CN112981179A - Nickel-titanium shape memory alloy material, alloy wire material, and preparation method and application thereof - Google Patents
Nickel-titanium shape memory alloy material, alloy wire material, and preparation method and application thereof Download PDFInfo
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- CN112981179A CN112981179A CN202110168284.5A CN202110168284A CN112981179A CN 112981179 A CN112981179 A CN 112981179A CN 202110168284 A CN202110168284 A CN 202110168284A CN 112981179 A CN112981179 A CN 112981179A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/023—Alloys based on nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
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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
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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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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Abstract
The invention discloses a nickel-titanium shape memory alloy material, an alloy wire material, and a preparation method and application thereof, and relates to the technical field of alloy preparation. The preparation method of the nickel-titanium shape memory alloy material comprises the following steps: and casting and cooling the melted nickel-titanium alloy melt under mechanical vibration to obtain an ingot, wherein the mechanical vibration frequency is 45-55 Hz, and the amplitude is 12-20 cm. The nickel-titanium shape memory alloy material is prepared by the preparation method provided by the embodiment of the invention. The preparation method of the nickel-titanium shape memory alloy wire comprises the step of drawing and forming the nickel-titanium shape memory alloy material or the memory alloy material prepared by the preparation method of the alloy material provided by the invention. The nickel-titanium shape memory alloy wire is prepared by the preparation method provided by the embodiment of the invention. The alloy material and the alloy wire prepared by the preparation method provided by the invention have good mechanical properties, and can be widely applied to the field of medical instruments.
Description
Technical Field
The invention relates to the technical field of alloy preparation, in particular to a nickel-titanium shape memory alloy material, an alloy wire material, and a preparation method and application thereof.
Background
The nickel-titanium memory shape alloy has the advantages of good biocompatibility, high shape memory recovery rate, superelasticity, high strength, fatigue resistance, wear resistance, radiopacity, nuclear magnetic resonance non-influence and the like, and is widely researched and applied in the fields of medical instruments, aerospace, spectacle frames and the like. Particularly in the field of medical appliances, due to the limitations of the deformability and elastic range of stainless steel, the nickel-titanium memory shape alloy has gradually replaced medical stainless steel and is widely applied in large-sized lumens such as carotid artery, biliary tract and esophagus, but in the clinical use process, the phenomenon of fatigue fracture of the stent prepared by adopting the nickel-titanium memory shape alloy wire is found, and the health of a patient is seriously affected. Therefore, the preparation technical research of the biomedical nickel-titanium memory shape alloy wire is developed, the fatigue resistance of the nickel-titanium memory shape alloy wire for the stent is further improved, and the method has important significance for ensuring the safety of the nickel-titanium memory shape alloy stent product and prolonging the service life of the nickel-titanium memory shape alloy stent product.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a nickel-titanium shape memory alloy material, an alloy wire material, and a preparation method and application thereof.
The invention is realized by the following steps:
in a first aspect, an embodiment of the present invention provides a method for preparing a nickel-titanium shape memory alloy material, including:
casting and cooling the melted nickel-titanium alloy melt under mechanical vibration to obtain an ingot, wherein the mechanical vibration frequency is 45-55 Hz, and the amplitude is 12-20 cm;
and hot forging and rolling the cast ingot.
In an alternative embodiment, the casting and cooling to obtain the ingot further comprises: the nickel-titanium alloy melt is obtained by smelting nickel-titanium alloy preparation raw materials in vacuum, wherein the vacuum degree during smelting is 0.01-0.1 Pa, and the smelting temperature is 1900-2200 ℃.
In an alternative embodiment, the hot forging is to forge the ingot into a bar at a temperature of 950-1000 ℃ and a forging speed of 5-10 mm/s.
In an alternative embodiment, the rolling is to roll the bar obtained by hot forging at the temperature of 850-900 ℃ and the hot rolling speed of 2500-3000 mm/s to obtain the bar.
