The kinetics of an A1 polycrystal sub-structure in creep has been examined for high stresses and medium temperatures. The cell structure has been studied by electron microscopy, microbeam and small-angle X-ray scattering methods. It is found that the dislocation density within the sub-boundaries at the stationary creep stage remains constant and the sub-boundaries are destructed, which leads to the growth of sub-grains. Possible mechanisms controlling destruction and creep are discussed. HccnenosaHa KmeTxrca (POPMEIPOBaHHR c y 6 c~p y~~y p b i B nonmpmxannmec-KOM aJlH)MHHUEI npEI IIOJl3yqeCTH IIpH 3HaqHTeJlbHhIX HaIIpaHCeHEIHX EI CpeHHEl X TeMIlepaTypaX. &IOWIaH CTpYHTYpa U3JTanaCb MeTOHOM 3JIeHTpOHHOfi MEIKPOC-K O~I I A , Mmponywa EI ManoyrnoBoro paccemm peHTreHoBcmx nyseit. IIony-'Ieno, w o nnoTHocTb AHcno~auHtt B rpaaasax 6 n o~a B TeqeaHe cTanua c-raunoaap-HOW non3yqec~n ocTaeTcH IIOCTOHHHO~~, a Bnosa~e rpamubI no Mepe HaKonneam MaTepHanoM nnacTwiecKot4 He(PopMaumi p a~~p y r u a m~c~, wo ~P H B O A I I T H ysenme-HEIH) paa~epa Bnorca. 06cyrn~ae~cfi B O I I~O C o BOBMOHCKHOM M~X~H E I~M~ pa3pyrueau~ II non3ysecTEI.

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