CN113293324B - Titanium niobium molybdenum alloy with high service temperature and adjustable thermal expansion coefficient and preparation method and application thereof - Google Patents
Titanium niobium molybdenum alloy with high service temperature and adjustable thermal expansion coefficient and preparation method and application thereof Download PDFInfo
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2201/00—Treatment for obtaining particular effects
Abstract
The invention discloses a titanium niobium molybdenum alloy with high service temperature and adjustable thermal expansion coefficient, a preparation method and application thereof, wherein the alloy comprises the following elements in percentage by weight: 24.9-25.1 wt.%, Mo: 5.8-6.2 wt.%, and the balance Ti; the preparation process comprises the following steps: adding raw materials, smelting to obtain alloy ingots with uniform components, carrying out solution treatment after hot forging to be rod-shaped, and then quenching and cooling; removing oxide skin on the surface of the bar, and performing cold rolling to obtain a structure of beta + alpha' phase; pre-ageing the alloy at-8.8X 10 in rolling direction at 25-380 deg.C by changing the content of alpha' phase‑6/K～+0.8×10‑6Adjustable average thermal expansion coefficient of/K. The titanium niobium molybdenum alloy prepared by the invention is suitable for preparing high-performance temperature sensitive elements such as thermal switches, intelligent valves and the like and precision instrument components with high dimensional stability requirements.
Description
Technical Field
The invention belongs to titanium alloy preparation, and particularly relates to a titanium-niobium-molybdenum alloy with high service temperature and adjustable thermal expansion coefficient, and a preparation method and application thereof.
Background
Thermal expansion is a phenomenon in which the length or volume of an object changes due to a temperature rise, and is essentially a macroscopic effect due to the thermal vibration effect of lattice atoms. Metal materials generally have a positive thermal expansion coefficient, which is intrinsic and difficult to control. When large temperature change occurs, the precision of a precision instrument is reduced due to the thermal expansion of materials, and thermal stress is generated due to the mismatch of thermal expansion coefficients, so that the coating of the device is damaged by fatigue and even falls off. The advent of negative or very low expansion metallic materials has provided a new approach to solving such problems: the positive thermal expansion material and the negative thermal expansion material are compounded to obtain a proper expansion coefficient, so that the problem of expansion coefficient mismatch is solved; the low-expansion and even zero-expansion material is prepared, and the precision of a precision instrument can be obviously improved. In addition, the composite material with positive thermal expansion and the composite material with high negative thermal expansion can be used for preparing high-performance temperature sensitive elements such as thermal switches, intelligent valves and the like. Therefore, in recent years, metal materials having a negative, low, or (near) zero thermal expansion coefficient have received much attention from researchers.
Currently, among metal materials, the most widely known zero thermal expansion material is Fe-36Ni alloy (invar alloy) found in 1897, but it can exhibit zero expansion characteristics only in a narrow temperature range (-80 ℃ to 100 ℃) and has a low use temperature (c) ((<100 deg.C). Among Ti alloys, researchers at home and abroad have reported several negative thermal expansion and zero expansion titanium alloys in succession, for example, Ti-35Nb-2Ta-3Zr-0.3O (wt.%) alloy has an average linear thermal expansion coefficient of 2.0X 10 in the rolling direction after 90% cold rolling-6K-1(-173 ℃ -227 ℃), close to invar (T.Saito, et al, multifunctionally alloyed a dis-location-free plastic deformation mechanism 300(2003) 464-; the Ti-24Nb-4Zr-8Sn (wt.