Yiziphi izinto ezibonakalayo ze-zirconium 705 alloy?
I-Zirconium ine-thermal neutron absorption cross-section ephansi, amandla aphezulu nobulukhuni, ukumelana nokugqwala okuhle kakhulu, kanye ne-ductility. Isetshenziswa kabanzi emikhakheni yemboni yamandla e-athomu, i-aerospace, kanye ne-biomedicine. Kuyinto ebalulekile yamasu, eyaziwa nangokuthi "Insimbi yokuqala yenkathi ye-athomu." Ukuqhubeka nokwandisa ukuzinza kwe ukusetshenziswa kwe-zirconium alloys futhi unciphise ubunzima ekucubunguleni nasekukhiqizeni, kubalulekile ukuxhuma izinto ze-zirconium alloy. Ngakho-ke, kubalulekile ukutadisha ukwakheka kanye nezakhiwo zokuxhunywa kwe-alloy ephindwe kabili ngemuva kokwakhiwa ngobuchwepheshe bokushisela, futhi i-diffusion welding Iyindlela evamile yokuhlanganisa impahla engasetshenziselwa ukushisela i-zirconium ne-zirconium alloys.
I-Zr705 ingxube ye-zirconium yayisetshenziswa njengento eyisisekelo, i-Cu yanezelwa njengesendlalelo esiphakathi, futhi i-vacuum diffusion welding yenziwa ngaphansi kwezimo ezahlukene. Imiphumela yogqinsi lwesendlalelo esiphakathi kwe-Cu kanye nezinga lokushisa lokushisela ku-microstructure kanye nezakhiwo zemishini zejoyinti elishiselwe ukusabalalisa kwacwaningwa kakhulu. Kwaxoxwa ngamajoyinti. Indlela yokwakheka; ngaphezu kwalokho, ukumelana nokugqwala kwamalunga ezixazululweni ezine-asidi kwahlolwa ngokuhlolwa kokucwiliswa kokugqwala, futhi ukumelana nokugqwala kwamalunga ashiselwe atholwe ngaphansi kogqinsi oluhlukene oluphakathi nendawo namazinga okushisa okushisela kwacwaningwa. Imiphumela ibonisa:
① Ngemva kokwengeza i-Cu foil njengesendlalelo esimaphakathi, lapho ugqinsi lwe-Cu foil ingu-30μm-welding lokushisa 900>920 °C nogqinsi lwe-Cu foil luyi-10μm-welding lokushisa 880, 900, 920°C, isixhumi esibonakalayo kwakheka eduze nesisekelo. metal Kunezinhlaka ezimbili zenhlangano, isakhiwo se-Widmanstatten, kanye nesakhiwo sezigaba ezimbili, okungenzeka kubangelwe ukusabalala kwama-athomu e-Cu. Uma izinga lokushisa lingaphezu kuka-920 °C futhi lifinyelela ku-940 noma 960°C, izinga lokushisa lapho u-a->p uguqulwa ngokuphelele uyafinyelelwa, futhi sonke isakhiwo se-base material isakhiwo se-Widmanstatten.
② Uma ukuqina kwe-Cu foil kungu-30μm - izinga lokushisa lokushisela 900, 920% kanye nogqinsi lwe-Cu foil 10μm. Ukushisa kwe-Welding 880.900 ° C, ungqimba lwenhlanganisela ye-intermetallic kwakheka ekuhlanganyeleni, futhi lolu ungqimba lwamakhemikhali luqukethe i-Zr2Cu.Zri4Cu5i> ZrCu>ZrCu5 ne-Zr3Cu8 izigaba kanye nezigaba ze-Zr7Cuio ne-Zr8Cu5 zingase zibe khona. Ukwengeza, lapho usebenzisa i-Cu enogqinsi luka-10 μm njengongqimba oluphakathi nendawo ekushiseni okufanayo (920 °C), awekho ama-intermetallic compounds akhiwe, okubonisa ukuthi ukushuba kwefoyili yethusi kunomthelela othile ekuphenduleni kwamakhemikhali okuhlangana ubuso. Lapho ukhuphula izinga lokushisa lokunamathisela libe ngu-940 °C no-960 °C. (Ngesikhathi sesi-2, alukho ungqimba oluhlanganisiwe lwensimbi olwakhiwe emajoyintini lapho i-Cu enogqinsi luka-30pm noma u-10pm yengezwe njengongqimba olumaphakathi. Isizathu kungaba ukuthi izinga lokushisa lokushisela lasheshisa izinga lokusabalalisa kanye nebanga lama-athomu e-Cu ku-athomu. i-matrix Zr, kanye nama-athomu e-Cu ayeqinile. Incibilikisiwe ku-matrix Zr, indawo yesixazululo eqinile ye-Zr-Cu ebanzi ekugcineni iyakhiwa.
③ Ebugqileni be-foil engu-30μmCu, amandla amakhulu okuqinile akhuphuka kancane kancane ngokwanda kwezinga lokushisa, futhi ubude bukhuphuka kuqala bese buyancipha, bese izinga lokushisa liba ngu-940 °C; ebukhulu be-foil engu-10μmCu, amandla amakhulu okuqina kanye nokwelula kokubili Izici zomshini zamalunga akha ungqimba oluhlanganisiwe zimbi, okufanele kube ngenxa yesigaba esiqinile esiphukayo senhlanganisela ye-intermetallic. Izici zomshini zamajoyinti ngaphandle kwenhlanganisela yensimbi ye-intermetallic zithuthukiswa kakhulu lapho izinga lokushisa lingu-940 °C. Lapho, amandla amakhulu okudonsa nokunwebeka kwelunga kwakuphakeme kakhulu phakathi kwawo wonke ugqinsi, futhi kwanda kusuka ku-576MPa kanye no-23% ku-30μm kuya ku-580MPa kanye no-32% ku-10μm (isisekelo sokuqala 585MPa no-44%).
Izinga lokugqwala kwe ingxube ye-zirconium oketshezini olune-asidi olubolayo lungaphansi kuka-0.5%/h. Ngokombono we-corrosion micromorphology, ukumelana nokugqwala yilokhu: i-post-weld base material > indawo ye-weld ngaphandle kwe-compound layer > isisekelo sokuqala > i-compound layer Weld area; ngokombono wezinga lokugqwala kanye nezinga lokuncipha kwesisindo, izinga lokugqwala kanye nezinga lokuncipha kwesisindo sezinto eziyisisekelo sangempela ziphezulu kakhulu, nezinga lokuncipha kwesisindo lifinyelela ku-44%. Njengoba izinga lokushisa lokushisela likhuphuka, izinga lokugqwala liyancipha futhi izinga lokulahlekelwa isisindo liyancipha.
