Elevated tensile properties of Ti-O alloy with a novel core-shell structure

Abstract

Oxidized Ti powder was consolidated successfully by using spark plasma sintering into a fully dense bulk core-shell (CS) structured Ti alloy with isolated soft coarse-grained Ti cores and hard Ti-O solid solution shells. The temperature effect on the mechanical responses of CS Ti was assessed experimentally through tensile testing during 500–700 °C at a constant strain rate of 0.0005 s−1 and compared with those for its annealed counterpart and a pure Ti compact. All samples exhibit a decreased strength with the temperature. CS Ti exhibits a significantly enhanced tensile strength at all the testing temperatures compared with CP Ti. Contrary to the substantial brittleness of the annealed sample at 500 °C and 600 °C, CS Ti presents a much enhanced ductility at elevated temperatures, being 12% at 500 °C and 77% at 600 °C. At 700 °C, all the samples show comparable elongation. The superior mechanical performances of CS Ti at elevated temperatures can be attributed to its novel heterogeneous microstructure along with high O content.

RAS ID

24010

Document Type

Journal Article

Date of Publication

2017

Location of the Work

Netherlands

School

School of Engineering

Copyright

subscription content

Publisher

Elsevier BV

Comments

Zhang, Y. S., Wang, X., Zhang, W., Huo, W. T., Hu, J. J., & Zhang, L. C. (2017). Elevated tensile properties of Ti-O alloy with a novel core-shell structure. Materials Science and Engineering: A, 696, 360-365. https://doi.org/10.1016/j.msea.2017.04.088

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Link to publisher version (DOI)

10.1016/j.msea.2017.04.088