Segregation mediated heterogeneous structure in a metastable β titanium alloy with a superior combination of strength and ductility

Scientific Reports
Junheng GaoW Mark Rainforth

Abstract

In β titanium alloys, the β stabilizers segregate easily and considerable effort has been devoted to alleviate/eliminate the segregation. In this work, instead of addressing the segregation problems, the segregation was utilized to develop a novel microstructure consisting of a nanometre-grained duplex (α+β) structure and micrometre scale β phase with superior mechanical properties. An as-cast Ti-9Mo-6W alloy exhibited segregation of Mo and W at the tens of micrometre scale. This was subjected to cold rolling and flash annealing at 820 oC for 2 and 5 mins. The solidification segregation of Mo and W leads to a locally different microstructure after cold rolling (i.e., nanostructured β phase in the regions rich in Mo and W and plate-like martensite and β phase in regions relatively poor in Mo and W), which play a decisive role in the formation of the heterogeneous microstructure. Tensile tests showed that this alloy exhibited a superior combination of high yield strength (692 MPa), high tensile strength (1115 MPa), high work hardening rate and large uniform elongation (33.5%). More importantly, the new technique proposed in this work could be potentially applicable to other alloy systems with segregation problems.

References

Nov 1, 2002·Nature·Yinmin WangEn Ma
Jan 22, 2010·Nature·Qian YuEvan Ma
Oct 8, 2013·Materials Science & Engineering. C, Materials for Biological Applications·Zhengjie LinDi Zhang
Apr 2, 2016·Nature Communications·Arun DevarajCurt Lavender
Jul 12, 2016·Acta Biomaterialia·Xueyuan Yang, Christopher R Hutchinson

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Methods Mentioned

BETA
electron diffraction
scanning electron microscopy
Transmission electron microscopy
transmission
X-ray

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