Material with a memory effect of the form

FIELD: medicine; instrument-making industry; radio industry; production of materials with a memory effect of the form.

SUBSTANCE: the invention is pertaining to the materials with a memory effect of the form and with the modified surface, which may be used as implants in medicine and as the temperature sensors, thermo-sensitive and executive elements and designs in instrument-making industry, the radio industry. The offered material consists of a base made out of a titanium nickelide of the following composition (in at. %): titanium - 49-51, nickel - the rest, and the surface layer modified by alloying elements. The modified surface layer is formed by irradiation with a low-energy high-current electronic beam and has a depth of 1000-2500 nanometers and the dimensions of the crystal grains of no more than 30 nanometers. In the capacity of the alloying elements it contains oxygen and carbon at the following ratio of components (in at. %): oxygen - 10-20, carbon - 10-15, titanium - 40-50, nickel - the rest. The technical result of the invention is production of the materials with an effect of memory of the form and a high degree capability of the form restoration both at a low and high deforming loadings.

EFFECT: the invention ensures production of the materials with an effect of memory of the form and a high degree capability of the form restoration both at a low and high deforming loadings.

1 tbl, 1 ex

 

The invention relates to materials with shape memory effect (APF) with a modified surface, which can be used as implants in medicine, as temperature sensors the sensing and actuating elements and structures in instrumentation, radio engineering, and so on

There are a large number of alloys with shape memory effect, such as Cu-Al, Cu-Al-Ni, Cu-Zn, Ag-Cd, Au-Cd, In-Tl, Ni-Al, Fe-Mn-Si, Fe-Pt, and alloys based on Ti-Ni [shape memory Effect in alloys. TRANS. from English. M.: metallurgy, 1979, 472 S.; Alloys with shape memory effect. K. Ootsuka, K. Shimizu, Y. Suzuki and other Lane. with the Japanese. - M.: metallurgy, 1990, 224 S.]. However, when the deformation under high loads in these materials during subsequent heating of significant nedovoza original form, i.e. a low degree of termovosstanovleniyu.

Known material based on Nickel-titanium shape memory effect with a modified method of nitrogen ion implantation surface [Nalesnik I., Yasenchak Û.F., Misurkin N.A., Itin VI, günter VE Effect of electropolishing and ion implantation of nitrogen into the surface of the electrochemical behaviour of titanium and Nickel-titanium in NaCl solution. Implants with shape memory. 1992, No. 4, p.53-58.]. The yield strength of this material is high, but at high loads in it developing processes plastic Def is rmacie, resulting in permanent deformation after heating and to incomplete formulastring sample.

The closest analogue on essential features of the present invention is a memory shape material based on titanium nickelide, consisting of a support and a surface layer, modified alloying elements [RF patent №2191842, With 22 19/03, priority 18.08.2000]. However, the degree of termovosstanovleniyu of this material at high deforming load is not large enough.

An urgent task is the creation of materials with APF with a high degree of termovosstanovleniyu both at small and at large deforming loads.

This technical result is achieved in that the material with shape memory effect, consisting of a support and a surface layer, modified alloying elements by processing low-energy high-current electron beam (NSEP), has a thickness of the surface layer 1000-2500 nm, a crystallite size in not more than 30 nm.

As the basis of the selected nickelide titanium of the following composition, at.%:

titanium49-51
Nickelthe rest,

the chemical composition of the surface layer has a ratio of elements, the so%:

oxygen10-20
carbon10-15
titanium40-50
Nickelthe rest of it.

Material with APF and therefore the surface layer even when large deforming stress accumulates small plastic deformation, and the degree of termovosstanovleniyu when unloading or during subsequent heating. Value APF and the temperature interval manifestations EPP material practically does not change.

These properties are achieved by the fact that the irradiation of the material with EPF low-energy high-current electron beam leads to pulsed melting of the surface layer. During the existence of the liquid phase, this layer is saturated with impurities of oxygen and carbon coming into the melt from the residual atmosphere of the working chamber, in which the irradiation. After completion of the pulse during high-speed crystallization of the molten layer is formed of fine-grained structure of the matrix phase containing fine particles of oxides and carbides. In the grain boundary and dispersion mechanisms of hardening is an increase in the tensile strength and the reduction of plastic deformation in the material under the application of external loads.

Thus, a surface layer that is different from the base material with APF chemical and phase compositions, microcrystalline structure, high strength characteristics and retains a high adhesive communication settings.

