We have applied diamond anvil cell technique to study the formation of new states in metals, alloys and nanostructured materials directly during severe plastic deformations (pressure range 15 - 50 GPa, room temperature).

Well-known, that at compression of a material in diamond anvils, the sample get by not less than three steps of deformation. At small stress deformation has elastic character. Growth of pressure conducts to plastic deformation of a sample and change of its geometrical sizes. At exceeding by pressure of some limit owing to the actions of forces of friction locking a material in the field of compression, the sample appears in new area of elastic deformations which top limit is limited to durability of a material of anvils. That is at compression of a sample in diamond anvils it is exposed severe plastic deformations.

One of problems of researches at high plastic deformations is revealing the transformations proceeding in a sample, is direct during deformation. Use of techniques of diamond anvils allows fixing transformations into a material directly during deformation. As sensitive features we use thermoelectromotive force and arbitrary heat transfer.

We report results of the investigation of the beta titanium alloy Ti-15-3. For the first time it is revealed that in the beta titanium alloy Ti-15-3 there are probable irreversible structural transformations at ~ 30 and ~ 42 GPa. For the first time the possibility of studying time dynamics of structural transformations in titanium alloys at room temperatures is shown. One of the probable reasons of irreversible changes can be formation in an alloy a nanoscale structure.

This work is supported in part by CRDF BRHE under grant EK-005-X1

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