Crystal Structure Defects in Titanium Nickelide after Pressing at Lowered Temperature.

The experimental results regarding the effect of warm (573 K) pressing with an increase in the specified true strain, , up to 9.55, on the microstructure and crystal structure defects (dislocations, vacancies) of the TiNi (at %) alloy are presented. It is shown that all samples (regardless of ) have a two-level microstructure.

Structure and Phase State of TiNi (at%) Hydrogenated in Normal Saline.

The paper analyzes the surface structure and phase state of TiNi (at%) hydrogenated at 295 K in normal saline (0.9% NaCl aqueous solution with pH = 5.7) at 20 A/m for 0.

The Effect of Hydrogen on Martensite Transformations and the State of Hydrogen Atoms in Binary TiNi-Based Alloy with Different Grain Sizes.

The analysis presented here shows that in B2-phase of TiNi (at%) alloy, hydrogenation with further aging at room temperature decreases the temperatures of martensite transformations and then causes their suppression, due to hydrogen diffusion from the surface layer of specimens deep into its bulk. When hydrogen is charged, it first suppresses the transformations B2↔B19' and R↔B19' in the surface layer, and when its distribution over the volume becomes uniform, such transformations are suppressed throughout the material. The kinetics of hydrogen redistribution is determined by the hydrogen diffusion coefficient D, which depends on the grain size.

Yield Stress and Reversible Strain in Titanium Nickelide Alloys after Warm Abc Pressing.

The results of the position analysis of the yield stress τ on the "stress-strain" (τ-γ) dependences, received at the torsion of specimens of TiNi (at%) alloy are presented. The critical stress τ (IV), corresponding to the end of linear stage III and the beginning of the intensive development of plastic strain at stage IV, preceding the fracture of the specimens, were obtained as well. The structure of the specimens was transformed from coarse-grained to microcrystalline as a result of warm (723 K) abc pressing with a true deformation of 8.