The thickness of the surface layer of the material with APF is determined from the condition that when the thickness is smaller, the degree of termovosstanovleniyu material after deformation strain is reduced to the level of the material of the prototype, and if greater thickness is reduced the amount APP. The maximum size of the crystallites and grains of matter in the surface layer due to the technological mode of obtaining such a surface layer, in addition, a fine grain size contributes to the increase of the yield stress in the surface layer, which also reduces the amount of plastic deformation and retains a high degree of termovosstanovleniyu after application to the material of large deforming loads. The percentage in the surface layer of oxygen and carbon is determined by the fact that the decline below 10 at.% it leads to the formation in the surface layer of a sufficient number of oxides and carbides, which increases the yield strength of this layer, and to increase their number more than 20 and 15 at.% accordingly leads to the excessive embrittlement of the surface layer.

To Tsentralny interval titanium content in the base material with APP of titanium-Nickel alloys is determined by that decline below 49 at.% or increase above 51 at.% can lead to the selection in the intermetallic compound of secondary phases, which do not have the ability to martensitic transformations and their presence can lead to the degeneration of martensitic transformation in the bulk material and reduce the magnitude of APP.

The production of a material with APP with a modified surface consisting of a base and modified alloying elements in the surface layer, having a thickness of 1000 to 2500 nm and the crystallite size in not more than 30 nm, it is impossible by known methods.

The invention is carried out as follows.

Example: Material with APF with surface modified layer was prepared in stages. Nickelide titanium composition Ti-a 50.5 at.% Ni smelted six-arc melting in argon atmosphere component: titanium iodide, Nickel brand H0. After melting the ingot was subjected to extrusion, and then drawing with intermediate anneals. The samples obtained in the form of a wire with a diameter of 2 mm and a length of 70 mm electrolytic polishing.

The samples were irradiated with low-energy high-current electron beam with parameters: mean electron energy of 15 - 20 Kev, the energy density per pulse 5-8 j/cm2the pulse duration of 1.5 to 3.5 μs, the number of pulses in the series of 10-100, the repetition frequency of them is alsow 0.1 Hz. Irradiation was carried out in a technical vacuum of 10-4-10-5mm Hg containing a controlled amount of impurities of oxygen and carbon.

Chemical composition and structural-phase state of the surface layer of the samples in the initial state and after irradiation of the pulsed electron beam was controlled by Auger analysis and x-ray analysis.

The magnitude and temperature intervals manifestations APP, the residual deformation after the application of various deforming load was determined on the installation type reverse torsion pendulum. The experimental design is as follows: above the temperature of martensitic transformations to the sample was made permanent twisting moment forces. Loaded the sample was cooled below the temperature of martensitic transformations. Then shot a load and was carried out by heating the sample in a free state in the interval of martensitic transformations. On two composing the potentiometer H-307 recorded magnitude of deformation and temperature intervals accumulation and return deformation.

From the table it is seen that the proposed materials with IPF have a small amount of permanent deformation, providing a high degree of termovosstanovleniyu compared to the prototype.

47
Table is.
No.MaterialThe composition of the modified layer depth at.%The amount of permanent deformation when formulastring after deformation under load %Parameters NSEPNote
100 nm500 nm1000 nm2500 nm3000 nm100 MPa300 MPa500 MPa700 MPa900 MPa1100 MPaEnergy density, j/cm2The number of pulses
1TiNi without surface modification3333300,42,5612More than 20
About44444
Ti4646464646
Ni47474747
2TiNi NSEP treatment111410103000,31,236612
About201610104
Ti4041434346
Ni2929373747
3TiNi NSEP treatment101512113000,31,135,87,570
About181312114
Ti4444454546
Ni28283133 47
4TiNi NSEP treatment101211103000,41,33,16,15,530
O161412104
Ti4344454746
Ni3130323347
5TiNi implanted surface9433300,32,35,510More than 20The placeholder
O425444
Ti3845464646
Ni1146 474747

Material with shape memory effect with a modified surface, consisting of a support made of titanium nickelide the following composition, at.%: titanium 49-51, Nickel else, and modified alloying elements in the surface layer, characterized in that the modified surface layer is formed by irradiation with low-energy high-current electron beam, has a thickness of 1000-2500 nm and a crystallite size of not more than 30 nm, and as alloying elements it contains oxygen and carbon, in the following ratio of components, at.%: oxygen 10-20, carbon 10-15, titanium 40-50, Nickel else.



 

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2 cl, 1 tbl, 1 ex

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16 cl, 3 tbl, 1 ex, 15 dwg

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2 cl, 1 tbl, 1 ex

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FIELD: metallurgy, namely processes for forging titanium alloys and blank of such alloy suitable for forging.

