Kutshanje, iZiko leeMechanics zeZiko leeSayensi zaseTshayina libambisene nabaphandi basekhaya nakwamanye amazwe ukwenza inkqubela-phambili entsha ekulweni nokuguga kwemathiriyeli yeglasi, kwaye okokuqala ngqa baqonda ubume obutsha kakhulu beglasi yentsimbi eqhelekileyo. isikali sexesha elikhawulezayo. Iziphumo ezihambelanayo zinesihloko esithi Ultrafast extreme rejuvenation of metallic glasses by shock compression , epapashwe kwi-Science Advances (I-Science Advances 5: eaaw6249 (2019)).
Isixhobo seglasi esine-metastable sinomkhuba wokuguga ngokuzenzekelayo kwi-thermodynamic equilibrium state, kwaye ngexesha elifanayo, lihamba kunye nokuwohloka kwezinto eziphathekayo. Nangona kunjalo, ngokusebenzisa igalelo lamandla angaphandle, izinto zeglasi eziguga ziyakwazi ukuvuselela isakhiwo (ukuvuselela). Le nkqubo yokulwa nokuguga kwelinye icala inegalelo ekuqondeni okusisiseko kokuziphatha okuguquguqukayo okuntsonkothileyo kweglasi, kwelinye icala kukwaluncedo ekusetyenzisweni kobunjineli bezinto zeglasi. Kwiminyaka yakutshanje, kwizixhobo zeglasi zentsimbi kunye nethemba elibanzi lokusetyenziswa, uluhlu lweendlela zokuvuselela izakhiwo ezisekelwe kwi-non-affine deformation ziye zacetywayo ukuze kulawulwe ngokufanelekileyo iimpawu zoomatshini kunye nezomzimba wezinto eziphathekayo. Nangona kunjalo, zonke iindlela zokuvuselela zangaphambili zisebenza kumanqanaba aphantsi oxinzelelo kwaye zifuna isikali sexesha elide ngokwaneleyo, kwaye ngoko ke zinemida emikhulu.
Abaphandi basekwe kwitekhnoloji yempembelelo yepleyiti ekujoliswe kuyo kabini yesixhobo sompu wegesi olula, baqaphela ukuba iglasi yentsimbi esekwe zirconium yakhawuleza yavuselelwa yaya kutsho kwinqanaba eliphezulu malunga neenanoseconds ezingama-365 (isinye kwisigidi sexesha elithathwayo ukuba umntu aqhwanyaze. iliso). I-Enthalpy iphazamiseke kakhulu. Umceli mngeni wobu bugcisa kukusebenzisa inqanaba elinye le-GPa yokulayisha kunye nokukhuphela okuzenzekelayo okwethutyana kwiglasi yentsimbi, ukuze kuthintelwe ukusilela okuguquguqukayo kwemathiriyeli efana neebhanti zokucheba kunye ne-spallation; ngelo xesha, ngokulawula isantya sempembelelo yeflaya, isinyithi Ukuvuselelwa ngokukhawuleza kweglasi "iqhwa" kumanqanaba ahlukeneyo.
Abaphandi baye baqhuba uphando olubanzi kwinkqubo yokuvuselela i-ultra-fast-fast rejuvenation yeglasi yensimbi ukusuka kwimibono ye-thermodynamics, i-multi-scale structure kunye ne-phonon dynamics "i-Bose peak", ebonisa ukuba ukuvuselelwa kwesakhiwo seglasi kuvela kumaqela e-nano-scale. Umthamo wasimahla owenziwe yimowudi ye "shear transition". Ngokusekwe kolu matshini womzimba, kuchazwa inani le-Deborah elingenamda, elicacisa ukuba nokwenzeka kwesikali sexesha lokuvuselelwa okukhawulezileyo kweglasi yentsimbi. Lo msebenzi uye wandisa isikali sexesha lokuvuselelwa kwezakhiwo zeglasi yentsimbi ubuncinane ii-odolo ze-10 zobukhulu, ukwandisa imimandla yesicelo solu hlobo lwezinto eziphathekayo, kunye nokuqonda nzulu kwabantu kwi-ultrafast dynamics yeglasi.
Ixesha lokuposa: Dec-06-2021