Titanium (ti) thiab cov alloys tau txais dav dav nyob rau hauv cov ntawv thov siv tau vim lawv cov khoom tau zoo xws li corrosion tsis kam. Txhawm rau txhim kho cov khoom siv tshuab ntawm kev ua yeeb yam ntawm kev sib tw ntawm kev siv hluav taws xob- titanium alloys, nag ntsis txoj kev muaj zog yog qhov zoo tshaj plaws txoj kev. Los ntawm kev kho qhov loj me, morphology, thiab faib tawm ntawm HCP precipitates nyob rau hauv BCC Matrix, kev tshem tawm cov chaw txav yog tabkaum. Txawm li cas los xij, qhov sib txawv ntawm cov qauv crystal, deformation mechanism, thiab lub zog rau kev ntxhov siab hauv lub zos thiab duction txo rau hauv micrascacks thiab ductility ntawm biphasic titanium alloys.
To address the aforementioned issues, three new strategies have recently been proposed. Firstly, activate various plastic mechanisms of the β phase during the plastic deformation process. For example, the activation sequence of the deformation mechanism of the β matrix from dislocation slip to phase transition is regulated by the precipitation of three functional groups α, thereby enhancing the ductility of the alloy. Secondly, constructing unique heterostructures to alleviate interfacial strain incompatibility, thereby achieving the strain distribution/gradient required for uniform plastic deformation. We have also developed layered structures with multi-scale alpha precipitates in biphasic titanium alloys to reduce stress concentration at the alpha/beta interface and improve ductility Thirdly, utilizing the interstitial O/N elements to refine and strengthen the alpha precipitate, thereby reducing the strength difference between the alpha and beta phases. However, the above three strategies rarely regulate the inherent deformation mechanism of low crystal symmetry alpha precipitates, and the independent slip systems of these precipitates are quite limited. Compared with the reported high-strength duplex titanium alloys (yield strength>1100 MPA), cov no titanium tshiab alloys muaj cov txiaj ntsig lub zog ntau dua 1500 MPa. Txawm li cas los xij, vim tsis muaj kev ua haujlwm tsis txaus ua haujlwm thiab qis dua qub elongation (<3%), these high-strength duplex titanium alloys still provide a balance between strength and ductility. The key to overcoming this dilemma lies in activating multiple plastic mechanisms of the alpha phase to alleviate strain incompatibility between the alpha and beta phases, improve work hardening rate (WHR), and achieve uniform elongation.
Feem ntau hais lus, lub ntsiab ploj mus ib sab hauv alpha precipitates yog prismaticNpleem, raws li nws qhov tseem ceeb daws shear kev ntxhov siab (CSS) yog qhov qis tshaj txhua lub taub hau. Txawm li cas los xij, cia siab ib leeg rau ntawm lub taub hau no tsis yoog rau c- Axis strain, tsis tau nws tuaj yeem ntsib Taylor Von dag ntxias. Yog li ntawd, nws yog ib qho tsim nyog los ua kom muaj pyramid
Qhov kev ntxhov siab no tau tsav HCP rau FCCC theem hloov pauv tau pom nyob rau hauv ZR, HF, thiab ti alloys. Kev tshoov siab los ntawm cov kev tshawb pom saum toj no, hauv kev ua haujlwm no, peb tau tsim muaj cov txheej txheem ntau ntawm cov lej ntawm no (wt} 4.5ZR-1.5ZR-1.5ZR-1.5ZR Cov nyhuv. Los ntawm kev tswj hwm qhov loj me thiab morphology ntawm alpha precipitates, ib peb lub ncov crystalline alpha precipitates tau npaj. Los ntawm kev siv cov nplej loj yog deforment mechanism, SAPM ua haujlwm nyob rau hauv ntau nplai Alpha muaju kom muaj kev hloov pauv. Lub tswv yim no tau ua rau peb peb ncov titanium alloy muaj lub zog siab / kawg tensile lub zog ntawm lub zog tshaj tawm ntawm lub zog ntawm lub zog-lub zog duplex titanium alloys.
Thov cov lus hais
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