SUBSTANCE: method comprises steps of preparing blank and forging it. Forging is realized at providing mechanical hardening factor equal to 1.2 or less and at difference of hardness values between central (along width) zone and near-surface zone equal to 60 or less by Vickers. Factor of mechanical hardening is determined as HV(def)/HV(ini), where HV(ini) - hardness of titanium alloy blank before forging; HV(def) -hardness of titanium alloy blank after forging at forging reduction 20%. Forging may be realized at deformation rate from 2 x 10 -4 s -1 to 1s-1 while keeping relations (T β - 400)°C ≤ Tm ≤ 900°C and 400°C ≤ Td ≤ 700°C, where Tβ (°C) -temperature of β-phase transition of titanium alloy, T m(°C) - temperature of worked blank; Td(°C) - temperature of die set. Blank has factor of mechanical hardening 1.2 or less and difference of hardness values between central (along width) zone and near-surface zone equal to 60 or less by Vickers.

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8 cl, 5 tbl, 6 dwg, 4 ex

FIELD: metallurgy.

SUBSTANCE: invention proposes titanium-base alloy and article made of thereof. Alloy comprising aluminum, molybdenum, vanadium, chrome, iron, zirconium, oxygen, carbon, hydrogen, nitrogen, copper and nickel comprises additionally silicon and tungsten in the following ratio of components, wt.-%: aluminum, 2.0-6.8; molybdenum, 1.0-3.5; vanadium, 3.0-6.0; chrome, 0.4-1.6; iron, 0.2-1.2; zirconium, 0.01-0.3; oxygen, 0.04-0.14; carbon, 0.02-0.1; hydrogen, 0.003-0.02; nitrogen, 0.005-0.05; copper, 0.001-0.1; nickel, 0.001-0.01; silicon, 0.02-0.15; tungsten, 0.001-0.03, and titanium, the balance. Invention provides the development of titanium alloys designated for making plane stringers, ribs, frames, fuselage, wings and engines and for applying as material for welding. Invention provides enhancing strength and crack-resistance of the basic alloy and welding joints and reducing article mass.

EFFECT: improved properties and quality of alloy.

3 cl, 2 tbl, 3 ex

FIELD: non-ferrous metallurgy; methods of titanium alloy bricks production.

SUBSTANCE: the invention is pertaining to the field of non-ferrous metallurgy, in particular, to the brick made out of α+β titanium alloy and to a method of its manufacture. The offered brick consists of the following components (in mass %): aluminum - 4-5, vanadium - 2.5-3.5, iron - 1.5-2.5, molybdenum - 1.5-2.5, titanium - the rest. At that the alloy out of which the brick is manufactured, contains - 10-90 volumetric % of the primary α-phase. The average grain size of the primary α-phase makes 10 microns or less in a cross-section plain parallel to the brick rolling direction. Elongation of grain of the primary α -phase is the four-fold or less. The offered method of manufacture of the given brick includes a stage of a hot rolling. At that before the stage of the hot rolling conduct a stage of the alloy heating at the surfaces temperature (Tβ-150)- Tβ°C. During realization of the stage of the hot rolling the surface temperature is kept within the range of (Tβ-300)-( Tβ -50)°C, and the final surface temperature, that is a surface temperature directly after the last rolling, makes (Tβ-300)-( Tβ-100)°C, where Tβ is a temperature of α/β-transition. The technical result of the invention is formation of a brick out of the high-strength titanium alloy having a super pliability, excellent fatigue characteristics and moldability.

EFFECT: the invention ensures production of a brick out of the high-strength titanium alloy having a super pliability, excellent fatigue characteristics and moldability.

7 cl, 7 dwg, 21 tbl, 2 ex

FIELD: nonferrous metallurgy; aircraft industry; mechanical engineering; development of alloys on the basis of titanium.

SUBSTANCE: the invention is pertaining to the field of nonferrous metallurgy, in particular, to development of alloys on the base of titanium, working at the heightened temperatures. It may be used in an aircraft industry for manufacture of components, for example, disks, vanes, rings, and also in mechanical engineering. The invention presents an alloy based on titanium and a hardware product produced out of it. The alloy contains aluminum, zirconium, stannum, niobium, a molybdenum, silicon, carbon and oxygen. At that it in addition contains tungsten and iron, at the following ratio of components (in mass %): aluminum 5.8 - 6.6, zirconium 2.0 - 4.0, stannum - 2.5 - 4.5, niobium - 0.8-2.5, molybdenum - 0.8- 1.5, silicon - 0.25-0.45, carbon - 0.05-0.1, oxygen -0.05-0.12, tungsten - 0.35-0.8, iron - 0.06-0.13, titanium - the rest. The technical result is a development of an alloy having the lower weight at the given short-time strength and a specific low-cycle fatigue, that increases an operational life and reliability of the components of the hot tract of aero-engines.

EFFECT: the invention ensures development of an alloy with the lower weight at the given short-time strength and a specific low-cycle fatigue with increased operational life and reliability.

2 cl, 2 tbl, 3 ex

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