CN1142305C - High temperature high performance high-niobium titanium-aluminium alloy - Google Patents
High temperature high performance high-niobium titanium-aluminium alloy Download PDFInfo
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- CN1142305C CN1142305C CNB011346299A CN01134629A CN1142305C CN 1142305 C CN1142305 C CN 1142305C CN B011346299 A CNB011346299 A CN B011346299A CN 01134629 A CN01134629 A CN 01134629A CN 1142305 C CN1142305 C CN 1142305C
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Abstract
The present invention relates to a high-Nb Ti-Al alloy which is composed of Ti, Al, Nb, C, W and Y. The present invention is characterized in that the atomic percentage of the components is 45 to 46% of Al, 8 to 10% of Nb, 0 to 0.2% of C, 0 to 0.2% of W, 0 to 0.1% of Y and Ti as the rest. The texture of the alloy is composed of a gamma ordered phase and a alpha2 ordered phase, and a complete laminated texture with uniform crystals is obtained from a deforming alloy and a casting alloy. The size of crystal grains is from 100 to 150 mum, and lamella space is from 0.3 to 0.4 mum. The present invention has the advantage that the use temperature of the high-Nb Ti-Al alloy can reach 840 to 900 DEG C.
Description
Technical field
The invention belongs to provides in a kind of high temperature high performance high-niobium titanium-aluminium alloy, belongs to the superalloy technical field.
Background technology
It is the intermetallic compound structure material that development potentiality is arranged most that the TiAl alloy is generally acknowledged.Now having developed the TiAl composition range that roughly is, Ti-45/48Al-0/2M-0/5X-0/2Z (M=Cr, Mn, V, X=Nb, Ta, W, Z=Si, B, C, N), M class alloying element helps plasticity and recrystallize, Nb, Ta are main solution strengthening elements, and a spot of W and Sn also have similar effect, and Si, B, N, C then separate out the second phase Ti
5Si
3, Ti
xAlC etc. play strengthening effect, and B plays the crystal grain thinning effect, but may increase the sheet spacing.Casting alloy has entered practical stage at present, and its typical case's representative is Ti-47/48Al-2Nb-2Cr (a GE company), Ti-47Al-2W-0.5Si (ABB AB) and Ti-45/47Al-2Nb-2Mn+0.8Vol%TiB
2(Howmet).Document C.M.Austin and T.J.Kelly, in Proc.of
Gamma Titanium Aluminides,Ed.Y-W Kim, et al., TMS, 1995,21, the preparation and the performance of general TiAl alloy are provided.Document Y-W.Kim and D.M.Dimiduk,
Structural IntermetallicsEd.M.V.Nathal et al., 1997,531. provide the strengthening mechanism of TiAl alloy.Document provides J.D.H.Paul, F.Appel and R.Wagner, and Acta Meter.46 (1998), 1075, the strengthening mechanism of Nb among the high Nb-TiAl is provided.
At second TiAl alloy international conference report in 1999, the typical performance that has entered the application stage casting alloy saw Table 1 according to U.S. NASA:
Table 1 has entered the typical performance of application stage casting alloy
| Stretching Ti-47Al-2Nb-2Cr (GE) Ti-45Al-2Nb-2Mn+0.8Vol%TiB 2(Howmet) performance (crystal grain 400-600 μ m) (crystal grain 100-150 μ m) |
| σ Y(MPa) 275-380 400-600 σ B(MPa) 360-500 485-720 δ％ 1-3 0.5-1.5 K IC(MPa√m) 22 17 |
At present just Ti-46Al-4Nb-1W is arranged, Alloy K5 (Ti-46.5Al-2Cr-3Nb-0.2W) etc. at the distortion TiAl of researchdevelopment alloy.These alloy at room temperature yield strength levels are at 400-600 MPa after forging and thermal treatment, and unit elongation is about 1-3, have good hot strength at 500-750C.The typical performance of K5 alloy RFL tissue is: σ
Y473 MPa, σ
B557 MPa, δ %1.2.Complete lamellar structure (TMPL) through a kind of special hot mechanical treatment obtains has improved room temperature yield strength σ
Y775 MPa.Recently the K5 alloy is further strengthened with C, Si, B, O, obtains K5SC (0.2Si, 0.1C), KDCBS (0.1 Si, 0.1B, 0.2C), K5S (0.2 Si, 0.15 O) etc.
Foreign study is crossed a kind of high-intensity powder TiAl alloy, and composition is with the GE alloy, very tiny (the sheet spacing is below 0.1 micron) that crystal grain and sheet spacing are done, obtain the intensity of 1000MPa, but its high temperature microstructure stability is not enough.
