CN105039783A - Ti2AlC particle refined gamma-TiAl intermetallic compound material and preparation method thereof - Google Patents
Ti2AlC particle refined gamma-TiAl intermetallic compound material and preparation method thereof Download PDFInfo
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- CN105039783A CN105039783A CN201510534619.5A CN201510534619A CN105039783A CN 105039783 A CN105039783 A CN 105039783A CN 201510534619 A CN201510534619 A CN 201510534619A CN 105039783 A CN105039783 A CN 105039783A
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Abstract
The invention relates to an intermetallic compound material and a preparation method thereof, in particular to a Ti2AlC particle refined gamma-TiAl intermetallic compound material and a preparation method thereof, and aims to solve the technical problems that due to the fact that a violent exothermic reaction happens to monoplasmatic boron and TiAl alloy melt in the melting process, a large number of air holes exist in a cast ingot or casting, and the cost is high. The Ti2AlC particle refined gamma-TiAl intermetallic compound material is composed of Al, Nb, Cr, TiC and the balance Ti. The preparation method comprises the steps that 1, raw materials are weighed; 2, a pressing block is prepared; 3, the melt is prepared; and 4, the melt is cast into a preheated metal mould to form a Ti2AlC particle refined gamma-TiAl intermetallic compound cast ingot, and furnace cooling is carried out. The obtained gamma-TiAl intermetallic compound material is very small in microscopic structure, the size of a lamellar colony is about 100 micrometers, and formed Ti2AlC phases are evenly distributed in the structure. Due to the small and even structure free of obvious segregation, the comprehensive performance of alloy can be improved. The invention belongs to the field of preparation of the intermetallic compound material.
Description
Technical field
The present invention relates to a kind of inter-metallic compound material and preparation method thereof.
Background technology
γ-TiAl-base alloy is a kind of novel high-temperature structural material, there is the advantages such as high-melting-point, low density, high elastic coefficient and good hot strength, fire retardancy, oxidation-resistance, be a kind of heat-resisting high-temperature structural material of novel light with broad prospect of application, be considered to one of aircraft engine structured material of future generation having competition potential.But the as-cast structure that TiAl intermetallic compound is thick and low temperature-room type plasticity limit its widespread use.Recent decades, Chinese scholars has done a large amount of Exploration & stu dy in the structure and properties of TiAl intermetallic compound.Result shows, and by adding a certain amount of alloying element, changes the solidification path of alloy, can the as-cast structure of refinement γ-TiAl.Containing β phase γ-TiAl-base alloy be exactly profit in this way, make alloy by traditional L → L+ β → α by the beta stable element reducing Al content and add q.s ... change L → L+ β → β →... into, obtain tiny as-cast structure.But contain the content of Al element in β phase γ-TiAl-base alloy generally between 43 ~ 45at%, and be applied to the Al content of the γ-TiAl-base alloy of casting in the world between 45 ~ 48at% at present, the solidification path of two kinds of alloys has the difference of essence, therefore this method inapplicable.Investigator finds simultaneously, adding a small amount of pure boron in casting γ-TiAl-base alloy can refining alloy tissue significantly, but because pure boron with TiAl alloy melt, violent thermopositive reaction occurs in fusion process, cause there is a large amount of pores in ingot casting or foundry goods, and its cost intensive.Carbon has the feature similar to boron, and its cost is lower, and is used for carrying heavy alloyed high-temperature creep resistance in γ-TiAl-base alloy of being everlasting.But there is not been reported about the preparation of the γ-TiAl intermetallic compound material of carbide particle refinement and the physical metallurgy behavior of carbide in gamma-TiAl alloy.
Summary of the invention
The object of the invention is in fusion process, with TiAl alloy melt, violent thermopositive reaction to occur in order to solving pure boron, causing there is a large amount of pores in ingot casting or foundry goods, and the technical problem of its cost intensive, provide a kind of Ti
2alC grain refine γ-TiAl intermetallic compound material and preparation method thereof.
Ti
2alC grain refine γ-TiAl intermetallic compound material according to atomicity percentage composition by 46% ~ 48% Al, Nb, the Cr of 2% of 2%, the Ti of the TiC of 0.5 ~ 1% and surplus form.
