Cov kws tshawb fawb tau tshawb xyuas qhov cuam tshuam ntawm alloy muaj pes tsawg leeg ntawm printability thiab solidification ntawm microstructures, kom nkag siab zoo dua li cas alloy muaj pes tsawg leeg, txheej txheem sib txawv, thiab thermodynamics cuam tshuam cov khoom tsim khoom ntxiv. Los ntawm 3D-printing thwmsim, lawv txhais cov alloy chemistry thiab cov txheej txheem tsis yuav tsum tau optimize alloy zog thiab luam superior, zoo tib yam qhov chaw ntawm lub microscale. Siv tshuab kev kawm, lawv tsim ib qho qauv uas tuaj yeem siv nrog txhua hom hlau los pab tiv thaiv kev tsis sib xws.
Ib txoj kev tshiab tsim los ntawm Texas A&M cov kws tshawb fawb tau ua kom zoo dua cov khoom siv hlau thiab cov txheej txheem tsis zoo los tsim cov khoom zoo tshaj 3D-printed hlau. Qhia ntawm no yog cov xim electron micrograph ntawm nickel hmoov alloy siv hauv txoj kev tshawb no. Saib xyuas ntawm Raiyan Seede.
Ib txoj kev tshiab tsim los ntawm Texas A&M cov kws tshawb fawb tau ua kom zoo dua cov khoom siv hlau thiab cov txheej txheem tsis zoo los tsim cov khoom zoo tshaj 3D-printed hlau. Qhia ntawm no yog cov xim electron micrograph ntawm nickel hmoov alloy siv hauv txoj kev tshawb no. Saib xyuas ntawm Raiyan Seede.

Alloy hlau hmoov siv rau kev tsim khoom ntxiv tuaj yeem muaj cov hlau sib xyaw, xws li npib tsib xee, txhuas, thiab magnesium, ntawm qhov sib txawv. Thaum lub sij hawm laser txaj hmoov fusion 3D luam ntawv, cov hmoov no txias sai sai tom qab lawv rhuab los ntawm ib tug laser beam. Cov hlau sib txawv hauv cov hmoov hlau alloy muaj qhov sib txawv ntawm cov cua txias thiab ua kom muaj zog ntawm cov nqi sib txawv. Qhov kev tsis sib haum xeeb no tuaj yeem tsim cov teeb meem microscopic, lossis microsegregation.

"Thaum cov hmoov hlau ua kom txias, cov hlau ib leeg tuaj yeem tso tawm," tus kws tshawb fawb Raiyan Seede tau hais. “Xav txog qhov nchuav ntsev hauv dej. Nws dissolves tam sim ntawd thaum cov ntsev me me, tab sis thaum koj ncuav ntsev ntau, cov ntsev ntau dhau uas tsis yaj pib precipitating tawm li crystals. Hauv qhov tseeb, qhov ntawd yog qhov tshwm sim hauv peb cov hlau alloys thaum lawv txias sai sai tom qab luam ntawv. " Seede tau hais tias qhov teeb meem no tshwm sim raws li cov hnab ntim me me uas muaj qhov sib txawv me ntsis ntawm cov khoom xyaw hlau ntau dua li qhov pom hauv lwm qhov chaw ntawm cov ntawv luam tawm.

Cov kws tshawb fawb tau tshawb xyuas qhov solidification microstructures ntawm plaub binary nickel-based alloys. Hauv kev sim, lawv tau kawm txog lub cev lub cev rau txhua lub alloy ntawm qhov sib txawv ntawm qhov kub thiab txias ntawm qhov sib txawv ntawm lwm cov hlau hauv nickel-based alloy. Siv cov duab qhia ntxaws ntxaws, cov kws tshawb fawb tau txiav txim siab cov tshuaj muaj pes tsawg leeg ntawm txhua cov hlau uas yuav ua rau tsawg kawg microsegregation thaum lub sijhawm tsim khoom ntxiv.