%) alloy is subjected to 95% hot rolling, then 9% loading and unloading, and after the alloy is subjected to the rolling direction, the alloy obtains-7 x 10 in the range of 20-300 DEG C-6K-1Average negative linear Thermal Expansion coefficient (Y.L.Hao, et al, Superelasticity and tubular Thermal Expansion across a Wide Temperature range. J.Mater.Sci.Techniol.32 (2016)705- > 709). In the patent of the applicant's earlier application, publication No. CN 112553501A, a Ti-Nb alloy was subjected to a 90% cold rolling with varying Nb content (34 wt% to 40 wt%) and a temperature range of-33.0X 10 in the rolling direction at 25 ℃ to 300 ℃ in the rolling direction-6/K～-2.0×10-6An adjustable negative thermal expansion coefficient of/K; the patent publication No. CN 112458336A, a Ti-Nb-O alloy (Nb: 34.0 wt% -34.1 wt%, O: 0 wt% -0.6 wt%) is subjected to 90% cold rolling, by changing the O content (0 wt% -0.6 wt%), having a temperature range of-28.8X 10 in the rolling direction at 25 deg.C-380 deg.C-6/K～-8.3×10-6An adjustable negative thermal expansion coefficient of/K; the patent publication No. CN 112680681A, which is to perform 90% cold rolling of Ti-Nb-O alloy (Nb: 34.0%; O: 0.11%), and then perform pre-aging treatment at 300 ℃ for 0 min-150 min, and has a temperature range of-33.0X 10 in the rolling direction at 25 ℃ to 300 ℃-6/K～0.4×10-6Adjustable coefficient of thermal expansion of/K. In each of the above patents, CN 112680681A, adjustable thermal expansion can be obtained in a wide temperature range by changing only the pre-aging time without changing the alloy compositionHowever, the alloy of this patent has the disadvantages of narrow temperature range (25-300 ℃), long pretreatment time (0-150 min), and the like, and the alloy of this patent, such as patent publication No. CN 112458336A, can reach the temperature range (25-380 ℃), but the alloy needs to change the alloy composition (changing the O content, changing the alloy composition) to adjust the negative expansion coefficient.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides the titanium niobium molybdenum alloy with the adjustable thermal expansion coefficient and high service temperature, the thermal expansion coefficient of the titanium niobium molybdenum alloy can be adjusted in a large temperature range, negative thermal expansion, near-zero expansion and positive thermal expansion can be realized, and the service temperature is high.
The invention also provides a preparation method and application of the titanium niobium molybdenum alloy with high service temperature and adjustable thermal expansion coefficient.
The technical scheme is as follows: in order to achieve the above purpose, the present invention provides a titanium-niobium-molybdenum alloy with controllable thermal expansion coefficient and high service temperature, wherein the alloy comprises the following elements by weight: 24.9-25.1 wt.%; mo: 5.8-6.2 wt.%; the balance being Ti.
The preparation method of the titanium niobium molybdenum alloy with high service temperature and adjustable thermal expansion coefficient comprises the following steps:
(1) smelting Ti, Nb and Mo raw materials in proportion to obtain a titanium-niobium-molybdenum alloy ingot;
(2) hot forging the titanium-niobium-molybdenum alloy cast ingot into a rod shape;
(3) carrying out solid solution treatment on the rod-shaped titanium niobium molybdenum alloy, and then quenching and cooling;
(4) removing oxide skin on the surface of the bar cooled in the step (3), and then carrying out cold rolling;
(5) and (4) performing pre-aging treatment on the alloy subjected to cold rolling in the step (4) to obtain the titanium-niobium-molybdenum alloy with high service temperature and adjustable thermal expansion coefficient.
The smelting in the step (1) is to put Ti, Nb and Mo raw materials into a vacuum non-consumable arc smelting furnace according to a proportion for repeated smelting as long as the components are uniform.
Wherein the hot forging in the step (2) is carried out in air at 850-1000 ℃ and 60-80% of deformation.
Wherein the solution treatment in the step (3) is carried out at 850-950 ℃ for 30-60 min.
Wherein, the structure is beta + alpha' phase after the solution treatment in the step (3) and then the quenching and cooling.
Wherein, the cold rolling in the step (4) is the cold rolling with the deformation rate of 92-95%.
Wherein the pre-aging treatment in the step (5) is to perform pre-aging treatment on the alloy for 0 to 60 seconds at 380 to 382 ℃.
Wherein, the preaging treatment in the step (5) is used for obtaining the titanium niobium molybdenum alloy with high service temperature and adjustable thermal expansion coefficient by changing the content of the alpha' phase.
Preferably, the Ti, Nb and Mo raw materials have a purity of 99.9 wt% or more.
Wherein the adjustable thermal expansion coefficient means that the alloy has a temperature of-8.8 multiplied by 10 within the temperature range of 25 ℃ to 380 ℃ along the rolling direction (such as rolling into a round bar shape, and the rolling direction is along the axial direction)-6/K～+0.8×10-6A controllable average thermal expansion coefficient of/K.
The titanium niobium molybdenum alloy with high service temperature and adjustable thermal expansion coefficient is applied to preparing high-performance temperature sensitive elements and high-size high-stability precision instrument components.