Ti
2the preparation method of AlC grain refine γ-TiAl intermetallic compound material carries out according to following steps:
One, according to atomicity percentage composition take 46% ~ 48% Al, Nb, the Cr of 2% of 2%, the ratio titanium sponge of the Ti of the TiC of 0.5 ~ 1% and surplus, rafifinal, aluminium niobium master alloy, electrolysis chromium and TiC powder;
Two, step one taken raw material carries out compound stalk forming by metallic briquette machine, obtain briquetting, during briquetting, each layer is respectively sponge titanium layer, high-purity aluminium lamination, aluminium niobium master alloy layer, electrolysis layers of chrome, TiC layer and sponge titanium layer from bottom to top;
Three, the briquetting obtained is put in water jacketed copper crucible induction melting furnace, before melting, metallic mould is preheated to 300 ~ 400 DEG C, water jacketed copper crucible vacuum induction melting furnace is evacuated to 1.0 ~ 3.0 × 10
-3mbar, stop increasing power after monitor system being risen to 85 ~ 90kW with 10 ~ 15kW/min speed, then melting briquetting 300 ~ 360s under firm power, obtains melt;
Four, melt is cast in the metallic mould after preheating, forms Ti
2alC grain refine γ-TiAl intermetallic compound ingot casting, and furnace cooling.
Wherein, the quality purity of titanium sponge is 99.7%, and rafifinal quality purity is 99.99%, and the quality purity of aluminium niobium master alloy is 99.8%, and the quality purity of electrolysis chromium is the quality purity of 99.99%, TiC is 99.99%; Each raw material is commercially available prod.
The present invention determines the optimal addn scope of TiC, and in Material Coagulating Process, what change the adding of TiC alloy solidifies route, by traditional L → L+ β → α ... become L → L+ β → α+Ti
2alC ..., the γ obtained-TiAl intermetallic compound material microstructure is very tiny, synusia group size about 100 μm, the Ti of formation
2alC phase is uniformly distributed in the tissue.Fine uniform, be conducive to without the tissue of obvious segregation the over-all properties improving alloy.
Accompanying drawing explanation
Fig. 1 is Ti prepared by experiment one
2alC grain refine γ-TiAl intermetallic compound scanning of materials electron micrograph;
Fig. 2 is Ti prepared by experiment two
2alC grain refine γ-TiAl intermetallic compound material lamellar microstructure transmission electron microscopy figure;
Fig. 3 is Ti prepared by experiment two
2alC grain refine γ-TiAl intermetallic compound material Ti
2alC particle transmission electron microscopy figure;
Fig. 4 is Ti prepared by experiment two
2the selected diffraction spot figure of carbide in AlC grain refine γ-TiAl intermetallic compound material.
Embodiment
Technical solution of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: Ti described in present embodiment
2alC grain refine γ-TiAl intermetallic compound material according to atomicity percentage composition by 46% ~ 48% Al, Nb, the Cr of 2% of 2%, the Ti of the TiC of 0.5 ~ 1% and surplus form.
Embodiment two: present embodiment and embodiment one are unlike described Ti
2alC grain refine γ-TiAl intermetallic compound material according to atomicity percentage composition by 47% Al, Nb, the Cr of 2% of 2%, the Ti of the TiC of 0.6% and surplus form.Other is identical with embodiment one.
Embodiment three: one of present embodiment and embodiment one or two are unlike described Ti
2alC grain refine γ-TiAl intermetallic compound material according to atomicity percentage composition by 46% Al, Nb, the Cr of 2% of 2%, the Ti of the TiC of 0.7% and surplus form.Other is identical with one of embodiment one or two.
Embodiment four: one of present embodiment and embodiment one to three are unlike described Ti
2alC grain refine γ-TiAl intermetallic compound material according to atomicity percentage composition by 48% Al, Nb, the Cr of 2% of 2%, the Ti of the TiC of 0.8% and surplus form.Other is identical with one of embodiment one to three.
Embodiment five: Ti described in embodiment one
2the preparation method of AlC grain refine γ-TiAl intermetallic compound material, is characterized in that Ti
2the preparation method of AlC grain refine γ-TiAl intermetallic compound material carries out according to following steps:
One, according to atomicity percentage composition take 46% ~ 48% Al, Nb, the Cr of 2% of 2%, the ratio titanium sponge of the Ti of the TiC of 0.5 ~ 1% and surplus, rafifinal, aluminium niobium master alloy, electrolysis chromium and TiC powder;
Two, step one taken raw material carries out compound stalk forming by metallic briquette machine, obtain briquetting, during briquetting, each layer is respectively sponge titanium layer, high-purity aluminium lamination, aluminium niobium master alloy layer, electrolysis layers of chrome, TiC layer and sponge titanium layer from bottom to top;
Three, the briquetting obtained is put in water jacketed copper crucible induction melting furnace, before melting, metallic mould is preheated to 300 ~ 400 DEG C, water jacketed copper crucible vacuum induction melting furnace is evacuated to 1.0 ~ 3.0 × 10
-3mbar, stop increasing power after monitor system being risen to 85 ~ 90kW with 10 ~ 15kW/min speed, then melting briquetting 300 ~ 360s under firm power, obtains melt;
Four, melt is cast in the metallic mould after preheating, forms Ti
2alC grain refine γ-TiAl intermetallic compound ingot casting, and furnace cooling.
