W. / Li, Y.Y. / Zhang, L.C.

Graphical abstract Display Omitted

Highlights • Ultrafine equiaxed grained composites were formed by spark plasma sintering. • The composites exhibit ultimate strength of 2585MPa and plasticity of 34.2%. • The ultrahigh strength is due to dislocation pile-up induced by precipitated phase. • The large plasticity is ascribed to slip band propagation in the matrix.

Abstract Ultrafine grained Ti-based composites with equiaxed microstructure were fabricated by sintering and crystallizing from glassy powder precursors. The optimized composites exhibit ultimate strength of 2585MPa and plasticity of exceeding 30%, occupying an unprecedented regime in the strength and ductility space of advanced titanium alloys. Dislocation pile-ups induced by precipitated phases and slip band propagation in the β-Ti matrix are the main reasons for the ultrahigh strength and plasticity respectively. The results provide an innovative route for fabricating titanium alloys with higher mechanical properties.

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Title:

Ultrafine grained Ti-based composites with ultrahigh strength and ductility achieved by equiaxing microstructure

Contributors:

Liu, L.H. (author) / Yang, C. (author) / Wang, F. (author) / Qu, S.G. (author) / Li, X.Q. (author) / Zhang, W.W. (author) / Li, Y.Y. (author) / Zhang, L.C. (author)

Publication date:

2015-04-21

Size:

5 pages

ISSN:

DOI:

https://doi.org/10.1016/j.matdes.2015.04.032

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

Titanium alloys , Spark plasma sintering , Crystallization , Mechanical properties , Equiaxed microstructure

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