Abacwaningi baphenye ngokuhlelekile imiphumela yokubunjwa kwe-alloy ekuphrinteni nasekuqinisweni kwama-microstructures, ukuze baqonde kangcono ukuthi ukwakheka kwe-alloy, ukuguquguquka kwenqubo, kanye ne-thermodynamics kuthinte kanjani izingxenye ezenziwe ngokungeziwe. Ngokuhlolwa kokuphrinta kwe-3D, bachaze amakhemikhali e-alloy kanye nemingcele yokucubungula edingekayo ukuze kuthuthukiswe izakhiwo ze-alloy nokuphrinta izingxenye eziphezulu, ezifanayo ku-microscale. Besebenzisa umshini wokufunda, badale ifomula engasetshenziswa nanoma yiluphi uhlobo lwengxubevange ukusiza ukuvimbela ukungafani kwe-nonuniformity.
Indlela entsha ethuthukiswe abacwaningi base-Texas A&M ithuthukisa izakhiwo ze-alloy futhi icubungule amapharamitha ukuze kwakhiwe izingxenye zensimbi eziphrinte nge-3D. Kuboniswe lapha i-electron micrograph enombala ye-nickel powder alloy esetshenziswe ocwaningweni. Ibungazwe ngu-Raiyan Seede.
Indlela entsha ethuthukiswe abacwaningi base-Texas A&M ithuthukisa izakhiwo ze-alloy futhi icubungule amapharamitha ukuze kwakhiwe izingxenye zensimbi eziphrinte nge-3D. Kuboniswe lapha i-electron micrograph enombala ye-nickel powder alloy esetshenziswe ocwaningweni. Ibungazwe ngu-Raiyan Seede.

Izimpushana zensimbi ye-alloy ezisetshenziselwa ukwenza okungeziwe zingaqukatha ingxube yezinsimbi, njenge-nickel, i-aluminium, ne-magnesium, ekugxilweni okuhlukene. Ngesikhathi sokuphrinta kwe-laser bed powder fusion 3D, lezi zimpushana ziphola ngokushesha ngemva kokushisisa nge-laser beam. Izinsimbi ezahlukene ku-alloy powder zinezindawo zokupholisa ezihlukene futhi ziyaqina ngamanani ahlukene. Lokhu kungahambisani kungadala amaphutha amancane, noma ukuhlukaniswa okuncane.

"Lapho i-alloy powder iphola, izinsimbi ngazinye zingaphuma," kusho umcwaningi uRaiyan Seede. “Cabanga uthela usawoti emanzini. Incibilika ngokushesha lapho inani likasawoti lilincane, kodwa njengoba uthela usawoti owengeziwe, izinhlayiya zikasawoti ezingaphezu kwezingancibiliki ziqala ukuncibilika njengamakristalu. Empeleni, yilokho okwenzeka ezinsimbini zethu lapho zipholile ngokushesha ngemva kokunyathelisa.” U-Seede uthe lesi sici sibonakala njengamaphakethe amancane aqukethe ukuhlangana okuhluke kancane kwezithako zensimbi kunalezo ezitholakala kwezinye izindawo zengxenye ephrintiwe.

Abacwaningi baphenye ama-microstructures okuqinisa ama-alloys amane anambambili ane-nickel-based. Ezivivinyweni, bafunde isigaba somzimba sengxubevange ngayinye emazingeni okushisa ahlukene kanye nasekugxiliseni okukhulayo kwenye insimbi kungxubevange esekelwe ku-nickel. Besebenzisa imidwebo yesigaba enemininingwane, abacwaningi banqume ukwakheka kwamakhemikhali kwe-alloy ngayinye okungabangela ukuhlukaniswa okuncane okuncane ngesikhathi sokukhiqiza okungeziwe.

Okulandelayo, abacwaningi bancibilikisa ithrekhi eyodwa ye-alloy metal powder kuzilungiselelo ezahlukene ze-laser futhi banquma imingcele yenqubo yokuhlanganisa i-laser powder bed ezoletha izingxenye ezingenayo i-porosity.
Isithombe se-electron microscope esithwebulayo sesiqephu esiphambanayo se-laser scan ye-nickel ne-zinc alloy. Lapha, izigaba ezimnyama, ezicebile nge-nickel zihlukanisa izigaba ezilula ne-microstructure efanayo. Imbotshana ingabonwa futhi esakhiweni sechibi elincibilikayo. Ibungazwe ngu-Raiyan Seede.
Isithombe se-electron microscope esithwebulayo sesiqephu esiphambanayo se-laser scan ye-nickel ne-zinc alloy. Izigaba ezimnyama, ezicebile nge-nickel zihlukanisa izigaba ezilula ne-microstructure efanayo. Imbotshana ingabonwa futhi esakhiweni sechibi elincibilikayo. Ibungazwe ngu-Raiyan Seede.

Ulwazi olutholwe emidwebeni yesigaba, luhlanganiswe nemiphumela yokuhlolwa kwethrekhi eyodwa, lunikeze ithimba ukuhlaziya okuphelele kwezilungiselelo ze-laser kanye nokuqanjwa kwe-alloy okusekelwe ku-nickel okungaveza ingxenye ephrintiwe engena-porosity ngaphandle kokuhlukaniswa okuncane.

Abacwaningi abalandelayo baqeqeshe amamodeli okufunda ngomshini ukuze bakhombe amaphethini kudatha yokuhlola yethrekhi eyodwa kanye nemidwebo yesigaba, ukuthuthukisa isibalo se-microsegregation engasetshenziswa nanoma iyiphi ingxubevange. U-Seede uthe i-equation yakhelwe ukubikezela izinga lokuhlukaniswa uma kubhekwa uhla lokuqiniswa kwengxubevange kanye nezakhiwo ezibonakalayo namandla nesivinini se-laser.

"Singena ngokujulile ekulungiseni kahle i-microstructure yama-alloys ukuze kube nokulawula okwengeziwe kwezakhiwo zento yokugcina ephrintiwe ngesilinganiso esihle kakhulu kunangaphambili," kusho u-Seede.

Njengoba ukusetshenziswa kwama-alloys ku-AM kwanda, kanjalo nezinselelo zokuphrinta izingxenye ezihlangabezana noma ezeqa amazinga ekhwalithi yokukhiqiza. Ucwaningo lwe-Texas A&M luzovumela abakhiqizi ukuthi basebenzise i-alloy chemistry futhi bacubungule amapharamitha ukuze ama-alloys akhelwe ngokukhethekile ukukhiqiza okungeziwe futhi abakhiqizi bakwazi ukulawula izakhiwo ezincane endaweni.

"Indlela yethu yenza kube lula ukusetshenziswa ngempumelelo kwama-alloys ezingoma ezahlukahlukene zokukhiqiza izithasiselo ngaphandle kokukhathazeka ngokuletha amaphutha, ngisho nasezindaweni ezincane," kusho uprofesa u-Ibrahim Karaman. “Lo msebenzi uzoba wusizo olukhulu ezimbonini zezindiza, ezezimoto nezokuvikela ezihlale zifuna izindlela ezingcono zokwakha izingxenye zensimbi ezenziwe ngokwezifiso.”

USolwazi Raymundo Arroyavé kanye noprofesa u-Alaa Elwany, obambisene noSeede noKaraman ocwaningweni, bathi le ndlela ingashintshwa kalula yizimboni ukuze zakhe izingxenye eziqinile, ezingenasici nge-alloy yazo yokuzikhethela.