Nguva pfupi yadarika, Institute of Mechanics yeChinese Academy yeScience yakabatana nevatsvaguri vekumba nekune dzimwe nyika kuti vafambire mberi patsva mukurwisa kuchembera kwemidziyo yegirazi, uye kekutanga vakaedza kuona chimiro chehudiki chegirazi resimbi mu. ultra-fast time scale.Mhedzisiro yakabatana yakanzi Ultrafast yakanyanyisa rejuvenation yemagirazi esimbi nekutsikitsira, yakaburitswa muScience Advances (Science Advances 5: eaaw6249 (2019)).
Iyo metastable girazi zvinhu zvine maitiro ekuchembera ega kune iyo thermodynamic equilibrium state, uye panguva imwecheteyo, inoperekedzwa nekuipa kwezvinhu zvinhu.Zvisinei, kuburikidza nekupinza kwesimba rekunze, girasi rinochembera rinogona kugadzirisa chimiro (rejuvenation).Iyi nzira yekurwisa kuchembera kune rumwe rutivi inobatsira pakunzwisisa kwekutanga kwemaitiro akaomarara egirazi, kune rimwe divi inobatsirawo kukushandiswa kweinjiniya yezvigadzirwa zvegirazi.Mumakore achangopfuura, kune zvesimbi zvegirazi zvinhu zvine tarisiro yakafara yekushandiswa, nhevedzano yemaitiro ekuvandudza nzira yakavakirwa pane isina-affine deformation yakatsanangurwa kuitira kunyatso kudzora mechanic uye yemuviri zvimiro zvemidziyo.Zvisinei, nzira dzose dzekare dzekuvandudza dzinoshanda pamazinga akaderera ekushushikana uye dzinoda nguva yakareba yakakwana, uye naizvozvo dzine zvipingamupinyi zvikuru.
Vatsvagiri vakavakirwa pambiri-yakananga ndiro yekukanganisa tekinoroji yechiedza gasi pfuti, vakaona kuti yakajairika zirconium-yakavakirwa simbi girazi yakakurumidza kuvandudzwa kusvika padanho repamusoro mukati me365 nanoseconds (miriyoni imwe yenguva inotora kuti munhu abwaire. ziso).Enthalpy yakakanganiswa zvakanyanya.Dambudziko reiyi tekinoroji nderekuisa akati wandei GPa-level single-pulse kurodha uye nekupfuura otomatiki kuburitsa kune esimbi girazi, kuitira kudzivirira kutadza kusimba kwezvinhu zvakaita semabhendi ekugera uye spallation;panguva imwecheteyo, nekudzora kukurumidza kwekukurumidza kweiyo flyer, simbi Inokurumidza kuvandudzwa kwegirazi "inotonhora" pamatanho akasiyana.
Vatsvakurudzi vakaita tsvakurudzo yakazara pamusoro pe-ultra-fast rejuvenation process yegirazi resimbi kubva pamaonero e thermodynamics, multi-scale structure uye phonon dynamics "Bose peak", zvichiratidza kuti kuvandudzwa kwegirazi chimiro kunobva nano-scale clusters.Vhoriyamu yemahara inokonzerwa ne "shear transition" mode.Kubva pane iyi mashandiro emuviri, nhamba isina dimensionless yeDeborah inotsanangurwa, iyo inotsanangura mukana weiyo nguva chiyero chekupedzisira-nekukurumidza rejuvenation yesimbi yegirazi.Iri basa rakawedzera chiyero chenguva yekuvandudzwa kwesimbi yegirazi zvimiro neinosvika gumi mirairo yehukuru, yakawedzera minda yekushandisa yerudzi urwu rwezvinhu, uye yakadzamisa kunzwisisa kwevanhu kweiyo ultrafast dynamics yegirazi.
Nguva yekutumira: Zvita-06-2021