In honour of Professor V. I. STARTSEV'S 70th birthday
The authors experimentally revealed the existence of the temperature-strain rate region of jumplike deformation in Cu + 14 at.% A1 single crystals between 4.2 and 25 K. For each particular temperature in this temperature range, there are a lower and an upper critical strain rates, between which deformation is jumplike. The character of transients occurring during strain rate variation was investigated by increasing the strain rate t o the lower critical value. The experimental data are explained in terms of the thermomechanical instability concept and inertial effects of the sample-machine system. 3KCnepHMeHTaJIbHO 06HapyWeHO CYUeCTBOBaHEze TeMIIepaTypHO-CKOPOCTHOfi o 6 n a c ~~ IIpORBJIeHHR c ~a s ~o o 6 p a 3 ~o f i Ae@OpMaUHH AJIR MOHOKPHCTaJIJIOB CU -14 aT.% A1 B EzHTepBaJIe TeMnepaTyp 4.2-25 K. XJIFI KaWAOfi @HKCHPOBaHHOfi TeMIIepaTypbI B yKa-3BHHOM HHTepBaJIe Cy~eCTByIoT nBe KpHTEzYeCKHe CKOPOCTH ne@OpMHpOBaHHR, MeXAy IIpH UHKJIHpOBaHHH CHOPOCTH Ae@OpMHpOBaHHR B XOAe YBeJIHYeHHH ee A 0 HHWHefi KPH-TEzYeCKOfi. nOJIyYeHHbIe 3KCIIepHMeHTaJIbHbIe ABHHbIe 06' bRCHRIoTCR KOHUenUHefi Tep-MOMeXaHHYeCKOfi HeCTa6HJIbHOCTH Ez npORBJIeHHeM HHePUWOHHbIX 3@@eKTOB B CEzCTeMe KoTopbIMEz Ae@opMaqm CKaYKOO6pa3Ha. I.Isyse~ xapamep nepexommx npoueccos oBp a 3 e ~-~a u r u ~a .