The titanium niobium molybdenum alloy with high service temperature and adjustable thermal expansion coefficient can adjust the thermal expansion coefficient in a larger range through pre-aging treatment, has high service temperature, and is suitable for preparing high-performance temperature sensitive elements such as thermal switches, intelligent valves and the like and precision instrument components with high dimensional stability requirements.
The titanium-niobium-molybdenum alloy prepared by the invention comprises Ti- (24.9-25.1) Nb- (5.8-6.2) Mo, and is composed of beta and alpha' phases after cold rolling and pre-aging (figure 1). The alloy is subjected to 92 to 95 percent of cold deformation to generate the alloy parallel to the rolling direction<110>βAnd<010>α″is strongly textured, and<110>β//<010>α″. In the alloy temperature-rising stage, the alpha ' phase is heated and continuously decomposed to be converted into the beta phase, namely alpha ' → beta (according to the Bragg equation, the lattice constants of alpha ' and beta can be calculated by the XRD spectrum of figure 1, and the finding can be realized
) According to the crystallography relation, the length in the rolling direction is continuously reduced; in the alloy cooling stage, the length of the rolling direction is increased continuously from beta → alpha', so that the alloy has different thermal expansion coefficients. The rolling with the large deformation rate of more than 90 percent can form strong texture in the rolling direction, thereby increasing the thermal expansion coefficient of the rolling direction.
The atomic radii of Ti, Nb and Mo in the alloy prepared by the method are 0.145nm, 0.148nm and 0.140nm respectively. Because the radius difference between the Mo atom and the Ti atom is large, the distortion caused by the diffusion of the Mo atom in the Ti matrix is higher than that of the Nb atom, and the diffusion is more difficult than that of the Nb atom. Therefore, the alloy of the present invention can improve the thermal stability of the α "phase by partially replacing the Nb atom with the Mo atom. As can be seen from fig. 3, the temperature range in which the slope of the strain-temperature curve is negative (corresponding to negative thermal expansion) extends to about 380 ℃, i.e., the α ″ phase has not been completely decomposed at 380 ℃, which makes the applicable temperature range of the alloy having negative expansion (or near zero expansion) characteristics significantly higher than that of the existing titanium alloy. Meanwhile, when the cold-rolled alloy is subjected to 0-60 s of pre-aging treatment at 380 ℃, the alpha' phase content is gradually reduced along with the time extension (figure 1 and figure 2), so that the alloy is ensured to have a large-range adjustable average thermal expansion coefficient.
The invention adopts Mo atoms to partially replace Nb atoms to improve the thermal stability of the alpha 'phase, so that the temperature range in which the alpha' phase can exist is larger, and meanwhile, the alloy prepared by the invention can obtain the adjustable thermal expansion coefficient in a wider temperature range (25-380 ℃) only by changing the pre-aging treatment time without changing the alloy components.
Has the advantages that: compared with the prior art, the invention has the following advantages:
1. the titanium niobium molybdenum alloy of the invention has adjustability in a wide temperature range of 25-380 DEG CCoefficient of thermal expansion of the joint (-8.8X 10)-6/K～+0.8×10-6and/K), compared with other titanium alloys, the alloy has a large thermal expansion coefficient adjusting range, can realize negative expansion, near-zero expansion and positive expansion, particularly has a high usable temperature which can reach 380 ℃, and is suitable for preparing high-performance temperature sensitive elements such as thermal switches, intelligent valves and the like and precise instrument components with high dimensional stability requirements. The higher the usable temperature of the low-expansion, near-zero-expansion member material, the more beneficial it is for precision instruments requiring high dimensional stability, and the wider the usable temperature range.
2. The preparation process of the alloy is simple and convenient, and particularly the required pretreatment time is short (0-60 s), while the pretreatment time in the prior art is longer (0-150 min).
Drawings
FIG. 1 is an XRD (X-ray diffraction) spectrum of a titanium-niobium-molybdenum alloy prepared in embodiments 1-5 of the invention;
FIG. 2 is a graph showing a peak height ratio I according to diffraction intensity in FIG. 1α″(020)/Iβ(110)The volume fraction of the alpha' phase obtained;
FIG. 3 is the curve of the rolling strain with temperature rise after the alloy of the present invention is pre-aged at 380-382 deg.C for different time.
Detailed Description
The invention will be further described with reference to specific embodiments and the accompanying drawings.
The experimental methods described in the examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
Wherein the purities of the Ti, Nb and Mo raw materials are all more than 99.9 wt%.
