Piv nrog rau cov khoom loj loj (5-10 μm) titanium alloys, ultrafine grained titanium alloys tsis tsuas yog muaj zog dua thiab zoo sib xws yas, tab sis kuj muaj ntau dua hnav tsis kam thiab zoo biocompatibility. Nws yog qhov txaus nyiam heev hauv ntau daim ntawv thov tseem ceeb xws li aerospace thiab biomedicine. Txawm li cas los xij, kev npaj thiab ua tiav ntawm ultra-nplua-grained titanium alloys yog qhov nyuaj heev, thiab thermal stability ntawm microstructure tsis zoo. Ob qhov teeb meem no txwv tsis pub txoj kev loj hlob thiab kev siv ntawm ultra-nplua-grained titanium alloys.
Pab pawg Yang Ke ntawm lub koom haum ntawm Kev Tshawb Fawb Hlau, Suav Academy ntawm Kev Tshawb Fawb tau ntev tau koom nrog hauv kev tshawb fawb thiab siv cov ntaub ntawv kho mob tshiab. Tsis ntev los no, pab pawg neeg Ren Ling, Wang Hai, thiab lwm yam tau txais lub tswv yim tsim microstructure ntawm "ob-theem plhaub wrapping ultrafine equiaxed crystals" (Daim duab 1), thiab tib lub sijhawm txhim kho microstructure thiab thermal zog ntawm ultrafine grained titanium alloys. los ntawm ob qho tib si thermodynamics thiab kinetics. Nws kuj tseem siv kev sib xyaw ua ke ntawm kev kho cua sov thiab kev ua haujlwm thermal kom paub txog qhov kev npaj loj ntawm cov txheej txheem saum toj no, thiab daws ob qho teeb meem ntawm kev npaj nyuaj thiab ua tiav ntawm ultra-nplua-grained titanium alloys thiab cov qauv tsis zoo, thiab tau txais kev ua tau zoo heev thiab Ultrafine-grained tooj liab-muaj titanium alloy nrog siab thermal stability. Tsis ntev los no, cov txiaj ntsig kev tshawb fawb cuam tshuam tau luam tawm online hauv Nature Communications.
Daim duab 1
Nyob rau hauv xyoo tas los no, pab neeg tshawb fawb tau cog lus rau kev tshawb fawb thiab kev siv cov qauv thiab kev ua haujlwm lom neeg ntawm tooj liab-muaj titanium alloys. Raws li cov kev tshawb fawb yav dhau los, pab pawg tau npaj cov tswv yim npaj "eutectoid element alloying → quenching → kub deformation" (EQD) rau kev npaj ntawm ultra-fine-grained tooj liab-titanium alloys (Fig. 2). Tsim cov tswv yim rau microstructure ntawm axial crystals. Lub tswv yim no ua rau kev tsim cov khoom loj ntawm cov khoom siv ultrafine-grained Ti6Al4V5Cu alloys nrog -Ti grain loj nyob rau hauv thaj tsam ntawm 90-500 nm los ntawm cov khoom siv thermal ua (Fig. 2).
Daim duab 2
Nyob rau tib lub sijhawm, /Ti2Cu dual-theem honeycomb plhaub qauv tsim thaum lub sij hawm thermal deformation yog siv los npog cov nplej, uas ua kom cov thermal stability ntawm ultrafine equiaxed grain qauv thiab ua rau kom qhov kub thiab txias ntawm cov khoom rau 973 K ( { {3}}.55Tm) (Daim duab 3). Chav tsev kub tensile lub zog ntawm ultrafine-grained Ti6Al4V5Cu alloy yog mus txog 1.5 GPa, thiab elongation tshaj 10 feem pua. Ntawm 650 degree thiab strain rate ntawm 0.01 s -1, tensile elongation tshaj 1000 feem pua (Daim duab 1), ua tiav superplastic deformation.
Daim duab 3
Tsis tas li ntawd, lub ultrafine-grained Ti6Al4V-5Cu alloy tsis tau txais cov nplej coarsening thiab loj hlob nyob rau hauv lub thermomechanical coupling mob ntawm kub stretching (Fig. 4). Lub tswv yim EQD no tsis tsuas yog paub txog kev npaj cov kev ua haujlwm siab, siab thermal stability ultrafine grain qauv ntawm lwm cov titanium alloys xws li TiCu thiab TiZrCu, tab sis kuj tau txuas mus rau lwm lub tshuab alloy xws li hlau thiab hlau cov ntaub ntawv rau kev npaj ntawm ultrafine grain hlau cov ntaub ntawv. . Nws muab txoj hauv kev tshiab thiab tseem ceeb heev rau kev tsim thiab kev tshawb fawb ntawm ultrafine-grained metallic cov ntaub ntawv.
Daim duab 4
Cov haujlwm saum toj no tau ua tiav los ntawm pab pawg Yang Ke thiab Ren Ling ntawm Lub Tsev Haujlwm Hlau, pab pawg Qiu Dong ntawm Royal Melbourne Institute of Technology, Australia, thiab pab pawg Chen Xingqiu ntawm Shenyang National Research Center for Materials Science. ntawm lub koom haum ntawm Hlau. Assistant Researcher Wang Hai ntawm lub koom haum ntawm hlau yog thawj tus sau, thiab Renling Project Researcher ntawm lub koom haum ntawm hlau thiab xib fwb Qiu Dong ntawm RMIT University yog tus sau sau.
Hais txog peb & Hu rau
TopTiTech yog cov chaw tsim khoom hauv Suav teb tshwj xeeb hauv kev tsim khoom thiab tsim khoom ntawm titanium ntxeem tau lim ntsiab thiab titanium alloy khoom. Nws tsis tsuas yog muaj nws tus kheej rhiav, tab sis kuj muaj cov cuab yeej siv siab heev thiab cov kws tshaj lij R & D thiab cov kws tshaj lij tsim khoom. Peb cia siab tias yuav muaj lub sijhawm los ua phooj ywg tshiab thiab qub hauv tsev thiab txawv teb chaws. Vam tias tsim kom muaj kev koom tes thiab kev loj hlob.
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