Thawj 3D-printed High-performance Nanostructured Alloy Combines Ultra-lub zog thiab Ductility

Ib pab neeg ntawm cov kws tshawb fawb muaj 3D luam tawm dual-theem nanostructured high-entropy alloy uas tshaj lwm cov khoom siv hauv lub xeev-of-the-art additive manufacturing khoom nyob rau hauv lub zog thiab ductility. Qhov kev tawg no tuaj yeem ua rau muaj kev ua tau zoo dua rau cov ntawv thov hauv aerospace, tshuaj, lub zog thiab kev thauj mus los. Txoj haujlwm tau ua los ntawm cov kws tshawb fawb ntawm University of Massachusetts Amherst thiab Georgia Tech. Coj los ntawm Wen Chen, tus kws tshaj lij ntawm kev siv tshuab thiab kev lag luam engineering ntawm UMass Amherst, thiab Ting Zhu, tus xibfwb ntawm kev tsim kho tshuab ntawm Georgia Tech, nws tau luam tawm Lub Yim Hli 3 hauv phau ntawv journal Nature.

Nyob rau hauv 15 xyoo dhau los, high-entropy alloys (HEAs) tau loj hlob nyob rau hauv muaj koob meej raws li ib tug tshiab paradigm nyob rau hauv cov ntaub ntawv science. Lawv yog tsim los ntawm tsib los yog ntau lub ntsiab lus nyob rau hauv sib npaug zos proportions, muab hlau alloy tsim muaj peev xwm los tsim ze li txwv tsis pub sib xyaw ua ke. Cov khoom siv niaj hnub, xws li tooj dag, stainless hlau, carbon steel thiab bronze, muaj kev sib xyaw ua ke ntawm ib lub ntsiab lus tseem ceeb thiab ib lossis ntau lub ntsiab lus.

3D luam ntawv, tseem hu ua additive manufacturing, tsis ntev los no tau tshwm sim los ua ib txoj kev txhim kho cov khoom muaj zog. Laser-raws li 3D luam ntawv tuaj yeem tsim qhov kub thiab txias gradients thiab siab txias, uas tsis tuaj yeem ua tiav los ntawm cov qauv siv. Txawm li cas los xij, "lub peev xwm ntawm kev siv cov txiaj ntsig ua ke ntawm kev tsim khoom ntxiv thiab HEA kom ua tiav cov khoom tshiab yog qhov tsis siv ntau," Zhu hais.

Wen Chen thiab nws pab neeg hauv UMass Multiscale Materials and Manufacturing Laboratory ua ke HEA nrog lub xeev-of-the-art 3D luam ntawv thev naus laus zis, laser hmoov txaj fusion, los tsim cov ntaub ntawv tshiab nrog cov khoom tsis tau pom dua. Vim tias cov txheej txheem melts thiab solidifies cov khoom sai heev piv rau cov txheej txheem metallurgical ib txwm, "koj tau txais ib qho microstructure sib txawv uas nyob deb ntawm qhov sib npaug," Chen hais. Cov qauv microscopic no zoo li lub vev xaib, suav nrog cov txheej txheem sib txawv ntawm cov qauv nanostar hu ua lub ntsej muag-centered cubic (FCC) thiab lub cev-centered cubic (BCC), embedded hauv microscopic eutectic crystals nrog random orientations pawg. Lub hierarchical nanostructured HEA ua rau kev koom tes deformation ntawm ob theem.

Chen Wen tau hais tias: "Lub atomic rearrangement ntawm qhov txawv microstructure no ua rau ultra-siab zog thiab txhim khu ductility, uas yog tsis tshua muaj vim hais tias feem ntau cov ntaub ntawv muaj zog yuav nkig. Qhov no yog qhov sib piv rau cov tsoos hlau casting piv, peb yuav luag peb. Lub sij hawm lub zog, tsis tsuas yog tsis poob ductility, tab sis ua tau nce ductility nyob rau tib lub sij hawm. Rau ntau daim ntawv thov, kev sib xyaw ntawm lub zog thiab ductility yog qhov tseem ceeb.

"Lub peev xwm los tsim HEAs nrog lub zog siab thiab ductility txhais tau hais tias cov ntaub ntawv 3D luam ntawv no muaj zog dua rau kev tiv thaiv kev siv deformation, uas yog ib qho tseem ceeb rau kev tsim cov qauv hnyav nrog kev txhim kho kev siv tshuab thiab kev txuag hluav taws xob," said Jie Ren, tus thawj sau ntawv. .

Ting Zhu pawg ntawm Georgia Tech tau coj cov qauv kev suav sau rau kev kawm. Lawv tau tsim cov qauv kev suav ntawm cov yas ntawm ob-theem siv lead ua kom nkag siab txog lub luag haujlwm ntawm lub tshuab ua si los ntawm FCC thiab BCC nanoparticles thiab yuav ua li cas lawv ua haujlwm ua ke kom muab cov khoom muaj zog thiab ductility.

"Peb cov txiaj ntsig simulation qhia tau hais tias lub zog xav tsis thoob thiab cov lus teb nyuaj ntawm BCC nanoparticles, uas yog qhov tseem ceeb rau kev ua tiav kev sib koom ua ke zoo heev ntawm lub zog thiab ductility hauv peb cov alloys." Zhu Ting tau hais tias, "Qhov kev nkag siab txog kev siv tshuab no tuaj yeem coj mus rau yav tom ntej Kev txhim kho ntawm 3D luam tawm HEAs nrog cov cuab yeej tshwj xeeb muab lub hauv paus tseem ceeb."

Tsis tas li ntawd, 3D luam ntawv muab cov cuab yeej muaj zog los tsim cov geometrically complex thiab kev cai qhov chaw. Nyob rau hauv lub neej yav tom ntej, leveraging 3D tshuab luam ntawv thiab loj loj alloy tsim qhov chaw ntawm HEA muaj ntau lub cib fim rau cov ncaj qha zus tau tej cov qhov kawg rau biomedical thiab aerospace daim ntaub ntawv.