Ultrahigh-density twin titanium and preparation method thereof

Abstract

The invention discloses ultrahigh-density twin titanium and a preparation method thereof. The method comprises three steps of rotary rolling, annealing treatment and cryogenic low-temperature cold rolling. The rotary rolling regulates and controls texture, so that a ultrahigh-strength texture titanium material with basal texture strength of 21.73 is obtained; the annealing treatment restores and eliminates microdefects and substructures, and reserves a high-strength texture with basal texture strength of 14.33; and the cryogenic low-temperature cold rolling deformation introduces an ultrahigh-density twin structure with a twin area fraction as high as 67.3% on the basis of the previous two procedures. The ultrahigh-density twin titanium prepared by the method has the yield strength of 850MPa or above and the tensile strength close to 1GP.

Description

technical field [0001] The invention relates to a method for preparing ultra-high-density twinned titanium, in particular to a material preparation method for controlling texture through rotary rolling and introducing ultra-high-density twins in combination with cryogenic rolling, and belongs to the field of material preparation. Background technique [0002] Due to its light weight, high specific strength, good corrosion resistance and excellent biocompatibility, titanium is being increasingly widely used in the fields of aerospace, automobiles and ships, and biomedicine. However, compared with general structural engineering materials, such as stainless steel and die steel, titanium has lower strength, which limits its further application in the industrial field. In order to improve the strength of titanium, it is an effective means to refine titanium grains by plastic deformation. The large plastic deformation technology has a remarkable ability to refine the grain, and c...

AI Technical Summary

Problems solved by technology

However, only by reducing the deformation temperature, although the twin density of titanium has been greatly improved compared with room temperature deformation, its limit density is still not ideal, and it is difficult to obtain high-density twins uniformly distributed in the entire grain.

Moreover, the degree of improvement in mechanical properties does not reflect the strengthening and toughening effect that nano-twins should have.

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