In a second aspect, the embodiment of the present invention provides a nickel titanium shape memory alloy material, which is prepared by the preparation method provided by the embodiment of the present invention.
In a third aspect, the embodiment of the invention provides a preparation method of a nickel-titanium shape memory alloy wire, which comprises the steps of drawing and forming the nickel-titanium shape memory alloy material provided by the embodiment of the invention;
in an optional embodiment, the drawing forming is to draw the rolled bar at room temperature, wherein the intermediate annealing temperature is 700-760 ℃, the temperature is kept for 30-60 minutes, and the intermediate annealing times are 5-10.
In a fourth aspect, the embodiment of the invention provides a nickel-titanium shape memory alloy wire material, which is prepared by the preparation method provided by the embodiment of the invention.
In a fifth aspect, an embodiment of the present invention provides a method for preparing a nickel titanium shape memory alloy wire, including:
the nickel-titanium shape memory alloy material is prepared according to the preparation method provided by the embodiment of the invention;
drawing and forming the nickel-titanium shape memory alloy material.
In an optional embodiment, the drawing forming is to draw the rolled bar at room temperature, wherein the intermediate annealing temperature is 700-760 ℃, the temperature is kept for 30-60 minutes, and the intermediate annealing times are 5-10.
In a sixth aspect, embodiments of the present invention provide applications of the nickel titanium shape memory alloy material in the field of medical devices.
The invention has the following beneficial effects:
because the casting and cooling processes are carried out under the condition of proper mechanical vibration, the fluidity of the alloy melt can be improved, the dendritic crystal can be cut off, the feeding channel can be expanded, the feeding capacity of the molten metal can be enhanced, and particularly, the mechanical vibration is favorable for refining grains and improving the mechanical property of the alloy. For the nickel-titanium shape memory alloy, the nickel-titanium shape memory alloy vibrates under the conditions that the frequency is 45-55 Hz and the amplitude is 12-20 cm, and the performance of the nickel-titanium shape memory alloy can be obviously improved. The nickel-titanium shape memory alloy cast ingot prepared by the preparation method provided by the invention can effectively avoid the defects of impurities, shrinkage cavities and the like, the processing performance of the prepared alloy material and alloy wire is improved, the obtained wire has uniform and fine tissue, and the fatigue resistance of the nickel-titanium shape memory alloy is favorably improved. The material prepared by the invention can be widely applied to the field of medical appliances.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The nickel-titanium shape memory alloy material, the alloy wire material, the preparation method and the application thereof provided by the invention are specifically explained below.
The invention provides a preparation method of a nickel-titanium shape memory alloy material, which comprises the following steps:
and casting and cooling the melted nickel-titanium alloy melt under mechanical vibration to obtain an ingot, wherein the mechanical vibration frequency is 45-55 Hz, and the amplitude is 12-20 cm.
And carrying out hot forging and rolling on the cast ingot.
The mechanical vibration is utilized in the casting and cooling processes to improve the fluidity of the alloy melt, which is beneficial to cutting off dendrites, expanding feeding channels and enhancing the feeding capacity of molten metal, and particularly the mechanical vibration is beneficial to refining grains and improving the mechanical property of the alloy. For the nickel-titanium shape memory alloy, the nickel-titanium shape memory alloy can be vibrated under the conditions that the frequency is 45-55 Hz and the amplitude is 12-20 cm, so that the performance of the nickel-titanium shape memory alloy can be obviously improved. The nickel-titanium shape memory alloy wire cast ingot prepared by the preparation method provided by the embodiment of the application can effectively avoid the defects of impurities, shrinkage cavities and the like, the processing performance of the material is improved, the obtained wire is uniform and fine in tissue, and the fatigue resistance of the nickel-titanium shape memory alloy is favorably improved. The material prepared by the invention can be widely applied to the field of medical appliances.
Specifically, the preparation method comprises the following steps:
s1, smelting
The nickel-titanium shape memory alloy is smelted under the vacuum condition, the vacuum degree is 0.01-0.1 Pa, and the smelting temperature is 1900-2200 ℃ to obtain an alloy melt.
