Posachedwapa, Institute of zimango wa Chinese Academy of Sciences wagwirizana ndi ofufuza kunyumba ndi kunja kuti kupita patsogolo kwatsopano odana ndi ukalamba zipangizo galasi, ndipo kwa nthawi yoyamba experimentally anazindikira dongosolo kwambiri unyamata wa lililonse zitsulo galasi mu nthawi yofulumira kwambiri.Zotsatira zofananirazo zimatchedwa Ultrafast kwambiri rejuvenation of metallic glasses by shock compression, lofalitsidwa mu Science Advances (Science Advances 5: eaaw6249 (2019)).
Magalasi osasunthika amakhala ndi chizolowezi chokalamba modzidzimutsa ku thermodynamic equilibrium state, ndipo nthawi yomweyo, amatsagana ndi kuwonongeka kwa zinthu zakuthupi.Komabe, kupyolera mu kulowetsa kwa mphamvu zakunja, zinthu zagalasi zokalamba zimatha kukonzanso dongosolo (kutsitsimutsa).Njira yolimbana ndi ukalamba kumbali imodzi imathandizira kumvetsetsa kwamphamvu kwamphamvu yagalasi, komano imathandiziranso kugwiritsa ntchito uinjiniya wa zida zamagalasi.M'zaka zaposachedwa, kwa zida zamagalasi zachitsulo zokhala ndi chiyembekezo chogwiritsa ntchito mozama, njira zingapo zotsitsimutsanso zozikidwa pa ma deformation osagwirizana ndi affine zaperekedwa kuti ziwongolere bwino zamakanikidwe ndi mawonekedwe azinthuzo.Komabe, njira zonse zotsitsimutsa zam'mbuyomu zimagwira ntchito pazigawo zochepetsetsa zopanikizika ndipo zimafuna nthawi yayitali yokwanira, motero zimakhala ndi zofooka zazikulu.
Akatswiri ofufuza pogwiritsa ntchito ukadaulo wa zida zamfuti za gasi, adazindikira kuti magalasi achitsulo opangidwa ndi zirconium adatsitsimutsidwanso mpaka kufika pamlingo wapamwamba kwambiri pafupifupi 365 nanoseconds (gawo limodzi mwamiliyoni nthawi yomwe zimatengera kuti munthu aphethire. diso).Enthalpy ndi yosokonezeka kwambiri.Chovuta chaukadaulo uwu ndikuyika zingapo za GPa-level single-pulse ndikutsitsa kwapang'onopang'ono ku magalasi azitsulo, kuti tipewe kulephera kwamphamvu kwa zinthu monga mikombero yometa ubweya ndi spallation;panthawi imodzimodziyo, poyang'anira kuthamanga kwa flyer, chitsulo Kutsitsimutsa kwagalasi mofulumira "kumaundana" pamagulu osiyanasiyana.
Ochita kafukufuku achita kafukufuku wambiri pa ndondomeko yowonongeka kwambiri ya galasi lazitsulo kuchokera kumaganizo a thermodynamics, mawonekedwe amitundu yambiri ndi ma phonon dynamics "Bose peak", kuwulula kuti kubwezeretsedwa kwa magalasi a galasi kumachokera kumagulu a nano-scale.Voliyumu yaulere yopangidwa ndi "shear transition" mode.Kutengera ndi kachitidwe ka thupi kameneka, nambala ya Deborah yopanda dimension imatanthauzidwa, yomwe imafotokoza kuthekera kwanthawi yayitali yotsitsimutsanso magalasi azitsulo.Ntchitoyi yawonjezera nthawi ya kukonzanso magalasi azitsulo ndi maulamuliro osachepera 10, kukulitsa minda yogwiritsira ntchito zinthu zamtundu uwu, ndikukulitsa kumvetsetsa kwa anthu pa mphamvu ya galasi ya ultrafast.
Nthawi yotumiza: Dec-06-2021