Abstract
The paper presents the results of a research of microstructure and mechanical properties of bioinert alloys based on titanium, zirconium and niobium in ultrafi ne-grained condition. Ultrafi ne-grained condition was received by a combined method of severe plastic deformation, which included high-cycle abc-pressing at a given temperature regime, a multi-pass rolling in shaped rolls at room temperature and low temperature prerecrystallization annealing. The annealing increased the plasticity of alloys in ultrafi ne-grained condition without changing the grain size. In the two-stage severe plastic deformation and annealing the ultrafi ne-grained structure was formed in the alloys. The average element size of the grain-subgrain structure was 0.16 – 0.25 μm, which provided a signifi cant improvement in mechanical properties (ultimate strength, yield strength and microhardness) of the alloys compared to their original hard-grained or fi ne-crystalline conditions. At the same time, the formation of ultrafi ne-grained conditions in alloys did not lead to any change in the elastic modulus with a signifi cant increase in their strength and plasticity.
Highlights
The paper presents the results of a research of microstructure and mechanical properties of bioinert alloys based on titanium, zirconium and niobium in ultra¿ne-grained condition
Ultra¿ne-grained condition was received by a combined method of severe plastic deformation, which included high-cycle abc-pressing at a given temperature regime, a multi-pass rolling in shaped rolls at room temperature and low temperature prerecrystallization annealing
In the two-stage severe plastic deformation and annealing the ultra¿ne-grained structure was formed in the alloys
Summary
Ɉɪɟɞɫɬɚɜɥɟɧɵ ɪɟɡɭɥɶɬɚɬɵ ɢɫɫɥɟɞɨɜɚɧɢɹ ɦɢɤɪɨɫɬɪɭɤɬɭɪɵ ɢ ɦɟɯɚɧɢɱɟɫɤɢɯ ɫɜɨɣɫɬɜ ɛɢɨɢɧɟɪɬɧɵɯ ɫɩɥɚɜɨɜ ɧɚ ɨɫɧɨɜɟ ɬɢɬɚɧɚ, ɰɢɪɤɨɧɢɹ ɢ ɧɢɨɛɢɹ ɜ ɭɥɶɬɪɚɦɟɥɤɨɡɟɪɧɢɫɬɨɦ ɫɨɫɬɨɹɧɢɢ. Ȼ ɪɟɡɭɥɶɬɚɬɟ ɞɜɭɯɷɬɚɩɧɨɣ ɢɧɬɟɧɫɢɜɧɨɣ ɩɥɚɫɬɢɱɟɫɤɨɣ ɞɟɮɨɪɦɚɰɢɢ ɢ ɨɬɠɢɝɚ ɜ ɫɩɥɚɜɚɯ ɫɮɨɪɦɢɪɨɜɚɧɚ ɭɥɶɬɪɚɦɟɥɤɨɡɟɪɧɢɫɬɚɹ ɫɬɪɭɤɬɭɪɚ ɫɨ ɫɪɟɞɧɢɦ ɪɚɡɦɟɪɨɦ ɷɥɟɦɟɧɬɨɜ ɡɟɪɟɧɧɨɣ-ɫɭɛɡɟɪɟɧɧɨɣ ɫɬɪɭɤɬɭɪɵ 0,16 – 0,25 ɦɤɦ, ɤɨɬɨɪɚɹ ɨɛɟɫɩɟɱɢɜɚɥɚ ɡɧɚɱɢɬɟɥɶɧɨɟ ɩɨɜɵɲɟɧɢɟ ɭɪɨɜɧɹ ɦɟɯɚɧɢɱɟɫɤɢɯ ɫɜɨɣɫɬɜ (ɩɪɟɞɟɥ ɩɪɨɱɧɨɫɬɢ, ɩɪɟɞɟɥ ɬɟɤɭɱɟɫɬɢ ɢ ɦɢɤɪɨɬɜɟɪɞɨɫɬɶ) ɫɩɥɚɜɨɜ ɩɨ ɫɪɚɜɧɟɧɢɸ ɫ ɢɯ ɢɫɯɨɞɧɵɦ ɤɪɭɩɧɨɡɟɪɧɢɫɬɵɦ ɢɥɢ ɦɟɥɤɨɤɪɢɫɬɚɥɥɢɱɟɫɤɢɦ ɫɨɫɬɨɹɧɢɟɦ. [6 – 11], ɩɨɡɜɨɥɹɸɬ ɩɨɥɭɱɚɬɶ ɡɚɝɨɬɨɜɤɢ ɢ ɢɡɞɟɥɢɹ ɜ ɧɚɧɨɫɬɪɭɤɬɭɪɧɨɦ ɢ ɭɥɶɬɪɚɦɟɥɤɨɡɟɪɧɢɫɬɨɦ (ɍɆɁ) ɫɨɫɬɨɹɧɢɹɯ ɫɨ ɡɧɚɱɢɬɟɥɶɧɨ ɛɨɥɟɟ ɜɵɫɨɤɢɦɢ ɡɧɚɱɟɧɢɹɦɢ ɦɟɯɚɧɢɱɟɫɤɢɯ ɫɜɨɣɫɬɜ ɩɨ ɫɪɚɜɧɟɧɢɸ ɫ ɤɪɭɩɧɨɡɟɪɧɢɫɬɵɦ ɫɨɫɬɨɹɧɢɟɦ.
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