Example 1
The preparation method of the titanium niobium molybdenum alloy comprises the following steps:
(1) preparing an alloy by taking Ti, Nb and Mo powder as raw materials, and weighing the following substances by weight: ti: 69g of a mixture; nb: 25g of the total weight of the mixture; mo: 6.0 g; the weight percentages of the elements of the prepared alloy are as follows: nb: 25 percent; mo: 6.0 percent of Ti, and the balance of Ti; repeatedly smelting the prepared raw materials in a magnetically-stirred vacuum non-consumable electric arc furnace for five times to obtain an ingot with uniform components;
(2) hot forging the cast ingot into a bar at 850 ℃ with the deformation amount of 80 percent in the air;
(3) carrying out solution treatment on the bar obtained in the step (2) at 950 ℃ for 60min, and then putting the bar into water for quenching and cooling to obtain a beta + alpha' phase with a structure;
(4) turning to remove oxide skin on the surface of the bar, and then performing cold rolling deformation with the deformation of 95% at room temperature. After the treatment, the alloy with the phase composition of beta matrix and a small amount of alpha phase is obtained; the volume fraction of the alpha "phase in the alloy was calculated to be 0.202. The average expansion coefficient alpha of the alloy in the rolling direction is in the range of 25-380 DEG C25℃-380℃＝-8.8×10-6and/K, has negative thermal expansion characteristic, the volume fraction of the obtained alpha' phase is the largest, and the negative expansion coefficient (absolute value) is also the largest.
Example 2
The preparation method of the titanium niobium molybdenum alloy comprises the following steps:
(1) preparing an alloy by taking Ti, Nb and Mo powder as raw materials, and weighing the following substances by weight: ti: 69g of a mixture; nb: 25g of the total weight of the mixture; mo: 6.0 g; the weight percentages of the elements of the prepared alloy are as follows: nb: 25 percent; mo: 6.0 percent of Ti, and the balance of Ti; repeatedly smelting the prepared raw materials in a magnetically-stirred vacuum non-consumable electric arc furnace for five times to obtain an ingot with uniform components;
(2) hot forging the cast ingot into a bar at 850 ℃ with the deformation amount of 80 percent in the air;
(3) carrying out solution treatment on the bar obtained in the step (2) at 950 ℃ for 60min, and then putting the bar into water for quenching and cooling to obtain a beta + alpha' phase with a structure;
(4) turning to remove oxide skin on the surface of the bar, and then performing cold rolling deformation with the deformation of 95% at room temperature;
(5) and (4) performing pre-aging treatment on the cold-rolled bar in the step (4) at 380 ℃ for 10 s. After the treatment, the alloy with the phase composition of beta matrix and a small amount of alpha phase is obtained; the volume fraction of the alpha "phase in the alloy was calculated to be 0.153. The average expansion coefficient alpha of the alloy in the rolling direction is in the range of 25-380 DEG C25℃-380℃＝-6.4×10-6K, toolHas negative thermal expansion characteristics.
Example 3
The preparation method of the titanium niobium molybdenum alloy comprises the following steps:
the pre-ageing time for the cold rolled bar of example 2 was increased to 20s, and the rest of the process was exactly the same as in example 2. After the treatment, the alloy phase composition becomes a beta matrix plus a small amount of alpha' phase; the volume fraction of the alpha "phase in the alloy was calculated to be 0.140. The average expansion coefficient alpha of the alloy in the rolling direction is in the range of 25-380 DEG C25℃-380℃＝-4.6×10-6and/K, has negative thermal expansion characteristics.
Example 4
The pre-ageing time for the cold rolled bar of example 2 was increased to 45s, and the rest of the process was exactly the same as in example 2. After the treatment, the alloy phase composition becomes a beta matrix plus a small amount of alpha' phase; the volume fraction of the alpha "phase was calculated to be 0.139. The average expansion coefficient alpha of the alloy along the rolling direction in the range of 25-380 DEG C25℃-380℃＝-2.4×10-6and/K, has negative thermal expansion characteristics.
Example 5
The pre-ageing time for the cold rolled bar of example 2 was increased to 60s, and the rest of the process was exactly the same as in example 2. After the treatment, the alloy phase composition becomes a beta matrix plus a small amount of alpha' phase; the volume fraction of the alpha "phase was calculated to be 0.137. The average expansion coefficient alpha of the alloy along the rolling direction in the range of 25-380 DEG C25℃-380℃＝0.8×10-6and/K, has positive thermal expansion characteristics.
