Abaphandi baphande ngokucwangcisiweyo iziphumo zokwakheka kwealloyi ekushicileleni nasekuqinisweni kwe-microstructures, ukuqonda ngcono indlela ukwakheka kwealloyi, ukuguquguquka kwenkqubo, kunye ne-thermodynamics ezichaphazele iinxalenye ezenziweyo ezongezelelweyo. Ngokusebenzisa imifuniselo yoshicilelo ye-3D, bachaza iikhemistri zealloyi kunye neeparamitha zenkqubo ezifunekayo ukuze kuphuculwe iipropathi zealloyi kunye nokushicilela okuphezulu, iindawo ezifanayo kwi-microscale. Ngokusebenzisa ukufundwa koomatshini, benza ifomyula enokusetyenziswa kunye naluphi na uhlobo lwe-alloy ukunceda ukuthintela ukungafani.
Indlela entsha ephuhliswe ngabaphandi baseTexas A&M bakhulisa iipropathi zealloy kunye neeparamitha zenkqubo ukwenza iinxalenye zentsimbi eziprintiweyo eziphezulu ze-3D. Kuboniswe apha i-electron micrograph enemibala ye-nickel powder alloy esetyenziswe kwisifundo. Ngoncedo lukaRaiyan Seede.
Indlela entsha ephuhliswe ngabaphandi baseTexas A&M bakhulisa iipropathi zealloy kunye neeparamitha zenkqubo ukwenza iinxalenye zentsimbi eziprintiweyo eziphezulu ze-3D. Kuboniswe apha i-electron micrograph enemibala ye-nickel powder alloy esetyenziswe kwisifundo. Ngoncedo lukaRaiyan Seede.

I-alloy metal powders esetyenziselwa ukuvelisa okongeziweyo inokuquka umxube wesinyithi, njenge-nickel, i-aluminium, kunye ne-magnesium, kwiindawo ezahlukeneyo. Ngexesha lokuprintwa kwe-laser bed powder fusion 3D, ezi powders zipholile ngokukhawuleza emva kokuba zifudunyezwe ngumqa welaser. Iintsimbi ezahlukeneyo kwi-alloy powder zineepropati ezahlukeneyo zokupholisa kwaye ziqina kumazinga ahlukeneyo. Oku kungahambelani kunokudala iimpazamo ezincinci, okanye i-microsegregation.

"Xa i-alloy powder ipholile, isinyithi ngasinye sinokuphuma," kusho umphandi uRaiyan Seede. “Khawube nomfanekiso wakho ugalela ityuwa emanzini. Inyibilika ngoko nangoko xa isixa setyuwa sincinci, kodwa njengoko ugalela ityuwa eninzi, amasuntswana etyuwa angaphezulu anganyibilikiyo aqalisa ukuphuma njengeekristale. Eneneni, yile nto yenzekayo kwiintsimbi zethu xa ziphola ngokukhawuleza emva kokuprinta.” U-Seede uthe esi siphene sibonakala njengeepokotho ezincinci eziqulathe ugxininiso olwahluke kancinane lwezithako zesinyithi kunoko kufumaneka kwezinye iindawo zenxalenye eprintiweyo.

Abaphandi baphanda nge-microstructures yokuqinisa ezine-binary nickel-based alloys. Kuvavanyo, bafunde isigaba somzimba kwialloyi nganye kumaqondo obushushu ahlukeneyo kunye nokwanda kokugxilwa kwesinye isinyithi kwialloyi esekwe nickel. Besebenzisa imizobo yesigaba esineenkcukacha, abaphandi banqume ukubunjwa kweekhemikhali kwi-alloy nganye eya kubangela ubuncinci be-microsegregation ngexesha lokuvelisa okongeziweyo.

Emva koko, abaphandi banyibilikisa umkhondo omnye we-alloy yentsimbi yomgubo kwiindawo ezahlukeneyo ze-laser kwaye bamisela i-laser powder bed fusion iparameters eziya kuzisa iindawo ezingena-porosity.
Umfanekiso we-electron wokuskena we-microscope ye-laser scan enye yecandelo elinqamlezayo le-nickel kunye ne-alloy ye-zinc. Apha, izigaba ezimnyama, ezinobutyebi be-nickel zidibanisa izigaba ezilula kunye ne-microstructure efanayo. Umngxunya unokubonwa kwisakhiwo se-melt pool. Ngoncedo lukaRaiyan Seede.
Umfanekiso we-electron wokuskena we-microscope ye-laser scan enye yecandelo elinqamlezayo le-nickel kunye ne-alloy ye-zinc. Izigaba ezimnyama, ezinobutyebi be-nickel zidibanisa izigaba ezilula kunye ne-microstructure efanayo. Umngxunya unokubonwa kwisakhiwo se-melt pool. Ngoncedo lukaRaiyan Seede.

Ulwazi olufunyenwe kwimizobo yesigaba, ludibene neziphumo ezivela kwiimvavanyo zengoma enye, lunikeze iqela ngohlalutyo olubanzi lwezicwangciso ze-laser kunye ne-nickel-based alloy compositions enokuvelisa inxalenye eprintiweyo ye-porosity ngaphandle kwe-microsegregation.

Abaphandi ngokulandelayo baqeqeshe iimodeli zokufunda ngomatshini ukuchonga iipatheni kwidatha yovavanyo lwengoma enye kunye nemizobo yesigaba, ukuphuhlisa i-equation ye-microsegregation enokusetyenziswa nayo nayiphi na i-alloy. U-Seede uthe i-equation yenzelwe ukuqikelela ubungakanani bocalucalulo olunikwe uluhlu lwe-alloy yokuqina kunye neempawu zemathiriyeli kunye namandla kunye nesantya selaser.

"Sithatha i-dives enzulu ekulungiseni kakuhle i-microstructure ye-alloys ukwenzela ukuba kubekho ulawulo olungaphezulu kwiipropati zento yokugqibela eprintiweyo kwizinga eliphezulu kakhulu kunangaphambili," kusho uSeede.

Njengoko ukusetyenziswa kwe-alloys kwi-AM kuyanda, kuya kuba njalo nemingeni kwiindawo zokuprinta ezihlangabezana okanye ezidlula imigangatho yomgangatho wokuvelisa. Uphononongo lwaseTexas lwe-A&M luya kwenza abavelisi ukuba basebenzise i-alloy chemistry kunye nenkqubo yeeparamitha ukwenzela ukuba ii-alloys ziyilwe ngokukodwa ukuveliswa okongeziweyo kunye nabavelisi banokulawula i-microstructures ngaphakathi.

"Indlela yethu yokwenza lula ukusetyenziswa ngempumelelo kweealloys zeendlela ezahlukeneyo zokuvelisa ngaphandle kokukhathazeka ngokuzisa iziphene, nakwi-microscale," unjingalwazi u-Ibrahim Karaman uthe. "Lo msebenzi uza kuba luncedo olukhulu kwi-aerospace, izithuthi, kunye nemizi-mveliso yezokhuselo ehlala ijonge iindlela ezingcono zokwakha iindawo zentsimbi."

Unjingalwazi uRaymundo Arroyavé kunye nonjingalwazi u-Alaa Elwany, obambisene noSeede kunye noKaraman kuphando, bathi indlela yokusebenza inokuhlengahlengiswa ngokulula ngamashishini ukuze akhe iindawo ezomeleleyo, ezingenasiphako kunye ne-alloy yazo yokuzikhethela.