S2, casting and cooling
And pouring the alloy melt into a mold, fixing the mold on a vibration table with the frequency of 45-55 Hz and the amplitude of 12-20 cm, and cooling along with the furnace to obtain an alloy ingot.
S3, hot forging
And forging the cast ingot at 950-1000 ℃ to form a bar, wherein the forging speed is 5-10 mm/s to obtain the bar.
The forging is carried out at the temperature and the forging speed, so that the prepared alloy material has uniform structure and further refined grains.
S4 rolling
And rolling the bar material obtained by hot forging at the temperature of 850-900 ℃ and the hot rolling speed of 2500-3000 mm/s to obtain the bar material.
Rolling at the above temperature and rolling speed can ensure the uniform structure of the alloy material and further refine the grains.
The nickel-titanium shape memory alloy material provided by the embodiment of the invention is prepared by adopting the preparation method provided by the embodiment of the invention. Therefore, the alloy material has better mechanical property.
The preparation method of the nickel-titanium shape memory alloy wire material provided by the embodiment of the invention comprises the steps of drawing and forming the nickel-titanium shape memory alloy material provided by the embodiment of the invention;
or the nickel-titanium shape memory alloy material is prepared according to the preparation method provided by the embodiment of the invention;
and then drawing and forming the nickel-titanium shape memory alloy material.
Preferably, the drawing forming is to draw the rolled bar at room temperature, the intermediate annealing temperature is 700-760 ℃, the temperature is kept for 30-60 minutes, and the intermediate annealing times are 5-10.
The nickel-titanium shape memory alloy wire with better mechanical property can be obtained by drawing under the annealing condition.
The nickel-titanium shape memory alloy wire material provided by the embodiment of the invention is prepared by adopting the preparation method provided by the invention. The wire has good mechanical property and is very suitable for the field of medical instruments.
The embodiment of the invention also provides application of the nickel-titanium shape memory alloy material in the field of medical instruments.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The embodiment provides a preparation method of a nickel-titanium shape memory alloy wire, which specifically comprises the following steps:
1) melting the nickel-titanium shape memory alloy with nearly equal atomic ratio under the vacuum condition, wherein the vacuum degree is 0.01Pa, the melting temperature is 1900 ℃, and casting and cooling are carried out under the mechanical vibration: pouring the nickel-titanium shape memory alloy melt into a mold, fixing the mold on a vibration table with the frequency of 45Hz and the amplitude of 20cm, and cooling along with a furnace to obtain an alloy ingot;
2) hot forging: forging the alloy cast ingot at 950 ℃ to form a bar, wherein the forging speed is 5 mm/s;
3) hot rolling: rolling the nickel-titanium shape memory alloy bar at the temperature of 850 ℃ and the hot rolling speed of 2500 mm/s;
4) drawing: drawing the nickel-titanium shape memory alloy bar at room temperature, wherein the intermediate annealing temperature is 760 ℃, keeping the temperature for 60 minutes, and the intermediate annealing times are 5 times, so as to obtain the nickel-titanium shape memory alloy wire with the diameter size of 3.5 mm.
Example 2
The embodiment provides a preparation method of a nickel-titanium shape memory alloy wire, which specifically comprises the following steps:
1) melting the nickel-titanium shape memory alloy with nearly equal atomic ratio under the vacuum condition, wherein the vacuum degree is 0.05Pa, the melting temperature is 2000 ℃, casting and cooling under mechanical vibration: pouring the nickel-titanium shape memory alloy melt into a mold, fixing the mold on a vibration table with the frequency of 55Hz and the amplitude of 12cm, and cooling along with a furnace to obtain an alloy ingot;
2) hot forging: forging the alloy ingot at 980 ℃ to form a bar, wherein the forging speed is 8 mm/s;
3) hot rolling: rolling the nickel-titanium shape memory alloy bar at the temperature of 880 ℃ and the hot rolling speed of 2800 mm/s;
4) drawing: drawing the nickel-titanium shape memory alloy bar at room temperature, wherein the intermediate annealing temperature is 730 ℃, keeping the temperature for 45 minutes, and the intermediate annealing times are 8 times, so as to obtain the nickel-titanium shape memory alloy wire with the diameter size of 2.5 mm.