Example 6
The preparation method of the titanium niobium molybdenum alloy comprises the following steps:
(1) preparing an alloy by taking Ti, Nb and Mo powder as raw materials, and weighing the following substances by weight: ti: 69.1 g; nb: 25.1 g; mo: 5.8 g; the weight percentages of the elements of the prepared alloy are as follows: nb: 25.1 percent; mo: 5.8 percent, and the balance being Ti; repeatedly smelting the prepared raw materials in a magnetically-stirred vacuum non-consumable electric arc furnace for five times to obtain an ingot with uniform components;
(2) hot forging the cast ingot into a bar at 1000 ℃ with the deformation amount of 70 percent in the air;
(3) carrying out solution treatment on the bar obtained in the step (2) at 900 ℃ for 45min, and then putting the bar into water for quenching and cooling to obtain a beta + alpha' phase with a structure;
(4) turning to remove oxide skin on the surface of the bar, and then performing cold rolling deformation with the deformation of 92% at room temperature.
(5) And (5) performing pre-aging treatment on the cold-rolled bar in the step (4) at 380 ℃ for 45 s. After the treatment, the alloy with the phase composition of beta matrix and a small amount of alpha phase is obtained.
Example 7
The preparation method of the titanium niobium molybdenum alloy comprises the following steps:
(1) preparing an alloy by taking Ti, Nb and Mo powder as raw materials, and weighing the following substances by weight: ti: 68.8 g; nb: 25.0 g; mo: 6.2 g; the weight percentages of the elements of the prepared alloy are as follows: nb: 25.0 percent; mo: 6.2 percent, and the balance being Ti; repeatedly smelting the prepared raw materials in a magnetically-stirred vacuum non-consumable electric arc furnace for five times to obtain an ingot with uniform components;
(2) hot forging the cast ingot into a bar at 900 ℃, wherein the deformation amount is 60 percent, and the hot forging is carried out in the air;
(3) carrying out solution treatment on the bar obtained in the step (2) at 850 ℃ for 30min, and then putting the bar into water for quenching and cooling to obtain a beta + alpha' phase with a structure;
(4) turning to remove oxide skin on the surface of the bar, and then performing cold rolling deformation with the deformation of 93% at room temperature;
(5) and (5) performing pre-aging treatment on the cold-rolled bar in the step (4) at 382 ℃ for 20 s. After the treatment, the alloy with the phase composition of beta matrix and a small amount of alpha phase is obtained.
Example 8
Example 8 is the same as example 2, except that: preparing an alloy by taking Ti, Nb and Mo powder as raw materials, and weighing the following substances by weight: ti: 68.9 g; nb: 24.9 g; mo: 6.2 g; the weight percentages of the elements of the prepared alloy are as follows: nb: 24.9 percent; mo: 6.2 percent, and the balance being Ti.
The titanium niobium molybdenum alloys prepared in examples 6 to 8 all had average coefficients of expansion of-8.8X 10 over a wide temperature range of 25 ℃ to 380 ℃-6/K～+0.8×10-6In the range of/K.
As can be seen from examples 1 to 5, FIGS. 1 and 2, the alloy after cold rolling (CR state) consists of a phase of β + α ". As the pre-aging treatment time is prolonged, the peak height of the alpha 'phase is gradually reduced, and the volume content of the alpha' phase is gradually reduced. As can be seen from FIG. 3, the average thermal expansion coefficient alpha of the alloy between 25 ℃ and 380 ℃ increases with the pre-aging treatment time25℃-380℃from-8.8X 10-6the/K (unaged, example 1) is gradually changed to-2.4X 10-6K (Pre-ageing time 45s, example 4) and 0.8X 10-6The coefficient of expansion can be adjusted to zero at pre-ageing times between 45s and 60 s/K (example 5).
The method of the invention firstly obtains the alloy consisting of beta + alpha' phase, and then obtains the alloy parallel to the rolling direction by the cold rolling of large deformation quantity<110>βAnd<010>α″strong texture, finally, the transformation from the alpha 'phase to the beta phase is realized by adding a pre-aging treatment step, and the volume fraction of the alpha' phase in the alloy is adjusted by adjusting the pre-aging treatment time, thereby realizing the adjustment of the thermal expansion coefficient of the alloy along the rolling direction. When the preaging time is changed within the range of 0 s-60 s, the volume fraction (ratio) of alpha' phase in the alloy can be changed within a large range, so that the alloy has-8.8 multiplied by 10 within the temperature range of 25 ℃ to 380 ℃ along the rolling direction-6/K～0.8×10-6Adjustable coefficient of thermal expansion.
