CN109837422A - A kind of Ti-3Al-5Mo-4.5V alloy - Google Patents
A kind of Ti-3Al-5Mo-4.5V alloy Download PDFInfo
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- CN109837422A CN109837422A CN201711231058.7A CN201711231058A CN109837422A CN 109837422 A CN109837422 A CN 109837422A CN 201711231058 A CN201711231058 A CN 201711231058A CN 109837422 A CN109837422 A CN 109837422A
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Abstract
In order to improve the hardness of titanium alloy, wearability devises a kind of Ti-3Al-5Mo-4.5V alloy.Use Ti powder, Mo powder and Al-V master alloyed powder for raw material, obtained Ti-3Al-5Mo-4.5V alloy, hardness, densification degree, bending strength is all increased dramatically.Wherein, typical processing hardening and flow softening feature are presented in high temperature deformation for Ti-3Al-5Mo-4.5V alloy, and flow stress improves with strain rate and increased, and improves and reduces with deformation temperature, and deformed tissue is tiny equiaxed structure.The present invention can provide a kind of new production technology to prepare high performance Ti-3Al-5Mo-4.5V alloy.
Description
Technical field
The present invention relates to a kind of powdered metallurgical material more particularly to a kind of Ti-3Al-5Mo-4.5V alloys.
Background technique
Alloy is metal and metal by two or more or nonmetallic synthesized by certain methods has metal
The substance of characteristic.Generally obtained and fusing into uniform liquid and solidification.According to the number of component, binary conjunction can be divided into
Gold, ternary alloy three-partalloy and multicomponent alloy.The structure of composition phase and property play the performance of alloy conclusive in alloy.Together
When, the variation of alloy structure is the relative populations of phase in alloy, the grain size of each phase, the variation of shape and distribution, to alloy
Performance very big influence also occurs.Therefore, using the combination of various elements to form a variety of different alloy phases, using conjunction
Suitable processing can be able to satisfy a variety of different performance requirements.
Titanium is a kind of important structural metal to grow up the 1950s, and titanium alloy is anti-corrosion because having intensity height
The features such as property is good, and heat resistance is high and be widely used in every field.Many countries all recognize the weight of titanium alloy material in the world
The property wanted in succession researchs and develops it, and is applied.
Summary of the invention
The purpose of the invention is to improve the hardness of titanium alloy, wearability devises a kind of Ti-3Al-5Mo-4.5V conjunction
Gold.
The technical solution adopted by the present invention to solve the technical problems is:
The raw material for preparing of Ti-3Al-5Mo-4.5V alloy includes: the Ti powder that average grain diameter is 40 μm, the Mo that average grain diameter is 27 μm
The Al-V master alloyed powder that the equal partial size of powder peace is 69 μm.
The preparation step of Ti-3Al-5Mo-4.5V alloy are as follows: starting powder is weighed by experimental design, ingredient is matched
It is poured into hard alloy ball grinder after good and carries out wet-milling, ball-milling medium is the sintered carbide ball of diameter 8mm, Ball-milling Time 48h.
After ball milling, pellet obtained is dried in vacuo, binder is then added and pelletizes.The powder made is added to ten thousand
Compression moulding can be carried out in testing machine, be subsequently placed into vacuum sintering furnace and be sintered, sintering temperature is 1460 DEG C, soaking time
For 90min.
The detecting step of Ti-3Al-5Mo-4.5V alloy are as follows: object phase composition is analyzed using MAx25 type X-ray diffractometer, gold
Mutually corrosion uses Kroll reagent, and microscopic structure uses Me3 type optical microphotograph sem observation, and object phase composition is sent out using Quan250 type field
Penetrate scanning electron microscope analysis.
The Ti-3Al-5Mo-4.5V alloy, typical processing hardening and flow softening are presented in high temperature deformation
Feature, flow stress improve with strain rate and are increased, and improve and reduce with deformation temperature.
When deforming within the scope of high strain rate unstability, Failure Mechanism occur for the Ti-3Al-5Mo-4.5V alloy
For local rheology and microfissure, the best section that deforms is 800 ~ 930 DEG C, and corresponding deformation mechanism is dynamic recrystallization.
The Ti-3Al-5Mo-4.5V alloy, high temperature rolling can get the Ti-3Al-5Mo-4.5V alloy of high deflection
Bar, deformed tissue are tiny equiaxed structure.
