TiAl alloy (titanium-aluminium intermetallic compound) ua lub cim tshiab ntawm lub teeb yuag siab -cov ntaub ntawv kub. Nrog nws qhov tsawg ntom ntom (3.7-4.2 g / cm³, tsawg dua 50% ntawm npib tsib xee-raws li alloys), muaj zog tshwj xeeb, thiab zoo heev - qhov kub thiab txias, nws tau dhau los ua cov khoom tseem ceeb rau kev txo qhov hnyav thiab kev ua tau zoo hauv cov tshuab dav hlau.TiAl alloy pib los ntawm 1950s nws cov volution ntawm qhov kub thiab txias los ntawm 650℃mus tshaj 900 degree. Nws qhia txog qhov tsis muaj peev xwm hloov tau cov tswv yim muaj txiaj ntsig hauv kev txhawb siab siab - rau qhov hnyav piv aerospace lub zog thiab cov khoom kub kawg ntawm cov tsheb supersonic.
1. Lub hauv paus ntawm Kev Sib Sau thiab Cov Qauv Tsim Qauv ntawm TiAl Alloys
1.1 Alloying Strategy and Element FunctionalityTiAl alloy has γ-TiAl phase as the main matrix, achieving a balance of "strength-plasticity-oxidation resistance" through multi-element synergistic regulation:Stable α/β phase elements: Nb (5-10 at.%): Expands the α phase region, increases oxidation resistance temperature (>900 degree), thiab suppresses lub coarsening ntawm siab - kub lamellar qauv. Mo, W (1-3 at.%): Stabilizes theem, txhim khu kev ua haujlwm kub, tab sis ntau dhau tuaj yeem ua rau ₀ theem.TiAl alloy muaj -TiAl theem ua lub ntsiab matrix, ua tiav qhov sib npaug ntawm "lub zog-plasticity-oxidation resistance" los ntawm kev sib koom ua ke ntawm ntau hom:{10} B, C (<0.5 at.%): Refines grains (B) and reduces inter-lamellar spacing (C), enhancing creep resistance. Si, RE (0.1-0.3 at.%): Forms silicide to pin dislocations, and rare earth elements optimize the adhesion of the oxide film.
1.2 Phase Diagram Control and Structure DesignHigh Nb addition (>8 at.%) ho hloov cov theem sib npaug: ₂ / lamellar qauv: Thaum lub interlayer sib nrug yog<0.5μm, crack propagation resistance is increased by 40%;β phase control: Mo/Nb suppress the β→ω transformation, avoiding brittle fracture;Multiphase synergy: TiB whiskers (20-50nm) and Ti₂AlC nanosheets form a three-dimensional reinforcement network, achieving dual strengthening with "solid solution interfaces."
2. Cov yam ntxwv ua tau zoo thiab kev ua kom muaj zog ntawm TiAl Alloys
2.1 Mechanical Performance Advantages of TiAl Alloys High -Tsub Muaj Zog: Tensile lub zog ntawm 800℃Ntau dua los yog sib npaug rau 591 MPa (multiphase reinforced type), nce 18.7% piv rau cov tsoos alloys; Creep Resistance: Steady-state creep rate ntawm 800℃/200 MPa Tsawg dua lossis sib npaug li 3 × 10⁻⁹ s⁻¹ (carbon-silicon microalloyed TNM alloy); Kev ua haujlwm qaug zog: Siab- lub voj voog qaug zog txwv ntawm cov qauv kev taw qhia txog kev sib tw nce mus txog 350 MPa (10⁷ cycles), nrog rau kev loj hlob tawg tau txo los ntawm 27%.
2.2 Lub raj mis thiab tawg hauv ib puag ncig kev tiv thaiv ntawm TiAl Alloys Oxidation Resistance: High Nb alloy (Ti-45Al-8.5Nb) muaj oxidation tus nqi ntawm<0.05 g/(m²·h) at 900°C, approaching that of nickel-based alloys; ZrCrY coatings extend the cyclic oxidation life at 1000°C by 2.3 times. Hot Corrosion Protection: The surface Al₂O₃-Cr₂O₃ composite oxide film effectively blocks sulfur diffusion, with a corrosion rate in molten salt environments of <0.1 mm/year.
3. Daim ntawv thov teb ntawm TiAl
3.1Alloys Aerospace Engines: Tsawg- siab turbine hniav, txo qhov hnyav ntawm ib chav tsev los ntawm 800 phaus, nrog rau kev txhim kho lifespan ntawm 20% tom qab 5000 teev ntawm kev sim.
3.2Automotive Kev Lag Luam: Turbocharger rotors, txo rotor inertia los ntawm 60%, txo lub sijhawm pib los ntawm 30%, thiab nce kev sib hloov ceev los ntawm 15%.
3.3Aerospace Equipment: Ua ntej ntawm cov tsheb hypersonic, nrog lub thermal tiv thaiv qhov hnyav txo ntawm 40% thiab tiv thaiv luv luv -lub sij hawm thermal shock ntawm 1600℃.
3.4 Cov Khoom Siv Hluav Taws Xob: Cov lus qhia roj turbine, nrog qhov hnyav ntawm 50% piv rau npib tsib xee-raws li alloys, thiab tus nqi corrosion nyob rau hauv sulfur- muaj roj tsuas yog 60% ntawm K465 alloy.
4. Cov ntsiab lus
TiAl alloys, ua tsaug rau lawv cov kev pab cuam lub teeb yuag thiab txuas ntxiv txhim kho siab - qhov kub thiab txias, tau hloov los ntawm lub chaw soj nstuam mus rau qib siab - cov khoom siv kawg xws li aerospace cav hniav thiab lub tsheb supersonic ua ntej. Los ntawm kev siv thev naus laus zis xws li siab Nb alloying, ntau-theem kev tsim kho, thiab lub tshuab nqus tsev supergravity casting, keeb kwm kev nyuaj xws li chav kub brittleness, siab - kub oxidation, thiab grain coarsening tau maj mam kov yeej. Kev ua tiav yav tom ntej yuav tsum tau tsom mus rau kev txhim kho cov ductility hauv kev tsim khoom ntxiv, txhim kho kev ruaj ntseg hauv qhov chaw huab cua, thiab ua kom muaj kev tsim ntsuab thoob plaws hauv lub neej kom ua tau raws li qhov xav tau ntawm cov tiam tshiab ntawm aerospace engines (thrust-to- luj ratio> 15) thiab reusable spacecraft. Nrog rau kev sib koom ua ke ntawm ntau- nplai kev sib koom ua ke ntawm cov khoom sib xyaw, txheej txheem, thiab cov qauv, TiAl alloys xav kom ua tiav 20% hloov daim ntawv thov rau aerospace cav Cheebtsam nyob rau xyoo tom ntej, dhau los ua 'cov khoom siv tswv yim ace' hauv kev sib tw toj roob hauv pes siab - cov khoom siv kawg rau cov teb chaws loj.
5.Cov ntaub ntawv tuam txhab
Shaanxi Aerospace Nonferrous Metals Processing Co., Ltd. nyob rau hauv Suav teb muaj 3,500-tuj ceev forging chav tsev imported los ntawm HBE tuam txhab nyob rau hauv South Kauslim, muaj peev xwm ntau lawm ntawm 3,000 tons rau titanium thiab titanium alloy tuav, forgings, thiab daim hlau. Peb muab titanium alloy raw cov ntaub ntawv thiab kev pabcuam rau cov neeg siv khoom thoob ntiaj teb thiab txais tos kev sib tham txog kev koom tes.