Example 3
The embodiment provides a preparation method of a nickel-titanium shape memory alloy wire, which specifically comprises the following steps:
1) melting the nickel-titanium shape memory alloy with nearly equal atomic ratio under the vacuum condition, wherein the vacuum degree is 0.1Pa, the melting temperature is 2200 ℃, casting and cooling under mechanical vibration: pouring the nickel-titanium shape memory alloy melt into a mold, fixing the mold on a vibration table with the frequency of 50Hz and the amplitude of 15cm, and cooling along with a furnace to obtain an alloy ingot;
2) hot forging: forging the alloy cast ingot at 1000 ℃ to form a bar, wherein the forging speed is 10 mm/s;
3) hot rolling: rolling the nickel-titanium shape memory alloy bar at the temperature of 900 ℃ and the hot rolling speed of 3000 mm/s;
4) drawing: drawing the nickel-titanium shape memory alloy bar at room temperature, wherein the intermediate annealing temperature is 700 ℃, the temperature is kept for 30 minutes, and the intermediate annealing times are 10 times, so as to obtain the nickel-titanium shape memory alloy wire with the diameter size of 1.0 mm.
Example 4
This embodiment is substantially the same as embodiment 1 except that: the interannealing temperature was 650 ℃.
Example 5
This embodiment is substantially the same as embodiment 1 except that: the interannealing temperature is 800 ℃.
Example 6
This embodiment is substantially the same as embodiment 1 except that: the intermediate annealing heat preservation time is 20 min.
Example 7
This embodiment is substantially the same as embodiment 1 except that: the number of intermediate anneals was 3.
Comparative example 1
This comparative example is essentially the same as example 1 except that: the vibration frequency was 70 Hz.
Comparative example 2
This comparative example is essentially the same as example 1 except that: the vibration frequency was 30 Hz.
Comparative example 3
This comparative example is essentially the same as example 1 except that: the amplitude was 8 cm.
Comparative example 4
This comparative example is essentially the same as example 1 except that: the amplitude was 25 cm.
Examples of the experiments
The tensile strength and elongation of the nickel titanium shape memory alloy wire prepared by the preparation methods provided in examples 1 to 7 and comparative examples 1 to 4 were tested, and the results are reported in table 1. The test method is carried out according to the national standard GB/T228.1-2010.
TABLE 1 tensile Strength (MPa) and elongation (%)
The experimental results in the table show that the preparation method of the nickel-titanium shape memory alloy material provided by the embodiment of the invention can prepare the alloy material with good mechanical property. Comparing comparative examples 1-4 with example 1, it was found that the mechanical properties of the wires of comparative examples 1-4 were significantly inferior to example 1, indicating that the mechanical properties of the titanium shape memory alloy material could be significantly improved when cast and cooled under suitable vibration conditions. Comparing examples 4-7 with example 1, it was found that the mechanical properties of the wires obtained in examples 4-7 were inferior to those of example 1, indicating that the mechanical properties of the wires could be further improved when the drawing process was under the preferred processing conditions for this application.