Deliver in the international conference that the research of high niobium containing titanium aluminium alloy beginning after 90s is opened at home, particularly the introduction of having made system in U.S.'s international conference of 91 years and 92 years secondaries has considerable influence.First international Intermatallic Ti-Al compound alloy chairman U.S. Y-M doctor Kim pointed out in plenary lecture in 95 years: our high niobium Ti Al alloy is development temperature high performance high TiAl alloy research direction " the first ", and to propose this be the work that very is worth carrying out.Specially invite 99 year February the meeting of second international Intermatallic Ti-Al compound alloy to do the high niobium Ti Al alloy special report.Calendar year 2001, U.S.'s researching high-temperature TiAl alloy of formally setting up the project indicated that the TiAl alloy formally is divided into two class, general T iAl alloy and high temperature TiAl alloy, and the latter's use temperature can improve 50-100 ℃.
The domestic TiAl alloy that researchdevelopment is arranged, mostly basically with external general T iAl alloy phase seemingly, what have is slightly different on composition, also this difference of unrooted of its mechanical characteristic all belongs to general T iAl alloy one class.Our high niobium Ti Al alloy of research is to belong to temperature high performance high TiAl alloy one class.Characteristics such as its composition, strength property and oxidation-resistance are different from general T iAl alloy fully, and use temperature has improved 60-100 ℃.Our this research has promoted the researchdevelopment of domestic and international temperature high performance high TiAl alloy.
The objective of the invention is to improve the use temperature of general T iAl alloy, promptly improve general T iAl alloy strength performance and oxidation-resistance, high niobium Ti Al alloy can be used down at 840-900 ℃.
Summary of the invention:
Chemical ingredients of the present invention is Ti-Al-Nb-X, and concrete composition sees Table 2:
This alloy organizing is by γ and α
2Two ordered phases are formed.Thin brilliant complete lamellar structure has best over-all properties.In deforming alloy and casting alloy, can finely obtain thin uniformly brilliant full lamella (FL) tissue, crystal grain (lamella group size) 100-150 μ m, sheet spacing 0.3-0.4 μ m.In addition, can also obtain nearly complete lamellar structure (NFL), bifurcation tissue (DP), nearly γ tissue (NG).
The chemical ingredients of table 2 high niobium Ti Al alloy (atomic fraction, %)
| Element | Ti | Al | Nb | X | ||
| W | C | Y | ||||
| Composition | Other | 45-46 | 8-10 | 0-0.2 | 0-0.2 | 0-0.1 |
C in the wherein elementary composition in the table 2 and the content of Y are not 0 simultaneously.
The invention has the advantages that: the use temperature of high niobium Ti Al alloy can reach 840-900 ℃.
The contrast of the tensile property of high niobium containing titanium aluminium alloy and typical TiAl alloy sees Table 3, and its tensile strength is far above other TiAl alloys, and high niobium Ti Al alloy has significant specific tenacity superiority.
The contrast of the tensile property of table 2 high niobium containing titanium aluminium alloy and typical TiAl alloy
| Alloy | Degree (℃) | YS(MPa) | UTS(MPa) | EL(％) |
| Ti45Al10Nb FFL | 25 | 992 | 1101 | 0.76 |
| 760 | 692 | 839 | 1.86 | |
| 815 | 641 | 803 | 5.71 | |
| 900 | 563 | 738 | 15.9 | |
| Ti46A18.5Nb0.2W FFL | 25 | 828 | 856 | 1.06 |
| 600 | 764 | 837 | 2.24 | |
| 760 | 655 | 795 | 3.56 | |
| 815 | 632 | 743 | 4.14 | |
| 871 | 547 | 664 | 9.4 | |
| K5 alloy RFL/TMPL | 25 | 473 | 557 | 1.2 |
| 600 | 408 | 525 | 1.7 | |
| 800 | 385 | 510 | 8.1 | |
| 900 | 340 | 418 | 19 | |
| GE alloy FL | 25 | 454 | / | 0.5 |
| 760 | 405 | / | 3 | |
| 870 | 350 | / | 19 | |
| XD alloy FL | 25 | 550-590 | 670-720 | 1.5 |
| 600 | 440 | 650 | / | |
| 760 | 415 | 510 | 19 | |
| Ti47Al1.5Cr0.5V2.3Nb，FL | 25 | 508～280 | 588～300 | 1.2～0.5 |
High niobium Ti Al alloy has extraordinary oxidation-resistance.We just point out first on the CORROSION magazine that as far back as 1992 niobium can significantly improve oxidation-resistance, and be composition-oxidation-resistance figure under 900 ℃ of-1200 ℃ of four temperature, point out in the Ti-Al-Nb three component system, alloy component range with best oxidation-resistance can be described as: Al=55-64 at%, Ti/Nb=2-5.They are at 1100 ℃ and 1200 ℃, and 100 hours oxidation weight gain is respectively 1-2mg/cm
2And 2-3mg/cm
2Level.And TiAl is at 1100 ℃, and 100 hours weightening finish has just reached 120mg/cm
2
Embodiment 1 alloying constituent Ti-46Al-8.5Nb-0.2W-0.15C-0.2B (atomic fraction).
