Rev.Adv.Mater.Sci. (RAMS)
No 2, Vol. 25, 2010, pages 142-147

SOLID-PHASE JOINT FORMATION IN Ti-6Al-4V ALLOY UNDER CONDITIONS
OF LOW TEMPERATURE SUPERPLASTICITY

R.Ya. Lutfullin and M.Kh. Mukhametrakhimov

Abstract

The actual problem of modern aeronautical engineering is an urgent necessity in decreasing (by 150 C and more) temperature of solid-phase welding for producing articles out of titanium alloys.

The experiments on solid-phase joining of bulk nanostructured semi-finished products out of Ti-6Al-4V alloy performed under conditions of low temperature superplasticity allowed establishing that the process of joining is of a deformation origin mainly. It has been established that under conditions of low temperature superplasticity (SP) the quality of a solid-phase joint of bulk nanostructured Ti-6Al-4V alloy parts depends on a strain value, and the strain required for processing a joint with strength and plasticity values of a basis material increases with decreasing temperature. The obtained result testifies a governing role of deformation and can be basic for developing a model of solid-phase joining under conditions of low temperature superplasticity.

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