Abnormal precipitation behaviour of α″-martensite from α-phase under tension–torsion deformation

ABSTRACT

The tension–torsion properties and deformation microstructure of near β titanium alloy after various heat treatment have been investigated by transmission electron microscopy (TEM). The samples after aging treatment at 500°C for 8 h possesses obviously higher strength than those samples undergoing other different treatment on account of thin α” plates distributing uniformly in the β grains. Interestingly, precipitation of α″-martensite in α plates were observed for the first time under tension–torsion deformation. The abnormal precipitation behaviour was attributed mainly to the large tensile-shear stress.

KEYWORDS:

• Tension–torsion properties
• ageing
• martensites
• titanium alloys

Acknowledgements

This work was financially supported by National Natural Science Foundation of China (52071219, 51501117).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by National Natural Science Foundation of China: [Grant Numbers 52071219, 51501117].