Cov kws tshawb fawb Hong Kong tsim cov ntawv me me 3D luam ntawv los tsim Super Strong Titanium Alloys
Ib txoj kev tshawb fawb coj los ntawm cov kws tshawb fawb ntawm Lub Nroog University of Hong Kong siv cov khoom siv ntxiv (feem ntau hu ua 3D luam ntawv) kom ua tiav lub zog loj, siab-ductility, thiab super-light titanium-based alloy. Lawv qhov kev tshawb pom tau qhib txoj hauv kev tshiab los tsim cov alloys nrog cov qauv tsis tau pom dua thiab cov khoom siv rau ntau yam kev siv.
3D luam ntawv: ntau tshaj li ib lub tshuab molding
Cov neeg feem coob xav tias 3D luam ntawv yog kev hloov kho thev naus laus zis uas tuaj yeem tsim cov tshuab ua haujlwm nyuaj hauv ib kauj ruam. "Txawm li cas los xij, peb tau nthuav tawm nws lub peev xwm tseem ceeb hauv kev tsim cov ntaub ntawv, tsis yog tsuas yog tsim cov duab geometric. Metallurgists nyiam ntseeg tias qhov tsis muaj qhov sib xws ntawm cov hlau alloy yog qhov tsis xav tau vim tias nws tuaj yeem ua rau cov khoom tsis zoo xws li brittleness. , yuav ua li cas tshem tawm qhov tsis sib xws hauv cov txheej txheem txias ceev yog ib qho ntawm cov teeb meem tseem ceeb.
Tsim ib qho tshwj xeeb microstructure
"Cov yam ntxwv tshwj xeeb ntawm kev tsim khoom ntxiv ua rau peb muaj kev ywj pheej ntau dua hauv kev tsim microstructures," piav qhia Dr. Zhang, uas kuj yog thawj tus kws sau ntawv no. "Tshwj xeeb, peb tau tsim ib feem homogenization txoj kev uas siv 3D luam ntawv thev naus laus zis los tsim cov alloys nrog micron-theem concentration gradients, uas tsis tuaj yeem ua tiav los ntawm kev tsim cov khoom siv ib txwm muaj."
Cov txheej txheem lawv tau npaj muaj xws li siv lub teeb tsom laser kom yaj thiab sib tov ob hom hmoov sib txawv thiab cov hmoov hlau tsis muaj hlau. Los ntawm kev tswj tsis tau xws li laser fais fab thiab scanning ceev thaum lub sij hawm 3D luam ntawv txheej txheem, pab neeg no ua tau zoo nyob rau hauv tsim ib tug non-uniform muaj pes tsawg leeg ntawm cov ntsiab lus nyob rau hauv lub tshiab alloy nyob rau hauv ib tug tswj.
(3D luam daim ntawv qhia zaub mov ntawm titanium alloy)
Xibfwb Liu tau hais tias: Ntxiv rau kev siv cov khoom siv ntxiv, qhov sib xyaw ntawm ob cov hmoov sib tov yog lwm qhov tseem ceeb los tsim kom muaj qhov tsis tau pom dua siab metastable lava zoo li microstructure hauv cov hlau tshiab. Cov microstructures tshwj xeeb no coj cov khoom siv kho tshuab siab tshaj plaws, ua rau cov hlau hnyav heev thiab lub teeb hauv qhov hnyav. Cov txiaj ntsig kev sim qhia tau hais tias cov titanium alloy tshiab muaj cov cuab yeej zoo heev.
Tshiab alloy: 40% sib dua, super zog
Feem ntau hais lus, qhov loj ntawm stainless hlau yog 7.9 grams ib cubic centimeter, thaum lub loj ntawm cov tshiab alloy tsuas yog 4.5 grams ib cubic centimeter, uas yog hais txog 40% sib zog. Hauv lawv cov kev sim, cov titanium alloy nrog cov qauv zoo li lava tau nthuav tawm lub zog tensile siab ntawm ~ 1.3 gigapascal, nrog rau cov elongation zoo li ntawm 9%. Nws kuj muaj peev xwm ua haujlwm zoo tshaj plaws ntawm ntau tshaj 300MPa, uas ua kom muaj kev nyab xeeb loj heev ua ntej tawg, uas yog qhov tseem ceeb heev hauv kev siv cov qauv.
Cov khoom zoo heev no muaj cov qauv siv tau zoo hauv ntau qhov xwm txheej, xws li aerospace, tsheb, tshuaj, thiab kev lag luam kho mob. Raws li thawj pab neeg siv 3D luam ntawv thev naus laus zis los tsim cov hlau tshiab nrog cov qauv microstructure tshwj xeeb thiab cov khoom, peb yuav ntxiv cov tswv yim tsim qauv no rau cov txheej txheem sib txawv thiab tshawb nrhiav lwm yam khoom ntawm cov hlau tshiab.