In conclusion, the preparation method of the nickel-titanium shape memory alloy material and the alloy wire provided by the invention has the advantages that the casting and cooling processes are carried out under the proper mechanical vibration condition, so that the fluidity of the alloy melt can be improved, the dendritic crystal can be cut off, the feeding channel can be expanded, the feeding capacity of molten metal can be enhanced, the grain refinement can be facilitated by the mechanical vibration, and the mechanical property of the alloy can be improved. For the nickel-titanium shape memory alloy, the nickel-titanium shape memory alloy vibrates under the conditions that the frequency is 45-55 Hz and the amplitude is 12-20 cm, and the performance of the nickel-titanium shape memory alloy can be obviously improved. The nickel-titanium shape memory alloy cast ingot prepared by the preparation method provided by the invention can effectively avoid the defects of impurities, shrinkage cavity and the like, the processing performance of the prepared alloy material and alloy wire is improved, the obtained wire has uniform and fine tissue, the fatigue resistance of the nickel-titanium shape memory alloy is favorably improved, and the prepared material can be widely applied to the field of medical instruments.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A preparation method of a nickel-titanium shape memory alloy material is characterized by comprising the following steps:
casting and cooling the melted nickel-titanium alloy melt under mechanical vibration to obtain an ingot, wherein the mechanical vibration frequency is 45-55 Hz, and the amplitude is 12-20 cm;
and carrying out hot forging and rolling on the cast ingot.
2. The method of claim 1, wherein casting and cooling to form the ingot further comprises: the nickel-titanium alloy melt is obtained by smelting nickel-titanium alloy preparation raw materials in vacuum, wherein the vacuum degree during smelting is 0.01-0.1 Pa, and the smelting temperature is 1900-2200 ℃.
3. The method for preparing the nickel titanium shape memory alloy material according to claim 1, wherein the hot forging is to forge the ingot into a bar at a temperature of 950-1000 ℃ and a forging speed of 5-10 mm/s.
4. The method for preparing a shape memory alloy material of nickel titanium as claimed in claim 1, wherein the rolling is performed by rolling the bar obtained by hot forging at a temperature of 850 to 900 ℃ and a hot rolling speed of 2500 to 3000 mm/s.
5. A shape memory nickel titanium alloy material produced by the method of any one of claims 1 to 4.
6. A preparation method of a nickel-titanium shape memory alloy wire is characterized by comprising the following steps: drawing the shape memory nickel titanium alloy material of claim 5.
7. The method for preparing the nickel-titanium shape memory alloy wire material according to claim 6, wherein the drawing forming is to draw the rolled bar material at room temperature, the intermediate annealing temperature is 700-760 ℃, the temperature is kept for 30-60 minutes, and the number of the intermediate annealing is 5-10.
8. A nickel titanium shape memory alloy wire produced by the method of claim 7.
9. A preparation method of a nickel-titanium shape memory alloy wire is characterized by comprising the following steps:
the nickel titanium shape memory alloy material prepared according to the preparation method of any one of claims 1 to 4;
drawing and forming the nickel-titanium shape memory alloy material;
preferably, the drawing forming is to draw the rolled bar at room temperature, the intermediate annealing temperature is 700-760 ℃, the temperature is kept for 30-60 minutes, and the intermediate annealing times are 5-10.
10. Use of the nickel titanium shape memory alloy material of claim 8 in the field of medical devices.
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Cited By (2)
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| CN116274895A (en) * | 2023-03-23 | 2023-06-23 | 陕西天成航空材料有限公司 | Preparation method of titanium alloy cast ingot with uniform components |
| CN117778801A (en) * | 2024-02-26 | 2024-03-29 | 山东瑞安泰医疗技术有限公司 | Degradable copper-based shape memory alloy medical implant and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116274895A (en) * | 2023-03-23 | 2023-06-23 | 陕西天成航空材料有限公司 | Preparation method of titanium alloy cast ingot with uniform components |
| CN116274895B (en) * | 2023-03-23 | 2023-11-07 | 陕西天成航空材料有限公司 | Preparation method of titanium alloy cast ingot with uniform components |
| CN117778801A (en) * | 2024-02-26 | 2024-03-29 | 山东瑞安泰医疗技术有限公司 | Degradable copper-based shape memory alloy medical implant and preparation method thereof |
| CN117778801B (en) * | 2024-02-26 | 2024-05-24 | 山东瑞安泰医疗技术有限公司 | Degradable copper-based shape memory alloy medical implant and preparation method thereof |
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