Claims (8)
1. The titanium-niobium-molybdenum alloy with the adjustable thermal expansion coefficient and the high service temperature is characterized in that the alloy comprises the following elements in percentage by weight Nb: 24.9-25.1 wt.%; mo: 5.8-6.2 wt.%; the balance being Ti;
the preparation method of the titanium niobium molybdenum alloy with high service temperature and adjustable thermal expansion coefficient comprises the following steps:
(1) smelting Ti, Nb and Mo raw materials in proportion to obtain a titanium-niobium-molybdenum alloy ingot;
(2) hot forging the titanium-niobium-molybdenum alloy cast ingot into a rod shape;
(3) carrying out solid solution treatment on the rod-shaped titanium niobium molybdenum alloy, and then quenching and cooling;
(4) removing oxide skin on the surface of the bar cooled in the step (3), and then carrying out cold rolling;
(5) performing pre-aging treatment on the alloy subjected to cold rolling in the step (4) to obtain a titanium-niobium-molybdenum alloy with high service temperature and adjustable thermal expansion coefficient;
wherein, the structure is beta + alpha' phase after the solution treatment in the step (3) and then the quenching and cooling; and (4) the cold rolling in the step (4) is the cold rolling with the deformation rate of 92-95%.
2. A method of making the titanium niobium molybdenum alloy of controllable thermal expansion coefficient with high service temperature of claim 1, comprising the steps of:
(1) smelting Ti, Nb and Mo raw materials in proportion to obtain a titanium-niobium-molybdenum alloy ingot;
(2) hot forging the titanium-niobium-molybdenum alloy cast ingot into a rod shape;
(3) carrying out solid solution treatment on the rod-shaped titanium niobium molybdenum alloy, and then quenching and cooling;
(4) removing oxide skin on the surface of the bar cooled in the step (3), and then carrying out cold rolling;
(5) performing pre-aging treatment on the alloy subjected to cold rolling in the step (4) to obtain a titanium-niobium-molybdenum alloy with high service temperature and adjustable thermal expansion coefficient;
wherein, the structure is beta + alpha' phase after the solution treatment in the step (3) and then the quenching and cooling; and (4) the cold rolling in the step (4) is the cold rolling with the deformation rate of 92-95%.
3. The preparation method according to claim 2, wherein the smelting in the step (1) is repeatedly smelting by putting raw materials of Ti, Nb and Mo into a vacuum non-consumable arc smelting furnace according to a proportion.
4. The method according to claim 2, wherein the hot forging temperature in the step (2) is 850 to 1000 ℃ and the deformation amount is 60 to 80%.
5. The method according to claim 2, wherein the solution treatment in step (3) is carried out at 850 to 950 ℃ for 30 to 60 min.
6. The method according to claim 2, wherein the pre-aging treatment in the step (5) is performed by pre-aging the alloy at 380 to 382 ℃ for 0 to 60 seconds.
7. The method of claim 2, wherein the pre-aging treatment of step (5) is performed by varying the α "phase content to obtain a titanium niobium molybdenum alloy with a controllable thermal expansion coefficient at a high service temperature.
8. Use of the alloy of claim 1 for the preparation of high performance temperature sensitive elements and precision instrument components of high dimensional stability.
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| DE3261668D1 (en) * | 1981-03-23 | 1985-02-07 | Bbc Brown Boveri & Cie | Process for the manufacture of components from a titanium-base alloy, the component obtained this way, and its use |
| JP2761694B2 (en) * | 1992-02-05 | 1998-06-04 | 住友金属工業株式会社 | Clad wire |
| CN112680681B (en) * | 2020-11-27 | 2022-04-12 | 东南大学 | Preparation method of titanium-niobium alloy with adjustable negative thermal expansion coefficient |
| CN112553501B (en) * | 2020-11-27 | 2022-03-25 | 东南大学 | Titanium-niobium shape memory alloy with adjustable negative thermal expansion and preparation method thereof |
| CN112458336B (en) * | 2020-11-27 | 2022-03-29 | 东南大学 | Titanium-niobium-oxygen alloy with negative thermal expansion and preparation method thereof |
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