An gudanar da bincike mai zurfi akan ƙarin abubuwan da ba kasafai ba (REEs) zuwa 7xxx, 5xxx, da 2xxx jerin alluran aluminium, suna nuna tasirin gaske. Musamman, 7xxx jerin alluran aluminium, waɗanda ke ƙunshe da abubuwa masu haɗawa da yawa, galibi suna fuskantar rarrabuwar kawuna a lokacin narkewa da simintin gyare-gyare, wanda ke haifar da haɓakar adadin matakan eutectic. Wannan yana rage tauri da juriya na lalata, yana daidaita aikin gabaɗaya na gami. Haɗin abubuwan da ba kasafai ba a cikin ƙasa a cikin allunan alumini masu ƙarancin ƙarfi na iya tace hatsi, danne rarrabuwa, da tsarkake matrix, ta haka inganta microstructure da kaddarorin gabaɗaya.
Kwanan nan, wani nau'in mai sarrafa hatsi na superplastic ya sami kulawa. Waɗannan matatun suna yin amfani da abubuwan da ba kasafai ba kamar La da Ce don haɓaka raunin hatsi da iyakokin ƙasa. Wannan ba wai kawai yana tsaftace hatsi ba har ma yana haɓaka daidaitaccen tarwatsawa na precipitates, yana hana recrystallization, kuma yana haɓaka ductility gami da mahimmanci, a ƙarshe yana ƙara yawan aiki a cikin matakai na extrusion.
A cikin 7xxx jerin allurai na aluminum, abubuwan da ba su da yawa na duniya ana ƙara gabaɗaya ta hanyoyi uku:
1.Rare duniya abubuwa kadai;
2.Haɗin Zr da abubuwan da ba kasafai ba;
3.Haɗin Zr, Cr, da abubuwan da ba kasafai ake samun su ba.
Jimlar abun ciki na abubuwan da ba kasafai ake samun su ba yawanci ana sarrafa su tsakanin 0.1-0.5 wt.
Hanyoyin Halitta na Rare Duniya
Abubuwan da ba a sani ba kamar La, Ce, Sc, Er, Gd, da Y suna ba da gudummawa ga allo na aluminum ta hanyoyi da yawa:
Gyaran hatsi: Abubuwan da ba kasafai suke yin kasa ba suna samar da hazo iri-iri waɗanda ke aiki a matsayin wuraren ɓarkewar ƙwayar cuta, suna mai da tsarin dendritic zuwa nau'in hatsi masu kyau, wanda ke inganta ƙarfi da ductility.
Danne rarrabuwa: A lokacin narkewa da ƙarfafawa, abubuwan da ba kasafai ba na duniya suna haɓaka mafi yawan rarraba nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan rarrabawa, rage haɓakar eutectic, da haɓaka ƙimar matrix.
Matrix tsarkakewa: Y, La, da Ce iya amsa tare da ƙazanta a cikin narke (O, H, N, S) don samar da barga mahadi, ragewan gas abun ciki da inclusions, wanda kara habaka alloy ingancin.
Sauya halayen sake sake ƙirƙira: Wasu abubuwan da ba kasafai ba na duniya na iya ƙulla hatsi da iyakokin ƙasa, da hana motsin karkacewa da ƙauran iyakar hatsi. Wannan yana jinkirta recrystallization kuma yana adana kyakkyawan tsarin subgrain yayin sarrafa zafi, inganta duka ƙarfi da juriya na lalata.
Mabuɗin Rare Abubuwan Duniya da Tasirinsu
Scandium (Sc)
Sc yana da mafi ƙarancin radius atomic tsakanin abubuwan da ba kasafai ake samun su ba kuma ƙarfe ne na canji. Yana da matukar tasiri wajen haɓaka kaddarorin naƙasassun allunan aluminum.
A cikin allunan aluminium, Sc yana haɓaka azaman daidaitacce Al₃Sc, yana ƙara yawan zafin jiki na recrystallization da murkushe ƙwayar hatsi.
Lokacin da aka haɗe su da Zr, ƙayyadaddun ɓangarorin Al₃ (Sc, Zr) masu zafi suna samuwa, suna haɓaka nau'in hatsi masu kyau da kuma hana motsin motsi da ƙaura iyakar hatsi. Wannan yana inganta ƙarfi, juriya na gajiya, da aikin damuwa-lalata.
Yawan Sc na iya haifar da ɓarke Al₃ (Sc, Zr), rage ƙarfin recrystallization, ƙarfi, da ductility.
Erbium (Er)
Er yana aiki iri ɗaya ga Sc amma ya fi tasiri.
A cikin jerin alloys na 7xxx, abubuwan da suka dace Er suna tace hatsi, hana motsin motsi da ƙaura iyakar hatsi, danne recrystallization, da haɓaka ƙarfi.
Lokacin da aka haɗa tare da Zr, Al₃(Er,Zr) barbashi suna samuwa, waɗanda suka fi ƙarfin zafi fiye da Al₃Er kaɗai, suna samar da mafi kyawun murkushe recrystallization.
Matsakaicin Er yana iya haifar da matakan Al₈Cu₄Er, yana rage duka ƙarfi da ductility.
Gadolinium (Gd)
Ƙididdigar Gd masu matsakaici suna tace hatsi, ƙara ƙarfi da ductility, da haɓaka solubility na Zn, Mg, da Cu a cikin matrix.
Sakamakon matakin Al₃(Gd,Zr) yana nuna rarrabuwar kawuna da iyakoki na ƙasa, yana murkushe recrystallization. Fim mai aiki kuma yana tasowa akan saman hatsi, yana ƙara iyakance haɓakar hatsi.
Gd da yawa na iya haifar da ƙwanƙwasa hatsi da ɓarna kayan inji.
Lanthanum (La), Cerium (Ce), da Yttrium (Y)
La yana tsaftace hatsi, yana rage abun ciki na oxygen, kuma ya samar da fim mai aiki akan saman hatsi don hana ci gaba.
La da Ce suna haɓaka yankin GP da η′ hazo lokaci, haɓaka ƙarfin matrix da juriya na lalata.
Y yana tsarkake matrix, yana hana rushewar manyan abubuwan haɗin gwiwa a cikin ingantaccen bayani, yana haɓaka ƙaddamarwa, kuma yana rage yuwuwar bambance-bambance tsakanin iyakokin hatsi da ciki, haɓaka juriya na lalata.
Wuce kima La, Ce, ko Y na iya haifar da m blocky mahadi, wanda rage ductility da ƙarfi.
Halayen manyan abubuwan da ba kasafai ba a duniya da halayensu a cikin aluminum
Lokacin aikawa: Agusta-21-2025