Embodiment six: present embodiment and embodiment five unlike in step one according to atomicity percentage composition take 47% Al, Nb, the Cr of 2% of 2%, the Ti of the TiC of 0.6% and surplus.Other is identical with embodiment five.
Embodiment seven: metallic mould is preheated to 350 DEG C unlike before melting in step 3 by present embodiment and embodiment five or six.Other is identical with embodiment five or six.
Embodiment eight: water jacketed copper crucible vacuum induction melting furnace is evacuated to 2.0 × 10 unlike in step 3 by one of present embodiment and embodiment five to seven
-3mbar.Other is identical with one of embodiment one to seven.
Embodiment nine: one of present embodiment and embodiment five to eight stop increasing power after monitor system being risen to 88kW with 12kW/min speed in step 3.Other is identical with one of embodiment one to eight.
Embodiment ten: in the step 3 that present embodiment is different from one of embodiment five to nine, melting briquetting 350s is under firm power.Other is identical with one of embodiment one to nine.
Adopt following experimental verification effect of the present invention:
Experiment one: Ti
2the preparation method of AlC grain refine γ-TiAl intermetallic compound material carries out according to following steps:
One, the titanium sponge of Ti47.5at.%, Al48at.%, Cr2at.%, Nb2at.%, TiC0.5at.%, rafifinal, aluminium niobium master alloy, electrolysis chromium and TiC powder is taken according to atomicity percentage composition;
Two, step one taken raw material carries out compound stalk forming by metallic briquette machine, obtain briquetting, during briquetting, each layer is respectively sponge titanium layer, high-purity aluminium lamination, aluminium niobium master alloy layer, electrolysis layers of chrome, TiC layer and sponge titanium layer from bottom to top;
Three, the briquetting obtained is put in water jacketed copper crucible induction melting furnace, before melting, metallic mould is preheated to 350 DEG C, water jacketed copper crucible vacuum induction melting furnace is evacuated to 1.8 × 10
-3mbar, stop increasing power after monitor system being risen to 85kW with 10kW/min speed, then melting briquetting 300s under firm power, obtains melt;
Four, melt is cast in the metallic mould after preheating, forms Ti
2alC grain refine γ-TiAl intermetallic compound ingot casting, cast ingot dimension is Φ 50 × 60mm, and furnace cooling.
Cut 10 × 10 × 10mm sample from ingot casting, scanned sample is ground to 2000 orders through abrasive paper for metallograph from 60 orders, then throws by electropolisher, essence; Utilize scanning electronic microscope to carry out analysis to find, ingot structure is tiny complete lamellar structure, Ti
2alC particle is uniformly distributed in the tissue, and synusia group mean sizes is 100 μm, sees Fig. 1.
Experiment two: Ti
2the preparation method of AlC grain refine γ-TiAl intermetallic compound material carries out according to following steps:
One, the titanium sponge of Ti48at.%, Al47at.%, Cr2at.%, Nb2at.%, TiC1at.%, rafifinal, aluminium niobium master alloy, electrolysis chromium and TiC powder is taken according to atomicity percentage composition;
Two, step one taken raw material carries out compound stalk forming by metallic briquette machine, obtain briquetting, during briquetting, each layer is respectively sponge titanium layer, high-purity aluminium lamination, aluminium niobium master alloy layer, electrolysis layers of chrome, TiC layer and sponge titanium layer from bottom to top;
Three, the briquetting obtained is put in water jacketed copper crucible induction melting furnace, before melting, metallic mould is preheated to 400 DEG C, water jacketed copper crucible vacuum induction melting furnace is evacuated to 2.0 × 10
-3mbar, stop increasing power after monitor system being risen to 90kW with 10kW/min speed, then melting briquetting 360s under firm power, obtains melt;
Four, melt is cast in the metallic mould after preheating, forms Ti
2alC grain refine γ-TiAl intermetallic compound ingot casting, and furnace cooling.
Adopt electric spark wire cutting method to cut 10 × 10 × 10mm sample from ingot casting, scanned sample is ground to 2000 orders through abrasive paper for metallograph from 60 orders, then throws by electropolisher, essence; Transmission sample is the thin slice of 0.5mm, with sand paper be ground to 60 μm thick, then adopt the preparation of two spray thinning technique.Utilize transmission electron microscope to carry out analysis to find, alloy lamellar spacing is evenly tiny, and average lamellar spacing is 300nm, sees Fig. 2.By carrying out TEM (transmission electron microscope) analysis discovery to carbide, in this alloy, carbide is H type carbide, and nominal composition is Ti
2alC, is shown in Fig. 3 and Fig. 4.