The beneficial effects of the present invention are:
Use Ti powder, Mo powder and Al-V master alloyed powder for raw material, by ingredient, ball milling is dry, it pelletizes, forming, sintering process
It is successfully prepared the Ti-3Al-5Mo-4.5V alloy with excellent mechanical performance.Wherein, sintered alloy is in high temperature deformation
Processing hardening phenomenon can be generated, dynamic recrystallization is realized in deformation process.Obtained Ti-3Al-5Mo-4.5V alloy,
Its hardness, densification degree, bending strength are all increased dramatically.The present invention can be to prepare high performance Ti-3Al-5Mo-
4.5V alloy provides a kind of new production technology.
Specific embodiment
Case study on implementation 1:
The raw material for preparing of Ti-3Al-5Mo-4.5V alloy includes: the Ti powder that average grain diameter is 40 μm, the Mo that average grain diameter is 27 μm
The Al-V master alloyed powder that the equal partial size of powder peace is 69 μm.The preparation step of Ti-3Al-5Mo-4.5V alloy are as follows: by starting powder
It weighs by experimental design, ingredient is poured into after preparing and carries out wet-milling in hard alloy ball grinder, and ball-milling medium is diameter 8mm
Sintered carbide ball, Ball-milling Time 48h.After ball milling, pellet obtained is dried in vacuo, binder is then added
It pelletizes.The powder made is added to and carries out compression moulding in universal testing machine, is subsequently placed into vacuum sintering furnace and is burnt
Knot, sintering temperature are 1460 DEG C, soaking time 90min.The detecting step of Ti-3Al-5Mo-4.5V alloy are as follows: object phase composition
It is analyzed using MAx25 type X-ray diffractometer, etching pit uses Kroll reagent, and microscopic structure uses Me3 type optical microscopy
Observation, object phase composition are analyzed using Quan250 type field emission scanning electron microscope.
Case study on implementation 2:
The alloy is typical lamellar alpha+beta duplex structure, and average colony size is about 80 μm, simultaneously containing 11% or so it is residual
It boxes out gap.Alloy does not occur other object phases mainly by α phase and β phase composition.Impurity content is analysis shows the oxygen content of alloy is about
1%。
Case study on implementation 3:
The deformation performance of the alloy is good, does not occur apparent macroscopic cracking under all deformation conditions.Flow stress is with answering
Variable Rate improves and increases, and increases and reduces with deformation temperature.When deformation temperature is 800 ~ 930 DEG C, at deformation initial stage, rheology
Stress increases with strain rate and is increased rapidly, and processing hardening phenomenon occurs, after reaching peak stress, increases with strain rate, rheology
There is ruckbildung, finally reaches stable state rheology.When temperature is increased to 1000 DEG C, there is lasting processing hardening phenomenon, flows
It is unobvious to become softening behavior.
Case study on implementation 4:
The Rheological Instability of alloy occurs mainly within the scope of high strain rate, and power dissipative shock wave is generally lower in the region.Power
The maximum of dissipative shock wave appears in 700 ~ 830 DEG C of sections, and peak dissipation rate is 51%.The high temperature deformation of alloy at different conditions
The variation of mechanism and the power dissipation factor is closely related, and the corresponding power dissipation rate in dynamic recovery region is 18% ~ 24%, and dynamic is again
The corresponding power dissipation rate in crystal region is 28% ~ 61%.The corresponding deformation mechanism of Rheological Instability includes local plastic flowing, insulation
Shear zone and cracking etc..
Case study on implementation 5:
Deformed microcosmic lamellar structure obviously refines and isometry, and apparent dynamic has occurred under the deformation condition and ties again
Crystalline substance, dynamic recrystallization are the main reason for flow softening occur for alloy.Since deformation temperature is close to β phase transformation when being deformed at 900 DEG C
Point, β phase content is higher in deformed tissue, deforms the microcraking of generation and the defects of local rheology.Titanium alloy it is thermally conductive
Coefficient is small, while under high strain rate, and the adiabatic deformation heat that when hot-working generates not conducted by the sufficient time, generates
Local plastic flow phenomenon.β phase is body-centered cubic structure, possesses more slip systems compared to α phase.β phase is excellent when plastic deformation
First sliding deformation, the pile-up of dislocation of accumulation constantly increase in α/β phase interface with deflection, and phase boundary planar defect is more and more and shape
At micro-crack, under low temperature high strain rate, this phenomenon is become apparent from.Ti-3Al-5Mo-4.5V alloy stablizes deformation section
For 800 ~ 850 DEG C and 850 ~ 1050 DEG C, wherein most preferably deformation section is 850 ~ 930 DEG C.
