Yin alfahari damafi girma narkewa da wuraren tafasadaga dukkan abubuwan da aka sani,tungstenya zama sanannen zaɓi don aikace-aikacen da suka haɗa da matsanancin zafi, gami dafilament kwan fitila, arc waldi, kariya daga radiationkuma, kwanan nan, kamar yaddaabu mai fuskantar plasmaa cikin fusion reactors kamar ITER Tokamak.

Duk da haka,tungsten ta asali brittleness, da kuma microcracking da ke faruwa yayin da ake ƙara haɓakawa (3-D bugu) tare dakarfen da ba kasafai ba, ya kawo cikas ga karbuwarta.

Don kwatanta yadda da kuma dalilin da yasa wadannan microcracks suka samar, Lawrence Livermore National Laboratory (LLNL) masana kimiyya sun haɗu da simintin thermomechanical tare da bidiyo mai sauri da aka ɗauka yayin aikin 3-D na ƙarfe na Laser foda-gado (LPBF). Ganin cewa binciken da ya gabata ya iyakance ga bincikar fasa bayan gini, masana kimiyya a karon farko sun sami damar hangen nesa na ductile-to-brittle (DBT) a cikin tungsten a cikin ainihin lokaci, yana ba su damar lura da yadda microcracks ya fara da yadawa azaman ƙarfe. mai zafi da sanyaya. Ƙungiyar ta sami damar daidaita al'amuran microcracking tare da masu canji kamar saura danniya, ƙima da zafin jiki, kuma sun tabbatar da DBT ya haifar da fashewa.

Masu bincike sun ce binciken, wanda aka buga kwanan nan a cikin mujallar Acta Materialia kuma aka fito a cikin watan Satumba mai daraja ta MRS Bulletin, ya bankado muhimman hanyoyin da ke tattare da fasa bututun mai.3-D-bugu tungstenkuma ya kafa tushe don ƙoƙarce-ƙoƙarce na gaba don samar da sassan da ba su da fasa daga karfe.

“Saboda irin kaddarorinsa na musamman.tungstenya taka muhimmiyar rawa a aikace-aikace na musamman na Ma'aikatar Makamashi da Ma'aikatar Tsaro, "in ji babban jami'in binciken Manyalibo "Ibo" Matthews. “Wannan aikin yana taimakawa buɗe hanyar zuwa sabon yankin sarrafa kayan haɓaka dontungstenwanda zai iya yin tasiri mai mahimmanci ga waɗannan ayyukan."

Ta hanyar duban gwajin su da ƙirar ƙira da aka yi ta amfani da lambar LLNL's Diablo finite element code, masu binciken sun gano cewa microcracking a cikin tungsten yana faruwa a cikin ƙaramin taga tsakanin digiri 450 zuwa 650 Kelvin kuma yana dogara da ƙimar nau'in, wanda sigogin tsari ke tasiri kai tsaye. Hakanan sun sami damar daidaita girman yankin da abin ya shafa da fashewar yanayin hanyar sadarwa zuwa matsi na gida.

Lawrence Fellow Bey Vrancken, babban marubucin takardar kuma babban mai bincike, ya tsara da kuma gudanar da gwaje-gwajen kuma ya gudanar da mafi yawan bayanan.

Vrancken ya ce "Na yi hasashen cewa za a yi jinkiri wajen fashe tungsten, amma sakamakon ya wuce yadda nake tsammani." "Tsarin thermomechanical ya ba da bayani ga duk abubuwan da muka lura na gwaji, kuma duka biyun an yi cikakken dalla-dalla don ɗaukar nauyin dogaro na DBT. Tare da wannan hanyar, muna da kyakkyawan kayan aiki don ƙayyade dabarun mafi inganci don kawar da fatattaka yayin LPBF na tungsten.

Masu bincike sun ce aikin yana ba da cikakkun bayanai, fahimtar mahimmancin tasirin sigogin tsari da narkar da lissafi akan samuwar fasa kuma yana nuna tasirin abun da ke ciki da preheating suna da daidaiton tsarin sassan da aka buga tare da tungsten. Ƙungiyar ta ƙarasa da cewa ƙara wasu abubuwan haɗin gwal na iya taimakawa rage sauyin DBT da ƙarfafa ƙarfe, yayin da preheating zai iya taimakawa wajen rage microcracking.

Ƙungiyar tana amfani da sakamakon don kimanta dabarun rage ƙwaƙƙwaran da ake da su, kamar tsari da gyare-gyaren gami. Sakamakon binciken, tare da binciken binciken da aka samar don binciken, zai kasance mahimmanci ga babban burin dakin gwaje-gwaje na 3-D bugu na sassan tungsten marasa fasa da za su iya jure matsanancin yanayi, in ji masu binciken.