The yield stress (ty), the microhardness (H) and the dislocation niobility in the stress field of a concentrated load ( y ) were measured in NaC1:Ca and NaC1:Pb single crystals within the temperature interval 77 -673 K. It was shown t h a t there was a good correlation betwreii the concentration changes o f r y , H and y for NaC1:Ca crystals. Such clrar results wrrc aI)se.nt, for NaC'l: P1) singlc c.rystals. An tmornaly of T~ a t 7 7 K was revealed for these c ~y s t a l s ; it was not followetl 1)s Llir H ariotiialy. I n conclusion it was stated t h a t the irnpnrity hardening was connected with the increasing of dislocation mobility but such a parameter did not determine the temperature hardening.
B MoeoKpncTannax NaC1:Ca
A NaC1:Pb npn TeMnepaTypax 77-673 Ic m ~e p e ~b ~ ripmemi2 cocpezoToYeHHo2 ~a r p y 3 1 ~ ( y ) . n o ~a a a a o YTo B IcpmTannax NaC1:Ca rIpeHeJI TeHyYeCTA(tTeH), MHKPOTBePAOCTL ( H ) A IIOjlBHHCHOCTb jlACJIOKaIPI2 B IIOJIe Ha-CyIUeCTByeT XOpOLIIaH IiOppeJIRUAR MeEZAy KOHI[eHTpaUHOHHbIMA T T ~E C , H A y . AJIR MOHO-IipACTaJInOB NaCl :Pb TaICMe YeTKAe pe3yJIbTaTbI OTCYTCTBYIoT. AJIR IIOCJIeAHHX o 6 ~a -YTO yIIpOYHf3HHe IIpAMeCRMA CBR3aHO C yMeHbIIIeHHeM IIOHBAWHOCTH AHCJIOIEaQAfi, a TeM-nepaTypHOL3 ynp0YHeHHe He OIlpeAeJIReTCH 3TAMR IIaTaMeTpaMA. pymeaa aHoManm tTeK n p ~ 77 H, He ConpoBox~am~ancR aHoManmeii H . CnenaH BbmoA, Y U . s. B O Y A R S K A Y -4 e t al. deformation temperature varied from 7 7 t o 673 K. Microhardness ( H ) nie&siirenients were performed on a cleavage plane < l o o > IJY using the ~nicrtiharciness tester PMT-3. Thr rlislocation mobility was studies in a norr-uriiforrn stress field arising in the indentation. The length of the dislocation iosette arm ( I ) or the paranieter y = Z/d (d is the size of the indentation diagonal) were taken as the characteristics of the dislocation Inobility. The use of the parameter y instead of Z is especially reasonalJle for the case when the dislocation mohilities of the crystals having essentieally different hardness are compared.