Muva nje, i-Institute of Mechanics of the Chinese Academy of Sciences ibambisane nabacwaningi ekhaya nakwamanye amazwe ukwenza inqubekelaphambili entsha ekulweni nokuguga kwezinto zengilazi, futhi ngokokuqala ngqa, yaqaphela isakhiwo esisemusha kakhulu sengilazi yensimbi evamile isikali sesikhathi esishesha kakhulu.Imiphumela ehlobene inesihloko esithi Ukuvuselelwa okunamandla okudlulele kwengilazi yensimbi ngokucindezelwa kokushaqeka, eshicilelwe ku-Science Advances (Intuthuko Yesayensi 5: eaaw6249 (2019)).
I-metastable glass material inomkhuba wokuguga ngokuzenzekelayo esimweni se-thermodynamic equilibrium, futhi ngesikhathi esifanayo, ihambisana nokuwohloka kwezinto ezibonakalayo.Kodwa-ke, ngokufaka amandla angaphandle, izinto zeglasi eziguga zingavuselela isakhiwo (ukuvuselela).Le nqubo yokulwa nokuguga ngakolunye uhlangothi inomthelela ekuqondeni okuyisisekelo kokuziphatha okuguquguqukayo okuyinkimbinkimbi kwengilazi, ngakolunye uhlangothi ibuye ibe nomthelela ekusetshenzisweni kobunjiniyela bezinto zengilazi.Eminyakeni yamuva, ngezinto zengilazi zensimbi ezinamathemba okusebenza okubanzi, uchungechunge lwezindlela zokuvuselela izakhiwo ezisekelwe ekuguquguqukeni okungaxhunywanga kuye kwahlongozwa ukuze kulawulwe ngokuphumelelayo izakhiwo zemishini nezomzimba zezinto zokwakha.Kodwa-ke, zonke izindlela zokuvuselela zangaphambilini zisebenza emazingeni aphansi okucindezeleka futhi zidinga isilinganiso sesikhathi eside ngokwanele, ngakho-ke zinemikhawulo emikhulu.
Abacwaningi abasuselwe kubuchwepheshe bomphumela wepuleti eliqondiwe kabili ledivayisi yesibhamu segesi elilula, baqaphela ukuthi ingilazi yensimbi evamile esekwe ku-zirconium yasheshe yavuselelwa yaba sezingeni eliphakeme cishe ngama-nanosecond angu-365 (ingxenye eyisigidi yesikhathi esisithathayo ukuze umuntu acwayize iso).I-Enthalpy iphazamiseke kakhulu.Inselele yalobu buchwepheshe ukusebenzisa ukulayisha okuningana kweleveli eyodwa ye-GPa kanye nokuthulula okuzenzakalelayo kwesikhashana engilazini yensimbi, ukuze kugwenywe ukwehluleka okuguquguqukayo kwezinto ezinjengamabhande okugunda kanye ne-spallation;ngesikhathi esifanayo, ngokulawula isivinini somthelela weflaya, insimbi Ukuvuselelwa okusheshayo kwengilazi "kufriza" emazingeni ahlukene.
Abacwaningi baye benza ucwaningo olunzulu ngenqubo yokuvuselela ingilazi yensimbi ye-ultra-fast kusukela ekubukeni kwe-thermodynamics, isakhiwo se-multi-scale kanye ne-phonon dynamics "i-Bose peak", eveza ukuthi ukuvuselelwa kwesakhiwo seglasi kuvela kumaqoqo e-nano-scale.Ivolumu yamahhala edalwe imodi "yenguquko ye-shear".Ngokusekelwe kulo mshini obonakalayo, kuchazwa inombolo ka-Deborah engena-Dimensional, echaza ukuthi kungenzeka yini isikali sesikhathi sokuvuselelwa kabusha okushesha kakhulu kwengilazi yensimbi.Lo msebenzi ukhuphule isilinganiso sesikhathi sokuvuselelwa kwezakhiwo zengilazi yensimbi okungenani ngama-oda ayi-10 obukhulu, wandisa izinkambu zokusetshenziswa zalolu hlobo lwezinto ezibonakalayo, futhi wajulisa ukuqonda kwabantu amandla engilazi asheshayo.
Isikhathi sokuthumela: Dec-06-2021