Tom ntej no, cov kws tshawb fawb tau yaj ib qho kev sib tw ntawm cov hmoov hlau hlau ntawm cov chaw sib txawv laser thiab txiav txim siab cov txheej txheem laser hmoov txaj fusion uas yuav xa cov khoom tsis muaj porosity.
Ib daim duab scanning electron microscope ntawm ib lub laser scan cross-section ntawm nickel thiab zinc alloy. Ntawm no, cov theem tsaus nti, npib tsib xee-nplua nuj cuam tshuam cov theem sib zog nrog cov txheej txheem microstructure. Ib qho pore kuj tuaj yeem pom nyob rau hauv lub pas dej ua ke. Saib xyuas ntawm Raiyan Seede.
Ib daim duab scanning electron microscope ntawm ib lub laser scan cross-section ntawm nickel thiab zinc alloy. Tsaus, nickel-nplua nuj theem cuam tshuam cov theem sib zog nrog cov txheej txheem microstructure. Ib qho pore kuj tuaj yeem pom nyob rau hauv lub pas dej ua ke. Saib xyuas ntawm Raiyan Seede.

Cov ntaub ntawv tau txais los ntawm cov duab kos duab, ua ke nrog cov txiaj ntsig los ntawm kev sim ib leeg, muab rau pab pawg nrog kev tshuaj xyuas dav dav ntawm cov teeb tsa laser thiab cov txheej txheem nickel-based alloy uas tuaj yeem ua rau muaj qhov porosity-dawb luam tawm yam tsis muaj microsegregation.

Cov kws tshawb fawb tom ntej tau kawm tshuab-kev kawm qauv los txheeb xyuas cov qauv hauv cov ntaub ntawv kev sim ib leeg thiab cov kab kos duab, los tsim ib qho kev sib npaug rau microsegregation uas tuaj yeem siv nrog txhua yam hlau. Seede tau hais tias qhov sib npaug yog tsim los kwv yees qhov kev sib cais muab cov alloy qhov sib txawv thiab cov khoom siv thiab laser lub zog thiab ceev.

Seede tau hais tias "Peb siv qhov tob tob rau hauv kev txhim kho microstructure ntawm alloys kom muaj kev tswj hwm ntau dua ntawm cov khoom ntawm cov khoom luam tawm zaum kawg ntawm qhov ntsuas zoo dua li ua ntej," Seede tau hais.

Raws li kev siv cov alloys hauv AM nce, yog li yuav muaj teeb meem rau luam ntawv qhov chaw uas ua tau raws li lossis tshaj li cov qauv tsim khoom. Txoj kev tshawb fawb Texas A&M yuav ua rau cov tuam txhab tsim kho kom zoo dua cov khoom siv hluav taws xob thiab cov txheej txheem cov txheej txheem kom cov hlau tuaj yeem tsim tshwj xeeb rau kev tsim khoom ntxiv thiab cov tuam txhab tuaj yeem tswj hwm microstructures hauv zos.

"Peb txoj kev ua kom yooj yim rau kev siv cov alloys sib txawv ntawm cov khoom sib txawv rau kev tsim khoom ntxiv yam tsis muaj kev txhawj xeeb ntawm kev qhia qhov tsis xws luag, txawm tias ntawm microscale," tus xibfwb Ibrahim Karaman tau hais. "Qhov haujlwm no yuav muaj txiaj ntsig zoo rau kev lag luam aerospace, tsheb, thiab kev tiv thaiv kev lag luam uas niaj hnub nrhiav txoj hauv kev zoo dua los tsim cov khoom siv hlau. "

Xibfwb Raymundo Arroyavé thiab tus xibfwb Alaa Elwany, uas tau koom tes nrog Seede thiab Karaman ntawm kev tshawb fawb, tau hais tias cov txheej txheem tuaj yeem hloov kho tau yooj yim los ntawm kev lag luam los tsim kom muaj qhov ruaj khov, tsis muaj qhov tsis xws luag nrog lawv cov alloy ntawm kev xaiv.