Claims (10)
1.Ti
2alC grain refine γ-TiAl intermetallic compound material, is characterized in that described Ti
2alC grain refine γ-TiAl intermetallic compound material according to atomicity percentage composition by 46% ~ 48% Al, Nb, the Cr of 2% of 2%, the Ti of the TiC of 0.5 ~ 1% and surplus form.
2. Ti according to claim 1
2alC grain refine γ-TiAl intermetallic compound material, is characterized in that described Ti
2alC grain refine γ-TiAl intermetallic compound material according to atomicity percentage composition by 47% Al, Nb, the Cr of 2% of 2%, the Ti of the TiC of 0.6% and surplus form.
3. Ti according to claim 1
2alC grain refine γ-TiAl intermetallic compound material, is characterized in that described Ti
2alC grain refine γ-TiAl intermetallic compound material according to atomicity percentage composition by 46% Al, Nb, the Cr of 2% of 2%, the Ti of the TiC of 0.7% and surplus form.
4. Ti according to claim 1
2alC grain refine γ-TiAl intermetallic compound material, is characterized in that described Ti
2alC grain refine γ-TiAl intermetallic compound material according to atomicity percentage composition by 48% Al, Nb, the Cr of 2% of 2%, the Ti of the TiC of 0.8% and surplus form.
5. Ti described in claim 1
2the preparation method of AlC grain refine γ-TiAl intermetallic compound material, is characterized in that Ti
2the preparation method of AlC grain refine γ-TiAl intermetallic compound material carries out according to following steps:
One, according to atomicity percentage composition take 46% ~ 48% Al, Nb, the Cr of 2% of 2%, the ratio titanium sponge of the Ti of the TiC of 0.5 ~ 1% and surplus, rafifinal, aluminium niobium master alloy, electrolysis chromium and TiC powder;
Two, step one taken raw material carries out compound stalk forming by metallic briquette machine, obtain briquetting, during briquetting, each layer is respectively sponge titanium layer, high-purity aluminium lamination, aluminium niobium master alloy layer, electrolysis layers of chrome, TiC layer and sponge titanium layer from bottom to top;
Three, the briquetting obtained is put in water jacketed copper crucible induction melting furnace, before melting, metallic mould is preheated to 300 ~ 400 DEG C, water jacketed copper crucible vacuum induction melting furnace is evacuated to 1.0 ~ 3.0 × 10
-3mbar, stop increasing power after monitor system being risen to 85 ~ 90kW with 10 ~ 15kW/min speed, then melting briquetting 300 ~ 360s under firm power, obtains melt;
Four, melt is cast in the metallic mould after preheating, forms Ti
2alC grain refine γ-TiAl intermetallic compound ingot casting, and furnace cooling.
6. Ti according to claim 5
2the preparation method of AlC grain refine γ-TiAl intermetallic compound material, it is characterized in that in step one according to atomicity percentage composition take 47% Al, Nb, the Cr of 2% of 2%, the Ti of the TiC of 0.6% and surplus.
7. Ti according to claim 5
2the preparation method of AlC grain refine γ-TiAl intermetallic compound material, is characterized in that before melting, metallic mould being preheated to 350 DEG C in step 3.
8. Ti according to claim 5
2the preparation method of AlC grain refine γ-TiAl intermetallic compound material, is characterized in that, in step 3, water jacketed copper crucible vacuum induction melting furnace is evacuated to 2.0 × 10
-3mbar.
9. Ti according to claim 5
2the preparation method of AlC grain refine γ-TiAl intermetallic compound material, stops increasing power after it is characterized in that with 12kW/min speed, monitor system being risen to 88kW in step 3.
10. Ti according to claim 5
2the preparation method of AlC grain refine γ-TiAl intermetallic compound material, to is characterized in that in step 3 melting briquetting 350s under firm power.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115341115A (en) * | 2021-05-12 | 2022-11-15 | 中国科学院过程工程研究所 | Aluminum-titanium-carbon intermediate alloy refiner and preparation method thereof |
-
2015
- 2015-08-27 CN CN201510534619.5A patent/CN105039783A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| J.DANIEL WHITTENBERGER ET.AL: "Deformation properties of AlTi2C particle containing Ti-46Al-2Cr-2Nb alloys at 1000 to 1200K", 《SCRIPTA METALLURGICA ET MATERIALIA》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115341115A (en) * | 2021-05-12 | 2022-11-15 | 中国科学院过程工程研究所 | Aluminum-titanium-carbon intermediate alloy refiner and preparation method thereof |
| CN115341115B (en) * | 2021-05-12 | 2023-06-02 | 中国科学院过程工程研究所 | Aluminum-titanium-carbon intermediate alloy refiner and preparation method thereof |
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Application publication date: 20151111 |