Case study on implementation 6:
Ti-3Al-5Mo-4.5V alloy can carry out stable plastic deformation under the conditions of 800 ~ 1000 DEG C, since excessive temperature is led
It causes material structure excessively to grow up, reduces the mechanical property of material.The surface of sintered state Ti-3Al-5Mo-4.5V alloy bar material is used
Coarse sandpaper polishing is processed after being inserted in rolling grinding tool in 900 DEG C of heat preservation 10min.By the rolling of 4 passages, different changes are obtained
The titanium alloy rod bar of shape amount, for Surface of Rod Bar without apparent macroscopic cracking, which has good heat under conditions of 900 DEG C
Deformability.Deformation structure is the shaft-like tissue such as apparent, and crystal grain is very tiny, uniformly, about 0.5 μm of average grain size, and
And the defects of without obvious residual porosity.
Case study on implementation 7:
For alloy after deformation, low-angle boundary content is less, based on high-angle boundary, more completely dynamic has occurred and ties again
It is brilliant.β phase content is that 22%, α phase content is 75%.Apparent fiber texture degree is formd in α phase.Apparent silk weaving is formd inside β phase
Structure.The generation of deformation texture makes alloy generate anisotropy, influences the mechanical property of alloy, needs to carry out by subsequent processing
It eliminates.
Claims (4)
- The raw material for preparing of 1.Ti-3Al-5Mo-4.5V alloy includes: the Ti powder that average grain diameter is 40 μm, and average grain diameter is 27 μm The Al-V master alloyed powder that the equal partial size of Mo powder peace is 69 μm.
- 2. Ti-3Al-5Mo-4.5V alloy according to claim 1, it is characterized in that the system of Ti-3Al-5Mo-4.5V alloy Standby step are as follows: by starting powder by experimental design weighing, ingredient, poured into after preparing in hard alloy ball grinder carry out it is wet It grinds, sintered carbide ball of the ball-milling medium for diameter 8mm, Ball-milling Time 48h, after ball milling, pellet obtained is carried out true Sky is dry, and binder is then added and pelletizes, the powder made is added to and carries out compression moulding in universal testing machine, is then put Enter in vacuum sintering furnace and be sintered, sintering temperature is 1460 DEG C, soaking time 90min.
- 3. Ti-3Al-5Mo-4.5V alloy according to claim 1, it is characterized in that the inspection of Ti-3Al-5Mo-4.5V alloy Survey step are as follows: object phase composition is analyzed using MAx25 type X-ray diffractometer, and etching pit uses Kroll reagent, and microscopic structure is adopted With Me3 type optical microphotograph sem observation, object phase composition is analyzed using Quan250 type field emission scanning electron microscope.
- 4. Ti-3Al-5Mo-4.5V alloy according to claim 1, it is characterized in that the Ti-3Al-5Mo-4.5V is closed Gold, typical processing hardening and flow softening feature are presented in high temperature deformation, and flow stress improves with strain rate and increased Greatly, it improves and reduces with deformation temperature, the Ti-3Al-5Mo-4.5V alloy, when being deformed within the scope of high strain rate Unstability occurs, Failure Mechanism is local rheology and microfissure, and the best section that deforms is 800 ~ 930 DEG C, corresponding deformation mechanism For dynamic recrystallization, the Ti-3Al-5Mo-4.5V alloy, high temperature rolling can get the Ti-3Al-5Mo- of high deflection 4.5V alloy bar material, deformed tissue are tiny equiaxed structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711231058.7A CN109837422A (en) | 2017-11-29 | 2017-11-29 | A kind of Ti-3Al-5Mo-4.5V alloy |
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| CN201711231058.7A CN109837422A (en) | 2017-11-29 | 2017-11-29 | A kind of Ti-3Al-5Mo-4.5V alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113604757A (en) * | 2021-07-21 | 2021-11-05 | 中南大学 | Ultrahigh-strength heterostructure titanium alloy and preparation method thereof |
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2017
- 2017-11-29 CN CN201711231058.7A patent/CN109837422A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113604757A (en) * | 2021-07-21 | 2021-11-05 | 中南大学 | Ultrahigh-strength heterostructure titanium alloy and preparation method thereof |
| CN113604757B (en) * | 2021-07-21 | 2022-01-25 | 中南大学 | Ultrahigh-strength heterostructure titanium alloy and preparation method thereof |
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