This alloy has excellent high-temperature behavior.Table 4 is contrasts of high niobium containing titanium aluminium alloy creep property and other TiAl alloys.The creep speed of high niobium containing titanium aluminium alloy is than low 1～2 order of magnitude of K5 alloy, and creep stress is than the high 40-150 MPa of 4822 (GE) alloy, and use temperature is higher more than 60 ℃ than GKSS and K5 alloy.
The complete lamellar structure creep property contrast of the high niobium alloy of table 4 and other advanced alloy
2 alloying constituent Ti-45Al-10Nb (atomic fraction).
| Alloying constituent | T(℃) | σMPa | ε％ | t(h) | è m(s -1) |
| 46Al8.5Nb- 0.15C0.2B | 760 815 | 142 142 | 0.1 - | 315.4 - | 1.8×10 -10 8.47×10 -9 |
| 47Al2Cr2Nb | 760 | 276 | - | - | 1×10 -8 |
| 48Al2Cr2Nb | 760 | 105 | 0.5 | 800 | 1.11×10 -10 |
| 45Al2Mn2Nb-0.8TiB 2 | 650 | 276 | 0.5 | 143.5 | - |
| 46.5Al2Cr3-Nb0.2W | 760 | 138 | 0.5 | 421 | 2.77×10 -9 |
| 800 | 138 | 0.5 | 23 | 1.05×10 -8 | |
| 48Al2W | 760 | 276 | - | - | 1.97×10 -8 |
| GKSS | 700 | 150 | 1×10 -10 |
The creep property of table 5 Ti-45Al-10Nb (atomic fraction) alloy
| Alloying constituent | Tissue | T(℃)/σ(MPa)/e m(s -1) |
| 45Al10Nb | NL～60μm | 760/210/5.6E-9 815/210/2.788E-7 |
This alloy has excellent high-temperature behavior.Table 5 is high niobium containing titanium aluminium alloy creep properties.
Claims (1)
1, a kind of high niobium containing titanium aluminium alloy, form by Ti, Al, Nb, C, W, Y, it is characterized in that: Al content is 45---46%, Nb content is 8---10%, C content is 0---0.2%, and W content is 0---0.2%, Y content be 0---0.1%, more than is atomic percent, surplus is Ti, and wherein the content of C and Y is not 0 simultaneously; Alloy organizing is by γ and α
2Two ordered phases are formed, and obtain thin brilliant complete lamellar structure uniformly in deforming alloy and casting alloy, crystal grain 100-150 μ m, sheet spacing 0.3-0.4 μ m.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812604A (en) * | 2009-06-09 | 2010-08-25 | 北京科技大学 | Method for improving long-term oxidation resistance of high-niobium titanium-aluminum alloy through adding yttrium at high temperature |
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| CN100363519C (en) * | 2006-01-19 | 2008-01-23 | 北京科技大学 | Fused zinc corrosion resistant intermetallic compound Ti-Al-Nb alloy |
| CN100465309C (en) * | 2006-09-22 | 2009-03-04 | 北京科技大学 | Method for preparing alloy material of high niobium-titanium-aluminum by discharging plasma agglomeration |
| CN100500907C (en) * | 2007-04-02 | 2009-06-17 | 北京科技大学 | Heat treatment process for large size as-cast high-Nb TiAl-base alloy to obtain complete lamellar structure |
| CN101875106B (en) * | 2009-11-20 | 2011-12-28 | 北京科技大学 | Preparation method of directional solidification high-niobium TiAl-base alloy |
| CN102011195B (en) * | 2010-11-23 | 2012-06-06 | 北京科技大学 | Preparation method of directional solidification high-Nb TiAl alloy single crystal |
| CN102430744B (en) * | 2011-12-13 | 2013-08-14 | 河南科技大学 | Casting process of highly-abrasionproof composite lining plate |
| CN103074536A (en) * | 2013-01-31 | 2013-05-01 | 南京理工大学 | Carbon-silicon-tungsten-yttrium lamellar structure high-niobium titanium-aluminum alloy and preparation method thereof |
| CN103572082B (en) * | 2013-11-18 | 2015-08-05 | 北京科技大学 | A kind of high Nb containing TiAl based alloy and preparation method thereof |
| CN103801581B (en) * | 2014-01-24 | 2015-11-11 | 北京科技大学 | A kind of high-niobium TiAl-base alloy preparation of plates method |
| CN103834843B (en) * | 2014-02-28 | 2016-05-18 | 西北工业大学 | A kind of as-cast high-Nb TiAl alloy and improve the method for its alloy structure |
| CN106498323A (en) * | 2016-09-27 | 2017-03-15 | 北京科技大学 | A kind of transitory efficient deforms TiAl alloy heat treatment method |
| CN107699738A (en) * | 2017-09-29 | 2018-02-16 | 成都露思特新材料科技有限公司 | A kind of fine-grained TiAl alloy and preparation method thereof, aero-engine, automobile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101812604A (en) * | 2009-06-09 | 2010-08-25 | 北京科技大学 | Method for improving long-term oxidation resistance of high-niobium titanium-aluminum alloy through adding yttrium at high temperature |
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